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2013 Vol. 43, No. 3
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2013, 43(3): 1-7.
doi: 10.13204/j.gyjz201303001
Abstract:
The static performance of the axially compressed high-performance concrete filled steel tubular stub columns was investigated in order to provide foundation for drawing the relative code of Liaoning Province.On the basis of experimental study on 18 specimens(the cubic compressive strength of the in-filled self-consolidating concrete was 96 MPa),the deformed modes of the specimens were studied,it was found that the concrete showed good plastic property and the specimen failure was due to strength loss.The axial load-steel tube longitudinal strain curves were analyzed,it was found that it could be divided into elastic,elasto-plastic and softening stages.The axial load-steel tube longitudinal strain curves were simulated by using FEM and the calculated results checked well with those of tests.
The static performance of the axially compressed high-performance concrete filled steel tubular stub columns was investigated in order to provide foundation for drawing the relative code of Liaoning Province.On the basis of experimental study on 18 specimens(the cubic compressive strength of the in-filled self-consolidating concrete was 96 MPa),the deformed modes of the specimens were studied,it was found that the concrete showed good plastic property and the specimen failure was due to strength loss.The axial load-steel tube longitudinal strain curves were analyzed,it was found that it could be divided into elastic,elasto-plastic and softening stages.The axial load-steel tube longitudinal strain curves were simulated by using FEM and the calculated results checked well with those of tests.
2013, 43(3): 8-12.
doi: 10.13204/j.gyjz201303002
Abstract:
Distributions of stresses and strains of steel tube and concrete for high-performance concrete filled steel tubular stub column were investigated,it was found that longitudinal stress of concrete at mid-height cross-section distributed uniformly around the circumferential direction for the circular specimen,while longitudinal stress of concrete at mid-height cross-section located at corners was the biggest one for the square specimen.During loading process,steel tube at mid-height cross-section yielded firstly and then yield region developed gradually toward the two ends of the specimen.Analysis results of the typical calculations indicated that the circular steel tube could provide better confinement for concrete than the square steel tube,also,the circular steel tube confine the concrete uniformly around the circumferential direction while the confinement forces located at corners were the biggest ones for the square specimen.All of the specimens had the biggest confinement forces at the mid-height cross-section.Adhesive strength had little influence on the load bearing capacity of the specimens.Calculation formula of load bearing capacity for the normal concrete filled steel tubular stub column is also suitable for the high-performance concrete filled steel tubular stub column.There are no essential differences between the high-performance concrete filled steel tubular stub column and the normal concrete filled steel tubular stub column in aspect of static performance.
Distributions of stresses and strains of steel tube and concrete for high-performance concrete filled steel tubular stub column were investigated,it was found that longitudinal stress of concrete at mid-height cross-section distributed uniformly around the circumferential direction for the circular specimen,while longitudinal stress of concrete at mid-height cross-section located at corners was the biggest one for the square specimen.During loading process,steel tube at mid-height cross-section yielded firstly and then yield region developed gradually toward the two ends of the specimen.Analysis results of the typical calculations indicated that the circular steel tube could provide better confinement for concrete than the square steel tube,also,the circular steel tube confine the concrete uniformly around the circumferential direction while the confinement forces located at corners were the biggest ones for the square specimen.All of the specimens had the biggest confinement forces at the mid-height cross-section.Adhesive strength had little influence on the load bearing capacity of the specimens.Calculation formula of load bearing capacity for the normal concrete filled steel tubular stub column is also suitable for the high-performance concrete filled steel tubular stub column.There are no essential differences between the high-performance concrete filled steel tubular stub column and the normal concrete filled steel tubular stub column in aspect of static performance.
2013, 43(3): 13-17,29.
doi: 10.13204/j.gyjz201303003
Abstract:
The static performance of the high-performance concrete filled steel tubular flexural members were investigated in order to provide foundation for drawing the relative code of Liaoning Province.On the basis of experimental study on 18 specimens(the cubic compressive strength of the in-filled self-consolidating concrete was 96 MPa),it was found that the mid-span moment-curvature curves could be divided into elastic,elasto-plastic and softening stages.The deflection curve was close to sine curve,distribution of longitudinal strain of the steel tube obeyed the plane section assumption,also,the transversely compressed steel tube had no confinement force to the concrete.The mid-span moment-curvature curves and the deformed models were simulated by using FEM and the calculated results checked well with those of tests.In general,there are no essential differences between high-performance concrete filled steel tubular flexural member and normal concrete filled steel tubular flexural member in aspect of static performance.
The static performance of the high-performance concrete filled steel tubular flexural members were investigated in order to provide foundation for drawing the relative code of Liaoning Province.On the basis of experimental study on 18 specimens(the cubic compressive strength of the in-filled self-consolidating concrete was 96 MPa),it was found that the mid-span moment-curvature curves could be divided into elastic,elasto-plastic and softening stages.The deflection curve was close to sine curve,distribution of longitudinal strain of the steel tube obeyed the plane section assumption,also,the transversely compressed steel tube had no confinement force to the concrete.The mid-span moment-curvature curves and the deformed models were simulated by using FEM and the calculated results checked well with those of tests.In general,there are no essential differences between high-performance concrete filled steel tubular flexural member and normal concrete filled steel tubular flexural member in aspect of static performance.
