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2009 Vol. 39, No. 4
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2009, 39(4): 1-4.
doi: 10.13204/j.gyjz200904001
Abstract:
Behaviour of concrete-filled square stiffened thin-walled steel tubular columns under eccentric loading is investigated using ABAQUS software.The model prediction results are in good agreement with the test results.The effects of stiffening on the performance of thin-walled composite columns are then discussed.
Behaviour of concrete-filled square stiffened thin-walled steel tubular columns under eccentric loading is investigated using ABAQUS software.The model prediction results are in good agreement with the test results.The effects of stiffening on the performance of thin-walled composite columns are then discussed.
2009, 39(4): 5-8,27.
doi: 10.13204/j.gyjz200904002
Abstract:
A total of six specimens were tested under pure bending to investigate the behaviour of FRP-concrete-steel double-skin tubular beams.Three circular and three square specimens were included where circular steel tubes were used as the inner tubes for all specimens.The main experimental parameters considered were the section type(circular and square),the type of FRP sheets(uni-directional and bi-directional),and the number of FRP layers(1～2).The test results provided useful information for the design and applications of this innovative type of composite members.
A total of six specimens were tested under pure bending to investigate the behaviour of FRP-concrete-steel double-skin tubular beams.Three circular and three square specimens were included where circular steel tubes were used as the inner tubes for all specimens.The main experimental parameters considered were the section type(circular and square),the type of FRP sheets(uni-directional and bi-directional),and the number of FRP layers(1～2).The test results provided useful information for the design and applications of this innovative type of composite members.
2009, 39(4): 9-13.
doi: 10.13204/j.gyjz200904003
Abstract:
Test results of six concrete-filled double-skin steel tubular(CFDST) stub columns are presented.Circular hollow sections(CHS) and square hollow sections(SHS) were used to fabricate the inner and outer skins of the composite columns.The main parameters explored in this test programme were the section type(CHS inner and CHS outer,SHS inner and SHS outer,and CHS inner and SHS outer) and whether or not exposure to fire.It was found that the strength of the CFDST columns decreased significantly after exposure to fire.However,the residual strength of these innovative CFDST columns was still comparable to that of conventional concrete-filled steel tubular columns.Of all the three types of sections with a same hollow section ratio,the one with CHS inner and SHS outer shown the highest residual strength,whilst that with CHS inner and CHS outer shown the best ductility behaviour.
Test results of six concrete-filled double-skin steel tubular(CFDST) stub columns are presented.Circular hollow sections(CHS) and square hollow sections(SHS) were used to fabricate the inner and outer skins of the composite columns.The main parameters explored in this test programme were the section type(CHS inner and CHS outer,SHS inner and SHS outer,and CHS inner and SHS outer) and whether or not exposure to fire.It was found that the strength of the CFDST columns decreased significantly after exposure to fire.However,the residual strength of these innovative CFDST columns was still comparable to that of conventional concrete-filled steel tubular columns.Of all the three types of sections with a same hollow section ratio,the one with CHS inner and SHS outer shown the highest residual strength,whilst that with CHS inner and CHS outer shown the best ductility behaviour.
2009, 39(4): 14-17.
doi: 10.13204/j.gyjz200904004
Abstract:
Based on the theoretical and experimental results on fire resistance of concrete-filled steel tubular columns with circular and square sections,two fire design methods,that is,coated fire protection and embedded bars in core concrete were discussed.the composite columns subjected to ISO-834 or GB 9978-88 Standard Fire.As a result,the corresponding simple expressions were given,such formulas were suitable for incorporation into building codes.The validity of the calculation formulas was established by comparing the calculated fire resistances with those obtained from theoretical model and fire tests.
Based on the theoretical and experimental results on fire resistance of concrete-filled steel tubular columns with circular and square sections,two fire design methods,that is,coated fire protection and embedded bars in core concrete were discussed.the composite columns subjected to ISO-834 or GB 9978-88 Standard Fire.As a result,the corresponding simple expressions were given,such formulas were suitable for incorporation into building codes.The validity of the calculation formulas was established by comparing the calculated fire resistances with those obtained from theoretical model and fire tests.