2013, 43(3): 18-23.
doi: 10.13204/j.gyjz201303004
Abstract:
Distributions of stresses and strains of steel tube and concrete for high-performance concrete filled steel tubular flexural members were investigated.Study on interaction forces between steel tube and concrete indicated that the circular steel tube could provide better confinement than the square steel tube,while the interaction forces located at corners were the biggest ones for the square specimens.Adhesive strength had little influence on the moment-curvature curves of the specimens.Calculation formula of load bearing capacity for the normal concrete filled steel tubular flexural member is also suitable for the high-performance concrete filled steel tubular flexural members.There are no essential differences between the high-performance concrete filled steel tubular flexural members and the normal concrete filled steel tubular flexural members in aspect of static performance.
Distributions of stresses and strains of steel tube and concrete for high-performance concrete filled steel tubular flexural members were investigated.Study on interaction forces between steel tube and concrete indicated that the circular steel tube could provide better confinement than the square steel tube,while the interaction forces located at corners were the biggest ones for the square specimens.Adhesive strength had little influence on the moment-curvature curves of the specimens.Calculation formula of load bearing capacity for the normal concrete filled steel tubular flexural member is also suitable for the high-performance concrete filled steel tubular flexural members.There are no essential differences between the high-performance concrete filled steel tubular flexural members and the normal concrete filled steel tubular flexural members in aspect of static performance.
2013, 43(3): 24-29.
doi: 10.13204/j.gyjz201303005
Abstract:
The static performance of the high-performance concrete filled steel tubular beam-columns were investigated in order to provide foundation for drawing the relative code of Liaoning Province.On the basis of experimental study on 18 specimens(the cubic compressive strength of the in-filled self-consolidating concrete was 96 MPa),it was found that the axial load-deflection curves could be divided into elastic,elasto-plastic and softening stages.The deflection curve was close to sine curve,distribution of longitudinal strain of the steel tube obeyed the plane section assumption,also,the transversely compressed steel tube had no confinement force to the concrete.The axial load-deflection curves and the deformed models were simulated by using FEM and the calculated results checked well with those of tests.In general,there are no essential differences between high-performance concrete filled steel tubular beam-column and normal concrete filled steel tubular beam-column in aspect of static performance.
The static performance of the high-performance concrete filled steel tubular beam-columns were investigated in order to provide foundation for drawing the relative code of Liaoning Province.On the basis of experimental study on 18 specimens(the cubic compressive strength of the in-filled self-consolidating concrete was 96 MPa),it was found that the axial load-deflection curves could be divided into elastic,elasto-plastic and softening stages.The deflection curve was close to sine curve,distribution of longitudinal strain of the steel tube obeyed the plane section assumption,also,the transversely compressed steel tube had no confinement force to the concrete.The axial load-deflection curves and the deformed models were simulated by using FEM and the calculated results checked well with those of tests.In general,there are no essential differences between high-performance concrete filled steel tubular beam-column and normal concrete filled steel tubular beam-column in aspect of static performance.
2013, 43(3): 30-35,7.
doi: 10.13204/j.gyjz201303006
Abstract:
Distributions of stresses and strains of steel tube and concrete for high-performance concrete filled steel tubular beam-column were investigated.Study on interaction forces between steel tube and concrete indicated that confinement force located at compressive region was bigger than other locations for circular specimens,while the interaction force located at corners were the biggest ones for the square specimens.All of the specimens had the biggest interaction forces on the compressive region at the mid-height cross-section.Adhesive strength and loading path had little influence on the static performances of the specimens.Calculation formula of load bearing capacity for the normal concrete filled steel tubular beam-column is also suitable for the high-performance concrete filled steel tubular beam-columns.There are no essential differences between the high-performance concrete filled steel tubular beam-columns and the normal concrete filled steel tubular beam-columns in aspect of static performance.
Distributions of stresses and strains of steel tube and concrete for high-performance concrete filled steel tubular beam-column were investigated.Study on interaction forces between steel tube and concrete indicated that confinement force located at compressive region was bigger than other locations for circular specimens,while the interaction force located at corners were the biggest ones for the square specimens.All of the specimens had the biggest interaction forces on the compressive region at the mid-height cross-section.Adhesive strength and loading path had little influence on the static performances of the specimens.Calculation formula of load bearing capacity for the normal concrete filled steel tubular beam-column is also suitable for the high-performance concrete filled steel tubular beam-columns.There are no essential differences between the high-performance concrete filled steel tubular beam-columns and the normal concrete filled steel tubular beam-columns in aspect of static performance.
2013, 43(3): 36-39,107.
doi: 10.13204/j.gyjz201303007
Abstract:
The industrial heritage is a very unique cultural resources,it is equally important significance in its reuse and protection.Reuse of industrial heritage takes many forms,in recent years planning and construction of a cultural and creative industrial park is the most common practice.The construction of the cultural and creative industrial parks is conducive to the concentration protection,unified planning and management of industrial heritages and also to the formation and development of the cultural and creative industries cluster.Taking the Guangzhou Redtory Area Culture Creative Industry Park for example,it was explored the reuse,planning and design of a cultural and creative industrial park in the context of industrial heritage reuse,and the related thinking and suggestions were proposed.