2009, 39(4): 18-21.
doi: 10.13204/j.gyjz200904005
Abstract:
Experimental studies on four concrete-filled steel tubular column to reinforced concrete beam frames under fire have been carried out to study the temperature distributions inside the structures.The effects of column fire protection thickness and the height of the RC beams on the temperature versus fire exposure time curves are analyzed.A finite element model is used to calculate the temperature fields,and it is found that the calculated results show generally good agreements with those of the tests.
Experimental studies on four concrete-filled steel tubular column to reinforced concrete beam frames under fire have been carried out to study the temperature distributions inside the structures.The effects of column fire protection thickness and the height of the RC beams on the temperature versus fire exposure time curves are analyzed.A finite element model is used to calculate the temperature fields,and it is found that the calculated results show generally good agreements with those of the tests.
2009, 39(4): 22-27.
doi: 10.13204/j.gyjz200904006
Abstract:
Based on the determination of material thermal properties and concerning about the effect of water vapor,a finite element FE model was established and introduced to calculate the temperature field of steel beam or reinforced concrete beam to CFTS column connections during fire.Some testing results were used to verify the rationality and feasibility of the theoretical modeling.
Based on the determination of material thermal properties and concerning about the effect of water vapor,a finite element FE model was established and introduced to calculate the temperature field of steel beam or reinforced concrete beam to CFTS column connections during fire.Some testing results were used to verify the rationality and feasibility of the theoretical modeling.
2009, 39(4): 28-32.
doi: 10.13204/j.gyjz200904007
Abstract:
CFST(concrete-filled steel tubular) columns are widely used in practical engineering for its excellent working performance.The core concrete can absorb lots of heat,when outer steel tube is exposed to fire(high temperature),making the temperature of the tube increase more slowly than a single steel tube.So CFST columns have a higher fire resistance than that of bare steel columns.Based on the present material models at elevated temperature,a suitable core concrete material model was modified.A finite element model of circular CFST column was established using ABAQUS software to calculate the fire resistance and the axial displacement vs.time curves.A comparison of the fire resistance between the calculated results and experimental data was discussed,and mechanical behavior analysis of CCFST columns was also performed.Using the method mentioned above,further studies on fire behavior of CFST structures can be performed.
CFST(concrete-filled steel tubular) columns are widely used in practical engineering for its excellent working performance.The core concrete can absorb lots of heat,when outer steel tube is exposed to fire(high temperature),making the temperature of the tube increase more slowly than a single steel tube.So CFST columns have a higher fire resistance than that of bare steel columns.Based on the present material models at elevated temperature,a suitable core concrete material model was modified.A finite element model of circular CFST column was established using ABAQUS software to calculate the fire resistance and the axial displacement vs.time curves.A comparison of the fire resistance between the calculated results and experimental data was discussed,and mechanical behavior analysis of CCFST columns was also performed.Using the method mentioned above,further studies on fire behavior of CFST structures can be performed.
2009, 39(4): 33-36.
doi: 10.13204/j.gyjz200904008
Abstract:
Based on the method of construction safety analysis on hollow steel tube of concrete filled steel tubular(CFST) frame structures previously presented by reference[1],a finite element analysis(FEA) modeling was introduced and performed for hollow steel tubes in a 12-storey CFST frame structure under construction loads.The stress and deformation of the steel tubes were analyzed by using the FEA modelling.Finally,the influence of different construction schemes of the CFST frame structure was discussed primarily.
Based on the method of construction safety analysis on hollow steel tube of concrete filled steel tubular(CFST) frame structures previously presented by reference[1],a finite element analysis(FEA) modeling was introduced and performed for hollow steel tubes in a 12-storey CFST frame structure under construction loads.The stress and deformation of the steel tubes were analyzed by using the FEA modelling.Finally,the influence of different construction schemes of the CFST frame structure was discussed primarily.
2009, 39(4): 37-40.
doi: 10.13204/j.gyjz200904009
Abstract:
The development of ecological architecture in Germany takes the lead in the world both theoretically and technologically.There is a progress in the development of ecological architectures in China,but facing still a lot of problems.To make clear the problems that China meets in this aspect and probe into the mode and method of the progress in ecological architecture in Germany,which can be used for reference,a comparison is made between Germany and China in the development of ecological architectures.
The development of ecological architecture in Germany takes the lead in the world both theoretically and technologically.There is a progress in the development of ecological architectures in China,but facing still a lot of problems.To make clear the problems that China meets in this aspect and probe into the mode and method of the progress in ecological architecture in Germany,which can be used for reference,a comparison is made between Germany and China in the development of ecological architectures.
2009, 39(4): 41-43.
doi: 10.13204/j.gyjz200904010
Abstract:
Luoyang enjoys an important place in Chinese ancient history and Chinese capital history.The master planning of the new campus of HUST,which intends to exhibit the cultural profoundness of Luoyang and build a campus reflecting the ancient city's feature and spiritual outlook,starting from the traditional city,and stressing the criteria and spatial status of town-front yard-backyard-garden-street.
Luoyang enjoys an important place in Chinese ancient history and Chinese capital history.The master planning of the new campus of HUST,which intends to exhibit the cultural profoundness of Luoyang and build a campus reflecting the ancient city's feature and spiritual outlook,starting from the traditional city,and stressing the criteria and spatial status of town-front yard-backyard-garden-street.
2009, 39(4): 44-48.
doi: 10.13204/j.gyjz200904011
Abstract:
Axial load ratio is a main factor affecting the seismic performance of concrete structural walls.However,the influences of ductility demand and the characteristic value of stirrup content in boundary elements are not considered in the allowable axial load ratio specified by the current codes in China.The influence of the characteristic value of stirrup content _v on the displacement ductility ratio _ and allowable axial load ratio,n,for concrete structural walls is studied.It is obtained that the relationships among the ductility ratio,axial load ratio and the characteristic value of stirrup content.The results show that increasing the boundary confinement ratio of the walls can raise allowable axial load ratio.At last,allowable axial load ratio is proposed with various confinement ratios,which is satisfied for certain ductility demand.
Axial load ratio is a main factor affecting the seismic performance of concrete structural walls.However,the influences of ductility demand and the characteristic value of stirrup content in boundary elements are not considered in the allowable axial load ratio specified by the current codes in China.The influence of the characteristic value of stirrup content _v on the displacement ductility ratio _ and allowable axial load ratio,n,for concrete structural walls is studied.It is obtained that the relationships among the ductility ratio,axial load ratio and the characteristic value of stirrup content.The results show that increasing the boundary confinement ratio of the walls can raise allowable axial load ratio.At last,allowable axial load ratio is proposed with various confinement ratios,which is satisfied for certain ductility demand.
2009, 39(4): 49-53.
doi: 10.13204/j.gyjz200904012
Abstract:
In the reinforced concrete shear wall structure and frame-shear wall structure,the story sidesway stiffness of shear wall is complex,it is relative to story height of structure and flexure rigidity of shear wall,and also to disribution type of horizontal forces acting on the shear wall.The main feature is that the sidesway stiffness of first story is the greatest,and along the height of structure the sidesway stiffnesses are reduced story by story.In design practice,concrete analysis must be conducted according to the concrete structure and horizontal forces.
In the reinforced concrete shear wall structure and frame-shear wall structure,the story sidesway stiffness of shear wall is complex,it is relative to story height of structure and flexure rigidity of shear wall,and also to disribution type of horizontal forces acting on the shear wall.The main feature is that the sidesway stiffness of first story is the greatest,and along the height of structure the sidesway stiffnesses are reduced story by story.In design practice,concrete analysis must be conducted according to the concrete structure and horizontal forces.
2009, 39(4): 55-57.
doi: 10.13204/j.gyjz200904013
Abstract:
With the extensive application of pre-twisted beam in engineer structure,it is very important to carry out analytical research of pre-twisted beam,put forward a dependable mechanics analysis model and the calculation theories.The analysis of mechanical property is carried out based on small deformation assumption to get the displacement general solution,and verify its accuracy using ANSYS software.The paper indicates that the general displacement method is feasible,and the displacement of pre-twisted cantilever beam is larger than non-twisted one,and because of pre-twisted angle,the lateral displacements appear.At the same time,the presented general solution offers an accurate displacement interpolation model.