The industrial heritage is a very unique cultural resources,it is equally important significance in its reuse and protection.Reuse of industrial heritage takes many forms,in recent years planning and construction of a cultural and creative industrial park is the most common practice.The construction of the cultural and creative industrial parks is conducive to the concentration protection,unified planning and management of industrial heritages and also to the formation and development of the cultural and creative industries cluster.Taking the Guangzhou Redtory Area Culture Creative Industry Park for example,it was explored the reuse,planning and design of a cultural and creative industrial park in the context of industrial heritage reuse,and the related thinking and suggestions were proposed.
2013, 43(3): 40-43,51.
doi: 10.13204/j.gyjz201303008
Abstract:
Combined with the promotion and implementation of polices of three-old reforming.it was investigated how to plan,design and improve the land-use-efficiency,as well as expand the space,improve facilities and beautify the campus environment for modern companies.Meanwhile,it was also studied the ways to reflect the corporate image and characteristics of the times in industrial building design.Then combined with the low-carbon idea,it was done a research on do thinks about the transformation of old buildings.
Combined with the promotion and implementation of polices of three-old reforming.it was investigated how to plan,design and improve the land-use-efficiency,as well as expand the space,improve facilities and beautify the campus environment for modern companies.Meanwhile,it was also studied the ways to reflect the corporate image and characteristics of the times in industrial building design.Then combined with the low-carbon idea,it was done a research on do thinks about the transformation of old buildings.
2013, 43(3): 44-47,23.
doi: 10.13204/j.gyjz201303009
Abstract:
As one of the key parts of a construction,roof form is considered to be of great importance to design of buildings.With the development of technology,material and aesthetics,the design of the roofs modern buildings has become much more characteristic and holistic.It was made a detailed research on the roof designing process of Xiangluowan CBD Project in Tianjin Coastal Area as to find the key points and scientific method of modern roof form designing.
As one of the key parts of a construction,roof form is considered to be of great importance to design of buildings.With the development of technology,material and aesthetics,the design of the roofs modern buildings has become much more characteristic and holistic.It was made a detailed research on the roof designing process of Xiangluowan CBD Project in Tianjin Coastal Area as to find the key points and scientific method of modern roof form designing.
2013, 43(3): 48-51.
doi: 10.13204/j.gyjz201303010
Abstract:
With the development of planting roof in China,its energy-saving research is promoted in depth.According to the comparison of typical cases of the planting roof energy-saving researches at home and abroad,it was discussed the research work in China.It was pointed out that for the planting roofs having a good energy-saving performance in summer,much attention should be paid to the energy-saving performance in winter in cold regions of northern China,and that the work of energy-saving research on green roofs is comprehensive and local.
With the development of planting roof in China,its energy-saving research is promoted in depth.According to the comparison of typical cases of the planting roof energy-saving researches at home and abroad,it was discussed the research work in China.It was pointed out that for the planting roofs having a good energy-saving performance in summer,much attention should be paid to the energy-saving performance in winter in cold regions of northern China,and that the work of energy-saving research on green roofs is comprehensive and local.
2013, 43(3): 52-56.
doi: 10.13204/j.gyjz201303011
Abstract:
Lead extrusion damper is widely used in the seismic control of structures for its large initial stiffness,high yield strength and good energy dissipation capacity.But as the lack of the research and analysis of the lead,there are more or less differences between the experiment results and the numerical simulation results of damper.A new style of lead extrusion damper was designed,called metal alloy brace(MAB).According to the result of the experiment study and using the finite element software DEFORM-3D some systemic research of this damper was done.Comparing and analyzing the experiment results and numerical simulation analysis results it concluded as follows: the MAB has an excellent energy dissipation capacity and can provide positive capacity when the structure meets larger earthquake;the size of the extrusion region,the height of the axon,the gap between axon and the cavity have significant effect on the energy dissipation capacity of the damper;during the analysis of the numerical simulation,the choice of mechanical model of lead has significant effect on the simulation result,and DEFORM-3D can be widely used in the numerical simulation analysis of metallic damper.
Lead extrusion damper is widely used in the seismic control of structures for its large initial stiffness,high yield strength and good energy dissipation capacity.But as the lack of the research and analysis of the lead,there are more or less differences between the experiment results and the numerical simulation results of damper.A new style of lead extrusion damper was designed,called metal alloy brace(MAB).According to the result of the experiment study and using the finite element software DEFORM-3D some systemic research of this damper was done.Comparing and analyzing the experiment results and numerical simulation analysis results it concluded as follows: the MAB has an excellent energy dissipation capacity and can provide positive capacity when the structure meets larger earthquake;the size of the extrusion region,the height of the axon,the gap between axon and the cavity have significant effect on the energy dissipation capacity of the damper;during the analysis of the numerical simulation,the choice of mechanical model of lead has significant effect on the simulation result,and DEFORM-3D can be widely used in the numerical simulation analysis of metallic damper.
2013, 43(3): 57-60,66.
doi: 10.13204/j.gyjz201303012
Abstract:
Based on 30 sets of acceleration records of near-field earthquake,the influence of vertical effect of near-field earthquake on the vertical and horizontal response spectra displacement demand of structures was studied in detail.Statistical analysis showed that for the selected acceleration records,the maximum value of the vertical mean spectra was higher than that of the horizontal mean spectra.Hence compared to the far-field earthquake,the near-field earthquake really had much higher vertical effect.Consulting the internal and overseas research results,the near-field standard design spectra were established adapting to Chinese seismic code.The results showed that after considering the near-field effect,the value of horizontal standard design spectra increased obviously in short-period,which was worth paying much attention by researchers and designers in the field of earthquake engineering.