With the extensive application of pre-twisted beam in engineer structure,it is very important to carry out analytical research of pre-twisted beam,put forward a dependable mechanics analysis model and the calculation theories.The analysis of mechanical property is carried out based on small deformation assumption to get the displacement general solution,and verify its accuracy using ANSYS software.The paper indicates that the general displacement method is feasible,and the displacement of pre-twisted cantilever beam is larger than non-twisted one,and because of pre-twisted angle,the lateral displacements appear.At the same time,the presented general solution offers an accurate displacement interpolation model.
2009, 39(4): 58-60,53.
doi: 10.13204/j.gyjz200904014
Abstract:
A bottom frume-aseismic wall building has a poor aseismic behavior due to the greater difference in the characteristics of its upper and lower structures.However in view of the basic national conditions in China this sort of building with such structures will still exist for a considerable long time.The fortification target with three levels of aseismic behavior for this sort of building can be realized so long as aseismic codes are implemented strictly in the design of the building with rational structural layout and the effective aseismic measures being taken for its key positions.
A bottom frume-aseismic wall building has a poor aseismic behavior due to the greater difference in the characteristics of its upper and lower structures.However in view of the basic national conditions in China this sort of building with such structures will still exist for a considerable long time.The fortification target with three levels of aseismic behavior for this sort of building can be realized so long as aseismic codes are implemented strictly in the design of the building with rational structural layout and the effective aseismic measures being taken for its key positions.
2009, 39(4): 61-66.
doi: 10.13204/j.gyjz200904015
Abstract:
During the construction of CPR 1000 demonstration projectLing'ao Nuclear Power Plant(phase-Ⅱ),one owner promotes localization of manufacture of key material and equipment for nuclear power plants.Taking the localization of manufacture of underrelaxation prestressed steel strands for containments for example,it is presented that the demands on products,research flow charts,particularly the demonstration by tests.It has been praved that the home steel strands can meet the tension requirements.
During the construction of CPR 1000 demonstration projectLing'ao Nuclear Power Plant(phase-Ⅱ),one owner promotes localization of manufacture of key material and equipment for nuclear power plants.Taking the localization of manufacture of underrelaxation prestressed steel strands for containments for example,it is presented that the demands on products,research flow charts,particularly the demonstration by tests.It has been praved that the home steel strands can meet the tension requirements.
2009, 39(4): 67-71.
doi: 10.13204/j.gyjz200904016
Abstract:
Based on the previous studies on the subject and by researching on the test of a 1/2-scaled combinational multi-ribbed composite wall under low-cyclic reversed horizontal load in contrast with a standard wall,we are devoted to fulfilling the following points on the combinational wall in this paper: studying the main failure patterns;discussing the mechanical behaviors such as bearing capacity,hysteretic loop and so on,finally giving the formulas of rigidity and shear-bearing capacity.Experiment and theoretic research show: that the value of the shear-bearing capacity formula approximates to the experimental result,and can be applied to practical projects.
Based on the previous studies on the subject and by researching on the test of a 1/2-scaled combinational multi-ribbed composite wall under low-cyclic reversed horizontal load in contrast with a standard wall,we are devoted to fulfilling the following points on the combinational wall in this paper: studying the main failure patterns;discussing the mechanical behaviors such as bearing capacity,hysteretic loop and so on,finally giving the formulas of rigidity and shear-bearing capacity.Experiment and theoretic research show: that the value of the shear-bearing capacity formula approximates to the experimental result,and can be applied to practical projects.
2009, 39(4): 72-76.
doi: 10.13204/j.gyjz200904017
Abstract:
A group of simple beams prestressed with AFRP tendons or steel strand have been tested.The effect of several factors,such as the reinforcement ratios of AFRP tendon and steel rebar,the prestressing force,etc,on the load-carrying capacity of the beams is investigated.And the cracking load,the ultimate load,the load-deflection relationship,the crack development,the plane-section assumption,and the strain developments of AFRP tendon and steel reinforcement are discussed.The results demonstrate: the whole mechanical process of the concrete beam prestressed with AFRP tendons can be idealized to the trilinear relationship.The first stage is from loading to cracking,the second to yield of the tension steel,and the third to the ultimate load-carrying capacity.Although the AFRP tendon material has no the yielding plateau,the beams prestressed with AFRP tendons show clear deformation signs before collapsing because of the low elastic modulus of the AFRP material.When the beams collapse,the AFRP tendon will not always reach the ultimate strain value and its strain can be calculated with the plane-section assumption.In addition,the ultimate load-carrying capacity of the beams can be improved by increasing the prestressing force.
A group of simple beams prestressed with AFRP tendons or steel strand have been tested.The effect of several factors,such as the reinforcement ratios of AFRP tendon and steel rebar,the prestressing force,etc,on the load-carrying capacity of the beams is investigated.And the cracking load,the ultimate load,the load-deflection relationship,the crack development,the plane-section assumption,and the strain developments of AFRP tendon and steel reinforcement are discussed.The results demonstrate: the whole mechanical process of the concrete beam prestressed with AFRP tendons can be idealized to the trilinear relationship.The first stage is from loading to cracking,the second to yield of the tension steel,and the third to the ultimate load-carrying capacity.Although the AFRP tendon material has no the yielding plateau,the beams prestressed with AFRP tendons show clear deformation signs before collapsing because of the low elastic modulus of the AFRP material.When the beams collapse,the AFRP tendon will not always reach the ultimate strain value and its strain can be calculated with the plane-section assumption.In addition,the ultimate load-carrying capacity of the beams can be improved by increasing the prestressing force.
2009, 39(4): 77-83.
doi: 10.13204/j.gyjz200904018
Abstract:
The behavior of the composite ground under a flexible foundation is a complicated problem,which includes the interaction and stress-strain coupling among the flexible foundation,the cushion,the composite ground and the underlying strata.The law of load transfer of composite ground under a flexible foundation is analyzed firstly.And then a simplified analytic model is presented,in which the flexible foundation-cushion-composite ground-underlying strata is considered as an interactive system.According to the compatibility of stress and deformation on the interfaces between these four components,and considering the relative movement between the pile and the soil,the formulas of settlement and stress ratio of pile to soil,which are used to characterize the behavior of the composite ground,are derived.Finally,the rationality and applicability of the analytic solution are proved by one engineering case.
The behavior of the composite ground under a flexible foundation is a complicated problem,which includes the interaction and stress-strain coupling among the flexible foundation,the cushion,the composite ground and the underlying strata.The law of load transfer of composite ground under a flexible foundation is analyzed firstly.And then a simplified analytic model is presented,in which the flexible foundation-cushion-composite ground-underlying strata is considered as an interactive system.According to the compatibility of stress and deformation on the interfaces between these four components,and considering the relative movement between the pile and the soil,the formulas of settlement and stress ratio of pile to soil,which are used to characterize the behavior of the composite ground,are derived.Finally,the rationality and applicability of the analytic solution are proved by one engineering case.
2009, 39(4): 84-87.
doi: 10.13204/j.gyjz200904019
Abstract:
Based on the usage of method of fault tree analysis(FTA),the fault tree of leakage of slurry wall is established and its minimal cut sets is calculated to determine the elementary combination of events resulted in the leakage.The sensitive analysis of factors led to the leakage of slurry wall is carried out and the most sensitive factors set are decided in accordance with probability of all factors.The precaution measures to the leakage of slurry wall are presented.
Based on the usage of method of fault tree analysis(FTA),the fault tree of leakage of slurry wall is established and its minimal cut sets is calculated to determine the elementary combination of events resulted in the leakage.The sensitive analysis of factors led to the leakage of slurry wall is carried out and the most sensitive factors set are decided in accordance with probability of all factors.The precaution measures to the leakage of slurry wall are presented.
2009, 39(4): 88-92.
doi: 10.13204/j.gyjz200904020
Abstract:
An in-situ test of a supergiant pile-raft was performed.During the experiment,a great variety of monitoring instruments were embedded to monitor the deformation of the raft,reaction of the piles,soil pressures in several vertical and laminar displacements.Some important rules about pile-raft foundation are achieved,and some questions of the testing are discussed.Also some shortages of the monitoring instruments are presented.