Based on 30 sets of acceleration records of near-field earthquake,the influence of vertical effect of near-field earthquake on the vertical and horizontal response spectra displacement demand of structures was studied in detail.Statistical analysis showed that for the selected acceleration records,the maximum value of the vertical mean spectra was higher than that of the horizontal mean spectra.Hence compared to the far-field earthquake,the near-field earthquake really had much higher vertical effect.Consulting the internal and overseas research results,the near-field standard design spectra were established adapting to Chinese seismic code.The results showed that after considering the near-field effect,the value of horizontal standard design spectra increased obviously in short-period,which was worth paying much attention by researchers and designers in the field of earthquake engineering.
2013, 43(3): 61-66.
doi: 10.13204/j.gyjz201303013
Abstract:
A new set of compound masonry blocks that feature heat preservation has been designed and a new wall construction method has been proposed.Walls applied with this method have a heat-preserving layer on the outside of their ring beams and construction columns.Eight full-size concrete compound heat-preserving masonry walls were tested under low cyclic horizontal loadings.The earthquake resistant performance indicators of the wall,such as damage process,hysteresis features,ductility,energy dissipation and rigidity deterioration were studied.According to the experiments,the walls constructed by the new method are similar to the traditional walls in terms of failure mode,hysteresis features,ductility,energy dissipation and rigidity deterioration.
A new set of compound masonry blocks that feature heat preservation has been designed and a new wall construction method has been proposed.Walls applied with this method have a heat-preserving layer on the outside of their ring beams and construction columns.Eight full-size concrete compound heat-preserving masonry walls were tested under low cyclic horizontal loadings.The earthquake resistant performance indicators of the wall,such as damage process,hysteresis features,ductility,energy dissipation and rigidity deterioration were studied.According to the experiments,the walls constructed by the new method are similar to the traditional walls in terms of failure mode,hysteresis features,ductility,energy dissipation and rigidity deterioration.
2013, 43(3): 67-70.
doi: 10.13204/j.gyjz201303014
Abstract:
Based on the calculation and analysis of engineering examples by finite element structural software SATWE it was studied effects of layers and floor height in tall shear walls structure on quantity of shear walls,and obtained some reference suggestions.Usually when the design of tall shear walls structure it is tried to make the ratio of height to width being not greater than 4,which can control the cost of a building.The change of floor height has more significant impact than the change of layers in rigidity of shear-wall structure.When increasing the wall thickness of shear-wall to ensure the max-story drift under the same conditions,the increase in layers and floor height of structure will produce adverse effects on the overall stability and safety of the structure.
Based on the calculation and analysis of engineering examples by finite element structural software SATWE it was studied effects of layers and floor height in tall shear walls structure on quantity of shear walls,and obtained some reference suggestions.Usually when the design of tall shear walls structure it is tried to make the ratio of height to width being not greater than 4,which can control the cost of a building.The change of floor height has more significant impact than the change of layers in rigidity of shear-wall structure.When increasing the wall thickness of shear-wall to ensure the max-story drift under the same conditions,the increase in layers and floor height of structure will produce adverse effects on the overall stability and safety of the structure.
2013, 43(3): 71-74.
doi: 10.13204/j.gyjz201303015
Abstract:
Soil electrical resistivity is one of the fundamental physical property parameters of soil,and is closely related to the properties of physical,mechanical parameters and microstructure characteristics of soils.A systemic experimental study was carried out to study the effect of solid composition on soil electrical resistivity.A simple method was put forward to evaluate the conductivity of solid composition of soil.Based on the test results,the electrical resistivity of test expansive soil was got.Based on the test of the electrical resistivity of additives stabilized expansive soil,it was found that the electrical resistivity of stabilized expansive soils was increased with curing time.Test results of the electrical resistivity of the admixture of expansive soil and loess showed that soil electrical resistivity was decreased with the increase in liquid limit and plastic index.
Soil electrical resistivity is one of the fundamental physical property parameters of soil,and is closely related to the properties of physical,mechanical parameters and microstructure characteristics of soils.A systemic experimental study was carried out to study the effect of solid composition on soil electrical resistivity.A simple method was put forward to evaluate the conductivity of solid composition of soil.Based on the test results,the electrical resistivity of test expansive soil was got.Based on the test of the electrical resistivity of additives stabilized expansive soil,it was found that the electrical resistivity of stabilized expansive soils was increased with curing time.Test results of the electrical resistivity of the admixture of expansive soil and loess showed that soil electrical resistivity was decreased with the increase in liquid limit and plastic index.
2013, 43(3): 75-78.
doi: 10.13204/j.gyjz201303016
Abstract:
In order to analyze the influence of vertical stress of various loads that caused the rupture of vertical shaft wall in the deep alluvium,the vertical stress components in the shaft wall were analyzed,which were produced by the thermal effect,self-weight,level lateral pressure and vertical additional stress.It was shown that the vertical additional stress and thermal stress playped important roles to lead in the rupture of shaft.It was also shown that the vertical components of thermal stress became larger with increases of internal and external wall temperature difference.And with the increase of wall thickness,the vertical additional stress had a sharp decrease,while thermal stress no significant changes.