An in-situ test of a supergiant pile-raft was performed.During the experiment,a great variety of monitoring instruments were embedded to monitor the deformation of the raft,reaction of the piles,soil pressures in several vertical and laminar displacements.Some important rules about pile-raft foundation are achieved,and some questions of the testing are discussed.Also some shortages of the monitoring instruments are presented.
2009, 39(4): 93-97.
doi: 10.13204/j.gyjz200904021
Abstract:
According to cast-in-situ pile stress test results,it is analyzed the influence of pile bottom slime on the pile load transfer.Test results indicate that pile bottom slime has influence upon not only tip of pile resistance,but the skin friction.The pile bottom slime is thicker,the skin friction is smaller.Simultaneously according to the characteristics of load transfer of piles,the estimation method is proposed about the bearing capacity of pile.
According to cast-in-situ pile stress test results,it is analyzed the influence of pile bottom slime on the pile load transfer.Test results indicate that pile bottom slime has influence upon not only tip of pile resistance,but the skin friction.The pile bottom slime is thicker,the skin friction is smaller.Simultaneously according to the characteristics of load transfer of piles,the estimation method is proposed about the bearing capacity of pile.
2009, 39(4): 98-102,105.
doi: 10.13204/j.gyjz200904022
Abstract:
Rehabilitation of RC members with stainless steel wire mesh and permeability polymer mortar is a new method on structural strengthening.The research of the method indicates that debonding failure of reinforced layer is one of the main failure modes.The key of the successful rehabilitation is that how to ensure the bond performance between polymer mortar and concrete.The experimental studies on the tensile bond strength between polymer mortar and concrete are carried out,and the tensile bond performance between polymer mortar and concrete is analyzed,and the influence of concrete strength,interface roughness concentration,curing age and position of the repaired on the bond strength is expounded.The tensile bond strength formula is presented.
Rehabilitation of RC members with stainless steel wire mesh and permeability polymer mortar is a new method on structural strengthening.The research of the method indicates that debonding failure of reinforced layer is one of the main failure modes.The key of the successful rehabilitation is that how to ensure the bond performance between polymer mortar and concrete.The experimental studies on the tensile bond strength between polymer mortar and concrete are carried out,and the tensile bond performance between polymer mortar and concrete is analyzed,and the influence of concrete strength,interface roughness concentration,curing age and position of the repaired on the bond strength is expounded.The tensile bond strength formula is presented.
2009, 39(4): 103-105.
doi: 10.13204/j.gyjz200904023
Abstract:
The experimental studies on the shear bond strength between polymer mortar and concrete are carried out,and the shear bond performance between polymer mortar and concrete is analyzed,and the influence of concrete strength,interface roughness,curing age and repaired position on the bond strength is expounded.The shear bond strength formula is presented.
The experimental studies on the shear bond strength between polymer mortar and concrete are carried out,and the shear bond performance between polymer mortar and concrete is analyzed,and the influence of concrete strength,interface roughness,curing age and repaired position on the bond strength is expounded.The shear bond strength formula is presented.
2009, 39(4): 106-109.
doi: 10.13204/j.gyjz200904024
Abstract:
Based on the results of a mass of grouted concrete masonry tests,deformation compatibility and static balance,the mean compressive strength,f_g,m,is presented by strength ratio of grouted concrete and block.The calculated results have been observed to not only be in good agreement with trial data,but also reflect decrease in the strength of grouted masonry when the strength of grouted concrete was increased.
Based on the results of a mass of grouted concrete masonry tests,deformation compatibility and static balance,the mean compressive strength,f_g,m,is presented by strength ratio of grouted concrete and block.The calculated results have been observed to not only be in good agreement with trial data,but also reflect decrease in the strength of grouted masonry when the strength of grouted concrete was increased.
2009, 39(4): 110-113,144.
doi: 10.13204/j.gyjz200904025
Abstract:
The chacracter of the local Ⅱ grade fly ash from Jiangxi Province was studied using microanalysis technology,and medium strength grade of high fly-ash content concrete(abbreviation : HFCC) was prepared by using five different contents of fly ash and the other local typical raw materials of Jiangxi Province through high-substitute way,then the mechanical properties and durability of the concrete were discussed.The results show that the growth of later strength of HFCC is more substantial than the normal concrete,and its 56 d strength may be over that of the normal concrete,both of the elastic modulus-strength ratio and the permeability are above the normal concrete,but the anti-frost ability and anti-carbonation ability are decreased.