In order to analyze the influence of vertical stress of various loads that caused the rupture of vertical shaft wall in the deep alluvium,the vertical stress components in the shaft wall were analyzed,which were produced by the thermal effect,self-weight,level lateral pressure and vertical additional stress.It was shown that the vertical additional stress and thermal stress playped important roles to lead in the rupture of shaft.It was also shown that the vertical components of thermal stress became larger with increases of internal and external wall temperature difference.And with the increase of wall thickness,the vertical additional stress had a sharp decrease,while thermal stress no significant changes.
RESEARCH ON THE SECONDARY DEVELOPMENT OF ELASTO-PLASTIC CONSTITUTIVE MODEL IN STRAIN SPACE OF FLAC3D
2013, 43(3): 79-83,74.
doi: 10.13204/j.gyjz201303017
Abstract:
Based on the theory of strain space,the numerical computational scheme was proposed for Mohr-Coulomb constitutive relation,by using different plastic potential function(M-C associated criteria and D-P non-associated criteria),and the key technologies and concrete methods of implementation were explained.Through the secondary development platform UDM of FLAC3D,by using Visual Studio 2005 on the basis of UserMohr model,the dynamic link library file(DLL) of the constitutive model was compiled and the secondary development of elasto-plastic constitutive model in strain space was realized.Underground salt caverns static dissolved simulation validation examples were compared and analyzed.The results showed that the calculated results were almost consistent with the FLAC3D self-defined Mohr Coulomb constitutive model and the analytical solutions under the elastic-plastic conditions,which verified the validity of the software.The software could provide an alternative numerical simulation method for underground salt dissolved cavity simulation and long-term operation rheology.
Based on the theory of strain space,the numerical computational scheme was proposed for Mohr-Coulomb constitutive relation,by using different plastic potential function(M-C associated criteria and D-P non-associated criteria),and the key technologies and concrete methods of implementation were explained.Through the secondary development platform UDM of FLAC3D,by using Visual Studio 2005 on the basis of UserMohr model,the dynamic link library file(DLL) of the constitutive model was compiled and the secondary development of elasto-plastic constitutive model in strain space was realized.Underground salt caverns static dissolved simulation validation examples were compared and analyzed.The results showed that the calculated results were almost consistent with the FLAC3D self-defined Mohr Coulomb constitutive model and the analytical solutions under the elastic-plastic conditions,which verified the validity of the software.The software could provide an alternative numerical simulation method for underground salt dissolved cavity simulation and long-term operation rheology.
2013, 43(3): 84-87.
doi: 10.13204/j.gyjz201303018
Abstract:
The bond properties between basalt fiber concrete and deformed bar were researched.There were two kinds of fiber length,and four kinds of volume fraction.The plain concrete without basalt fiber was designed for comparison.The bond stress vs.slip curves were obtained by center pull-out test,and the test results indicated that when basalt fiber was added to concrete,the bond strength between basalt fiber concrete and deformed bar had the tendency of reduction,the corresponding slip of ultimate bond strength increased.Under the same volume fraction,the ultimate bond strength corresponding to 18 mm fiber was greater than the corresponding value of 6 mm fiber.While volume fraction of basalt fiber was controlled reasonably,the effects of adding basalt fiber on bond strength could be reduced.In addition,the formula of ultimate bond strength was obtained by analyzing the data.
The bond properties between basalt fiber concrete and deformed bar were researched.There were two kinds of fiber length,and four kinds of volume fraction.The plain concrete without basalt fiber was designed for comparison.The bond stress vs.slip curves were obtained by center pull-out test,and the test results indicated that when basalt fiber was added to concrete,the bond strength between basalt fiber concrete and deformed bar had the tendency of reduction,the corresponding slip of ultimate bond strength increased.Under the same volume fraction,the ultimate bond strength corresponding to 18 mm fiber was greater than the corresponding value of 6 mm fiber.While volume fraction of basalt fiber was controlled reasonably,the effects of adding basalt fiber on bond strength could be reduced.In addition,the formula of ultimate bond strength was obtained by analyzing the data.
2013, 43(3): 88-92,155.
doi: 10.13204/j.gyjz201303019
Abstract:
By using fly ash,slag powder,limestone powder and silica fume,high performance self-compacting concrete for marine structure was developed and the shrinkage of high performance self-compacting concrete for marine structure was emphatically studied.Experimental results show that the 7 d hydration heat of binder material for six kinds of high performance self-compacting concrete for marine structure is less than 238 J/g,and 7 d adiabatic temperature rise for six kinds of high performance self-compacting concrete for marine structure isn't greater than 55 ℃.The making up method with composite mineral admixture is feasible to improve crack resistance of mass concrete.Moreover,the effect with fly and slag powder,and slag powder and limestone powder is best,7 d adiabatic temperature rise of them can be controlled in 50 ℃.
By using fly ash,slag powder,limestone powder and silica fume,high performance self-compacting concrete for marine structure was developed and the shrinkage of high performance self-compacting concrete for marine structure was emphatically studied.Experimental results show that the 7 d hydration heat of binder material for six kinds of high performance self-compacting concrete for marine structure is less than 238 J/g,and 7 d adiabatic temperature rise for six kinds of high performance self-compacting concrete for marine structure isn't greater than 55 ℃.The making up method with composite mineral admixture is feasible to improve crack resistance of mass concrete.Moreover,the effect with fly and slag powder,and slag powder and limestone powder is best,7 d adiabatic temperature rise of them can be controlled in 50 ℃.
2013, 43(3): 93-96.
doi: 10.13204/j.gyjz201303020
Abstract:
The raw materials used in Urumqi area were used to prepare C30 self-compacting concrete,nine sets of tests were done by the method of orthogonal experiment,it was analysed the effect of the blending quantity of the mineral,water cement ratio,sand ratio,amount of admixture on the workability and strength of self-compacting concrete.Based on which optimization adjustment was made,and finally the C30 self-compacting concrete mixture ratio suitable for Urumqi regions was got.
The raw materials used in Urumqi area were used to prepare C30 self-compacting concrete,nine sets of tests were done by the method of orthogonal experiment,it was analysed the effect of the blending quantity of the mineral,water cement ratio,sand ratio,amount of admixture on the workability and strength of self-compacting concrete.Based on which optimization adjustment was made,and finally the C30 self-compacting concrete mixture ratio suitable for Urumqi regions was got.
2013, 43(3): 97-102.
doi: 10.13204/j.gyjz201303021
Abstract:
The bolt connection joint of steel tubular scaffold with couplers is a kind of typical semi-stiffness connection;the stiffness is directly related to the tightening moment.The innovative lateral resistance of whole frame was designed based on the objective parameter displacement back analysis and different from the regular stiffness test of single joint.The relationship between the node lateral displacement and the top level force was got by the test.The joint rotation stiffness considering the structural factors was gained through the analysis of the experimental data and the finite element analysis,which provided the reliable key mechanical parameter for ultimate strength analysis of the whole frame.
The bolt connection joint of steel tubular scaffold with couplers is a kind of typical semi-stiffness connection;the stiffness is directly related to the tightening moment.The innovative lateral resistance of whole frame was designed based on the objective parameter displacement back analysis and different from the regular stiffness test of single joint.The relationship between the node lateral displacement and the top level force was got by the test.The joint rotation stiffness considering the structural factors was gained through the analysis of the experimental data and the finite element analysis,which provided the reliable key mechanical parameter for ultimate strength analysis of the whole frame.
2013, 43(3): 103-107.
doi: 10.13204/j.gyjz201303022
Abstract:
To explore the reasonable form of underpinning frame in the building relocation by sliding,ANSYS software was used to build a model of frame structure building moved by sliding,and then compared impact of eight different forms of underpinning frame on building deformation and stress while optimizing section dimension of diagonal bracing,thus a more reasonable underpinning frame was given.The results showed that the underpinning frame 6 had characteristics of small deformation,good stress state and simple structure,which was recommended to be the first available underpinning frame form.Optimized the section size of bracing could be reduced to 50% of its original size within the selected reasonable displacement and safe stress,while the deformation and stress state were perfect.
To explore the reasonable form of underpinning frame in the building relocation by sliding,ANSYS software was used to build a model of frame structure building moved by sliding,and then compared impact of eight different forms of underpinning frame on building deformation and stress while optimizing section dimension of diagonal bracing,thus a more reasonable underpinning frame was given.The results showed that the underpinning frame 6 had characteristics of small deformation,good stress state and simple structure,which was recommended to be the first available underpinning frame form.Optimized the section size of bracing could be reduced to 50% of its original size within the selected reasonable displacement and safe stress,while the deformation and stress state were perfect.
2013, 43(3): 108-112.
doi: 10.13204/j.gyjz201303023
Abstract:
The combined connection with welds and bolds can be widely used in reinforcing the joint in steel structure.In this paper,a proposed design method of combined connection with bolts and longitudinal welds was given based on the tests and finite element analysis(FEA).The was method considers the effect of the strength ratio between bolts and welds.The safety and reliability of the method were verified by FEA and also compared with other design method.The design method can contribute to the promotion of the application of the combined connections.
The combined connection with welds and bolds can be widely used in reinforcing the joint in steel structure.In this paper,a proposed design method of combined connection with bolts and longitudinal welds was given based on the tests and finite element analysis(FEA).The was method considers the effect of the strength ratio between bolts and welds.The safety and reliability of the method were verified by FEA and also compared with other design method.The design method can contribute to the promotion of the application of the combined connections.
2013, 43(3): 113-119.
doi: 10.13204/j.gyjz201303024
Abstract:
A direct welding connection way is usually used for the thin-walled steel tube beam-column joint,it will lead to a brittle fracture in the joint region and also reduce the node plastic deformation ability.Based on the way of scattering the welding,and reduce the welding number of column,a new connection way was proposed.It was contrasted XJD node with JD node through experiment.It was examined XJD's characteristics by the damage way of node,hysteretic energy and ductility.It was also studied the changes of geometric parameter that affect mechanical property through finite element model.The results show that from the experimental study,it can be found that the XJD node has less bearing capacity,but has more ductility and energy dissipation capacity than the JD node.In the parametric analysis,the thickness of the square steel tube column and the C-shaped steel beam has less affect on the shape of hysteresis curve,but the bearing capacity,initial stiffness and the energy dissipation are increased with the increase of these values.The change in thickness of the square steel tube beam has less affect on the node hysteresis curve and the bearing capacity,but has greater impact on the value of the initial stiffness.The changes of the C-shaped steel beam and the relative position of the square steel tube beam and C-shaped steel beam have a significant impact on hysteresis curve,carrying capacity and the initial stiffness.It can also change the pinching of the hysteresis curve.