The chacracter of the local Ⅱ grade fly ash from Jiangxi Province was studied using microanalysis technology,and medium strength grade of high fly-ash content concrete(abbreviation : HFCC) was prepared by using five different contents of fly ash and the other local typical raw materials of Jiangxi Province through high-substitute way,then the mechanical properties and durability of the concrete were discussed.The results show that the growth of later strength of HFCC is more substantial than the normal concrete,and its 56 d strength may be over that of the normal concrete,both of the elastic modulus-strength ratio and the permeability are above the normal concrete,but the anti-frost ability and anti-carbonation ability are decreased.
2009, 39(4): 114-118.
doi: 10.13204/j.gyjz200904026
Abstract:
The innovative concrete-filled stainless steel tubular(CFSST) structures combine the advantages of both stainless steel and conventional concrete-filled steel tubular(CFST) structures.Therefore,excellent structural properties and corrosion resistant can be expected,and this construction has a good potential to be used in offshore buildings and bridges,as well as other specific buildings.It is briefly reviewed the present application and research on CFSST structures.The differences of structural and fire-resistant behaviour between CFSST structures and conventional CFST structures are summarized.To better use stainless steel,further research work on CFSST structures is discussed.
The innovative concrete-filled stainless steel tubular(CFSST) structures combine the advantages of both stainless steel and conventional concrete-filled steel tubular(CFST) structures.Therefore,excellent structural properties and corrosion resistant can be expected,and this construction has a good potential to be used in offshore buildings and bridges,as well as other specific buildings.It is briefly reviewed the present application and research on CFSST structures.The differences of structural and fire-resistant behaviour between CFSST structures and conventional CFST structures are summarized.To better use stainless steel,further research work on CFSST structures is discussed.
2009, 39(4): 119-123.
doi: 10.13204/j.gyjz200904027
Abstract:
Taking a typical 3-storey existing residential house in southern region of Jiangsu as a research object,the effectiveness of energy-saving is analyzed after roofs,wall,doors and windows of the residential house is upgraded and the key factor is presented.The optimal design schemes are proposed and the limited values of the coefficient of thermal transmission are recommended at the rate of energy-saving of 25% and 50% in building enclosure.
Taking a typical 3-storey existing residential house in southern region of Jiangsu as a research object,the effectiveness of energy-saving is analyzed after roofs,wall,doors and windows of the residential house is upgraded and the key factor is presented.The optimal design schemes are proposed and the limited values of the coefficient of thermal transmission are recommended at the rate of energy-saving of 25% and 50% in building enclosure.
2009, 39(4): 124-127,132.
doi: 10.13204/j.gyjz200904028
Abstract:
The pre-tensioning methods of FRP sheets applied to strengthen concrete piers are researched and analyzed.Furthermore.A is presented a unique pre-tensioning technique of FRP sheets is presented to strengthen existing concrete piers.Taking a large-sized concrete pier in a railway bridge for example,the advantages of concrete piers strengthened with pre-stressed FRP sheets are compared with no pre-tensioned FRP sheets.Based on Chinese and American codes,the calculation methods of loading capacity and ductility of concrete piers strengthened with pre-stressed FRP sheets are presented.The calculation results show that the loading capacity and ductility of concrete piers can be improved with pre-stressed FRP sheets.Compared with AFRP sheets,CFRP sheet is more suitable as pre-stressed materials to strengthen concrete structures.
The pre-tensioning methods of FRP sheets applied to strengthen concrete piers are researched and analyzed.Furthermore.A is presented a unique pre-tensioning technique of FRP sheets is presented to strengthen existing concrete piers.Taking a large-sized concrete pier in a railway bridge for example,the advantages of concrete piers strengthened with pre-stressed FRP sheets are compared with no pre-tensioned FRP sheets.Based on Chinese and American codes,the calculation methods of loading capacity and ductility of concrete piers strengthened with pre-stressed FRP sheets are presented.The calculation results show that the loading capacity and ductility of concrete piers can be improved with pre-stressed FRP sheets.Compared with AFRP sheets,CFRP sheet is more suitable as pre-stressed materials to strengthen concrete structures.