A direct welding connection way is usually used for the thin-walled steel tube beam-column joint,it will lead to a brittle fracture in the joint region and also reduce the node plastic deformation ability.Based on the way of scattering the welding,and reduce the welding number of column,a new connection way was proposed.It was contrasted XJD node with JD node through experiment.It was examined XJD's characteristics by the damage way of node,hysteretic energy and ductility.It was also studied the changes of geometric parameter that affect mechanical property through finite element model.The results show that from the experimental study,it can be found that the XJD node has less bearing capacity,but has more ductility and energy dissipation capacity than the JD node.In the parametric analysis,the thickness of the square steel tube column and the C-shaped steel beam has less affect on the shape of hysteresis curve,but the bearing capacity,initial stiffness and the energy dissipation are increased with the increase of these values.The change in thickness of the square steel tube beam has less affect on the node hysteresis curve and the bearing capacity,but has greater impact on the value of the initial stiffness.The changes of the C-shaped steel beam and the relative position of the square steel tube beam and C-shaped steel beam have a significant impact on hysteresis curve,carrying capacity and the initial stiffness.It can also change the pinching of the hysteresis curve.
2013, 43(3): 120-124.
doi: 10.13204/j.gyjz201303025
Abstract:
For studying failure mode and structural anti-seismic performance of the original mega steel frame-cable bracing structure,the pushover analysis was applied by two different lateral loading patterns of inverted triangle and uniform distribution in this paper.The calculation results show that failure mode is basically the same in the two lateral load patterns.The failure order of members is braces between columns,web rods of mega beam,floor beams,chord rods of mega beam,and column piers.Cable fails earlier,the tension of another cable in the same story increases faster.In 8 degree frequent earthquake,the structure is in the elastic state,and in 8 degree rare earthquake,parts of the structural members enter into plastic state.All the inter-story drifts meet the seismic requirements under the action of 8 degree frequent earthquake and rare earthquake.
For studying failure mode and structural anti-seismic performance of the original mega steel frame-cable bracing structure,the pushover analysis was applied by two different lateral loading patterns of inverted triangle and uniform distribution in this paper.The calculation results show that failure mode is basically the same in the two lateral load patterns.The failure order of members is braces between columns,web rods of mega beam,floor beams,chord rods of mega beam,and column piers.Cable fails earlier,the tension of another cable in the same story increases faster.In 8 degree frequent earthquake,the structure is in the elastic state,and in 8 degree rare earthquake,parts of the structural members enter into plastic state.All the inter-story drifts meet the seismic requirements under the action of 8 degree frequent earthquake and rare earthquake.
2013, 43(3): 125-128.
doi: 10.13204/j.gyjz201303026
Abstract:
Pseudo-static test of four walls with aspect ratio of 0.7 and 1.75 was carried out to study the improvement of seismic performance of sided latticed steel plate reinforced brick masonry wall,the wall failure characteristics and bearing capacity and deformation properties.Of which 2 walls were the reference ones,and the other two were sided lattice steel plate reinforced walls.The experimental results showed that the bearing capacity of side latticed steel plate reinforced brick wall of 0.7 aspect ratio increased by about 50%,basically no increase in wall bearing capacity of 1.75 aspect ratio,the deformation properties of reinforced wall were greatly improved.
Pseudo-static test of four walls with aspect ratio of 0.7 and 1.75 was carried out to study the improvement of seismic performance of sided latticed steel plate reinforced brick masonry wall,the wall failure characteristics and bearing capacity and deformation properties.Of which 2 walls were the reference ones,and the other two were sided lattice steel plate reinforced walls.The experimental results showed that the bearing capacity of side latticed steel plate reinforced brick wall of 0.7 aspect ratio increased by about 50%,basically no increase in wall bearing capacity of 1.75 aspect ratio,the deformation properties of reinforced wall were greatly improved.
2013, 43(3): 129-132,78.
doi: 10.13204/j.gyjz201303027
Abstract:
Buckling-restrained-brace(BRB) shows the same load deformation behavior in both compression and tension,it can be both a lateral force resistant and energy dissipation component.Based on the characteristics of school building and BRB mechanical behavior,the appliction of BRBs were introduced in retrofitting the irregular classroom building.Comparative study of the building information before and after retrofitting were done by response spectrum analysis and nonlinear time history analysis.Results showed that BRBs could adjust the torsional and lateral stiffness of original structure when subjected to frequent earthquakes,and when subjected to strong earthquakes,BRBs yielded and provided additional energy dissipation capacity for the main structure.So that evident effect of retrofitting was got.
Buckling-restrained-brace(BRB) shows the same load deformation behavior in both compression and tension,it can be both a lateral force resistant and energy dissipation component.Based on the characteristics of school building and BRB mechanical behavior,the appliction of BRBs were introduced in retrofitting the irregular classroom building.Comparative study of the building information before and after retrofitting were done by response spectrum analysis and nonlinear time history analysis.Results showed that BRBs could adjust the torsional and lateral stiffness of original structure when subjected to frequent earthquakes,and when subjected to strong earthquakes,BRBs yielded and provided additional energy dissipation capacity for the main structure.So that evident effect of retrofitting was got.