2009, 39(4): 128-132.
doi: 10.13204/j.gyjz200904029
Abstract:
From designing practice of reinforcement and reconstruction for the old library of Southeast University,it is analysed the research category and the important of endowing old building with new mission.It is brought forward two principles of making the old repaired as the original,and the interactive in the traditional spirit and modern ideology.The two principles are better implemented by the measures of general layout,improving the value of the features,the design of transport space,structure strengthening,adding basic equipment,replacement of matching equipment,fire-fighting design,interior decoration design,energy-saving design,etc.Thus old building was endowed with new mission which,has an important practical significance in the rapid development of modern urban development.
From designing practice of reinforcement and reconstruction for the old library of Southeast University,it is analysed the research category and the important of endowing old building with new mission.It is brought forward two principles of making the old repaired as the original,and the interactive in the traditional spirit and modern ideology.The two principles are better implemented by the measures of general layout,improving the value of the features,the design of transport space,structure strengthening,adding basic equipment,replacement of matching equipment,fire-fighting design,interior decoration design,energy-saving design,etc.Thus old building was endowed with new mission which,has an important practical significance in the rapid development of modern urban development.
2009, 39(4): 133-136,71.
doi: 10.13204/j.gyjz200904030
Abstract:
The building of the former Yihe Spinnery in Shanghai is a protective historical building.To ensure its serviceability,appropriate retrofit is necessary.Structural analysis based on the inspection was performed.It is shown that bearing capacity or ductility of some members in the original structure or retrofit proposal are inadequate.Strengthening design was then performed using the method of section enhancement,externally bonded steel and CFRP sheet.Affection of the subsequent retrofit process on the strengthened structure was also analyzed.The historical building is then properly protected and the new manufacturing requirements are met through the retrofit and strengthening design.The proposed methods can serve as references for relative research or engineering practices.
The building of the former Yihe Spinnery in Shanghai is a protective historical building.To ensure its serviceability,appropriate retrofit is necessary.Structural analysis based on the inspection was performed.It is shown that bearing capacity or ductility of some members in the original structure or retrofit proposal are inadequate.Strengthening design was then performed using the method of section enhancement,externally bonded steel and CFRP sheet.Affection of the subsequent retrofit process on the strengthened structure was also analyzed.The historical building is then properly protected and the new manufacturing requirements are met through the retrofit and strengthening design.The proposed methods can serve as references for relative research or engineering practices.
2009, 39(4): 137-140.
doi: 10.13204/j.gyjz200904031
Abstract:
The local architectural culture taking the traditional Chinese popular settlement as the core is a unity of ecological,shape and spirit concepts.The unified thinking of the said three respects in fully taken into account and used flexibly when studying the planning and design of reconstruction of Chengchao village in Ezhou and a natural village in Jiangxia District of Wuhan.Meanwhile it is also expounded the enlightenment of settlement ecology,shape and spirit wisdorn on the construction of new rural areas.
The local architectural culture taking the traditional Chinese popular settlement as the core is a unity of ecological,shape and spirit concepts.The unified thinking of the said three respects in fully taken into account and used flexibly when studying the planning and design of reconstruction of Chengchao village in Ezhou and a natural village in Jiangxia District of Wuhan.Meanwhile it is also expounded the enlightenment of settlement ecology,shape and spirit wisdorn on the construction of new rural areas.
2009, 39(4): 141-144.
doi: 10.13204/j.gyjz200904032
Abstract:
Through introduction of the scheme of the Nottingham Science Park,this paper summarizes it's holistic idea of sustainability which pay attention to society,economy and physical environment simultaneously,and it's approach to creat a distinctive environment by corresponding the site feature,and a holistic idea of environmental sustainability is thereby proposed.
Through introduction of the scheme of the Nottingham Science Park,this paper summarizes it's holistic idea of sustainability which pay attention to society,economy and physical environment simultaneously,and it's approach to creat a distinctive environment by corresponding the site feature,and a holistic idea of environmental sustainability is thereby proposed.