2013, 43(3): 133-137.
doi: 10.13204/j.gyjz201303028
Abstract:
For the converter's high-rise frame of the large main furnace building,its structural system is very complex.So it's very difficult to reinforce it.Combined a steel mill building,it was researched its loading,structure model,the reason of crack,reinforcement feasibility.With the determination of the bracing frame's relative strength index,the reasonable structure model was provided to reduce the reinforcement quantity.It was also research the maximum value of nominal stress under loading and welding,regular production was assured according to appropriate unloading.According to different calculation results and current conditions,different reinforcement design methods for the high-rise frame were introduced.The reinforcement results were very good.Which provided a useful reference for other similar projects.
For the converter's high-rise frame of the large main furnace building,its structural system is very complex.So it's very difficult to reinforce it.Combined a steel mill building,it was researched its loading,structure model,the reason of crack,reinforcement feasibility.With the determination of the bracing frame's relative strength index,the reasonable structure model was provided to reduce the reinforcement quantity.It was also research the maximum value of nominal stress under loading and welding,regular production was assured according to appropriate unloading.According to different calculation results and current conditions,different reinforcement design methods for the high-rise frame were introduced.The reinforcement results were very good.Which provided a useful reference for other similar projects.
2013, 43(3): 138-141,124.
doi: 10.13204/j.gyjz201303029
Abstract:
Belt transport corridor is an industrial building in the more common structure form.Along with the increase of the service time,there are many problems in the steel truss,such as corrosion damage,deformation etc.On the basis of a belt transport corridor steel truss structure inspection,it was found out the dangerous points,and pointed out that this kind of structure in use could face the problems.Combined with the actual problem,the paper put forward the reinforcement scheme.
Belt transport corridor is an industrial building in the more common structure form.Along with the increase of the service time,there are many problems in the steel truss,such as corrosion damage,deformation etc.On the basis of a belt transport corridor steel truss structure inspection,it was found out the dangerous points,and pointed out that this kind of structure in use could face the problems.Combined with the actual problem,the paper put forward the reinforcement scheme.
2013, 43(3): 142-146.
doi: 10.13204/j.gyjz201303030
Abstract:
A super high-rise building was located in Jiangyin with a height of 243 m.It was adopted the frame-corewall structural system and pile raft foundation.The main building,podium and pure basement were connected together underground without any deformation joint,which leaded to an enlarged base.Therefore,optimized design of pile foundation stiffness,post grouting for cast-in-situ pile and post-pouring belt were used in the project for controlling differential settlement.The structure characteristics were briefly introduced,where the foundation design based on the structural arrangement and geological data were elaborated.An optimized design of pile foundation stiffness to reduce differential settlement was emphatically introduced.
A super high-rise building was located in Jiangyin with a height of 243 m.It was adopted the frame-corewall structural system and pile raft foundation.The main building,podium and pure basement were connected together underground without any deformation joint,which leaded to an enlarged base.Therefore,optimized design of pile foundation stiffness,post grouting for cast-in-situ pile and post-pouring belt were used in the project for controlling differential settlement.The structure characteristics were briefly introduced,where the foundation design based on the structural arrangement and geological data were elaborated.An optimized design of pile foundation stiffness to reduce differential settlement was emphatically introduced.
2013, 43(3): 147-152.
doi: 10.13204/j.gyjz201303031
Abstract:
Based on the design of a 442 m-long multifunctional corridor in an automobile manufactory,it was discussed the form selection and the mechanical behavior of the large-span steel truss of multiple-story which was applicable in such complex industrial corridor.The results show that the mechanical behavior of multi-span truss is similar to continuous beam in vertical load,which is mainly resisted by the the axial force of web member and chord.The hinge joint between column and chord is suitable for truss,and the stress and deformation of chord in the side direction wind load can't be ignored.
Based on the design of a 442 m-long multifunctional corridor in an automobile manufactory,it was discussed the form selection and the mechanical behavior of the large-span steel truss of multiple-story which was applicable in such complex industrial corridor.The results show that the mechanical behavior of multi-span truss is similar to continuous beam in vertical load,which is mainly resisted by the the axial force of web member and chord.The hinge joint between column and chord is suitable for truss,and the stress and deformation of chord in the side direction wind load can't be ignored.
2013, 43(3): 153-155.
doi: 10.13204/j.gyjz201303032
Abstract:
Taking the project of Guangzhou Grain Reserve Processing Center for example,and by means of study on facade treetment of industrial buildings for grain reserve and processing,it was explored the possibilities for strengthening enterprise images in the design of industrial building facades,by which the enterprise images could be applied to the design of industrial building facades through artistic expression,thus it was proposed the attitude that should be held in the creation of an industrial building.
Taking the project of Guangzhou Grain Reserve Processing Center for example,and by means of study on facade treetment of industrial buildings for grain reserve and processing,it was explored the possibilities for strengthening enterprise images in the design of industrial building facades,by which the enterprise images could be applied to the design of industrial building facades through artistic expression,thus it was proposed the attitude that should be held in the creation of an industrial building.
2013, 43(3): 156-158.
doi: 10.13204/j.gyjz201303033
Abstract:
It was launched a discussion on conception,style of Yongchang County Cultural Center;coordination with Gelaofu building in the same base and architectural function to meet the requirements of designs.It was also presented the schemes of planning and design that could solve all the problems in a better way.It was expected to provide some reference for the design of similar public cultural buildings.
It was launched a discussion on conception,style of Yongchang County Cultural Center;coordination with Gelaofu building in the same base and architectural function to meet the requirements of designs.It was also presented the schemes of planning and design that could solve all the problems in a better way.It was expected to provide some reference for the design of similar public cultural buildings.
