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2011 Vol. 41, No. 2
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2011, 41(2): 1-6.
doi: 10.13204/j.gyjz201102001
Abstract:
The article takes the planning of intravenous industrial park as the research object.By introducing the related concepts of intravenous industry and intravenous industrial park and the low carbon and ecological goal in such park,it is summarized.The plan principles which include the reasonable structure of industry、the efficient system of traffic and energy,ecological building of landscape environment,etc.Then the article analyzes the advantages and disadvantages of two typical intravenous industrial parks in China.The article points out that the key issues of the plan of an intravenous industrial park lie in dealing well with the relationship between city development and environment influence,establishing the mutual guidance relationship between the space layout and efficient industry chain,and building up the ecological space of intravenous industrial park by reasonable distribution of green system.
The article takes the planning of intravenous industrial park as the research object.By introducing the related concepts of intravenous industry and intravenous industrial park and the low carbon and ecological goal in such park,it is summarized.The plan principles which include the reasonable structure of industry、the efficient system of traffic and energy,ecological building of landscape environment,etc.Then the article analyzes the advantages and disadvantages of two typical intravenous industrial parks in China.The article points out that the key issues of the plan of an intravenous industrial park lie in dealing well with the relationship between city development and environment influence,establishing the mutual guidance relationship between the space layout and efficient industry chain,and building up the ecological space of intravenous industrial park by reasonable distribution of green system.
2011, 41(2): 7-9.
doi: 10.13204/j.gyjz201102002
Abstract:
Based on the design of the standard factory buildings in Suzhou,it was put forward some points of standard factorys design.First of all,development direction of an industrial park should be clear and the general layout of the factory park should be scientific.Further more,it was clarified the strategy of how to satisfy the flexible use of the standard factory buildings,and how to design the facade of industrial buildings and handle the details.In the end it was also put forward some thinkings of environmental protection and energy conservation.
Based on the design of the standard factory buildings in Suzhou,it was put forward some points of standard factorys design.First of all,development direction of an industrial park should be clear and the general layout of the factory park should be scientific.Further more,it was clarified the strategy of how to satisfy the flexible use of the standard factory buildings,and how to design the facade of industrial buildings and handle the details.In the end it was also put forward some thinkings of environmental protection and energy conservation.
2011, 41(2): 10-13.
doi: 10.13204/j.gyjz201102003
Abstract:
In-depth understanding of the green industrial building is acquired in the process of designing Pratt Whitneys Shanghai Engine Center as well as the LEED-NC platinum accreditation.A green industrial building is the one with less investment,pressing close to nature,environmentally-friendly,and sustainable development instead of garden-style factory,high-technology,or considerable investment.Green building is a down-to-earth concept,which needs to be done in scientific system engineering approach.
In-depth understanding of the green industrial building is acquired in the process of designing Pratt Whitneys Shanghai Engine Center as well as the LEED-NC platinum accreditation.A green industrial building is the one with less investment,pressing close to nature,environmentally-friendly,and sustainable development instead of garden-style factory,high-technology,or considerable investment.Green building is a down-to-earth concept,which needs to be done in scientific system engineering approach.
2011, 41(2): 14-17,23.
doi: 10.13204/j.gyjz201102004
Abstract:
An excellent industrial building is not only with right production-process flow,but also concerns lots for its users on aspects of interior and exterior space,and the environment around it.The design for production building of film lithium solar cell factory of Yingxin Glass Group Co.,Ltd.in Heibei does well in all theses respects.The design will lead people to a new cognition of industrial building.
An excellent industrial building is not only with right production-process flow,but also concerns lots for its users on aspects of interior and exterior space,and the environment around it.The design for production building of film lithium solar cell factory of Yingxin Glass Group Co.,Ltd.in Heibei does well in all theses respects.The design will lead people to a new cognition of industrial building.
2011, 41(2): 18-20.
doi: 10.13204/j.gyjz201102005
Abstract:
This article aimed at case study based on the reuse of old industrial factory buildings.Based on the empirical analysis of this engineering project,the article reflected the prospects of reforming the old workshop building.Meanwhile,it illustrated the architectural approach to this case,explained how to implement this transforming project in brief.In conclusion,the article showed that the transforming project of old industrial buildings had significant influence,not only on the economy,but also on the society and ecology,which kept the integrity of the city image.
This article aimed at case study based on the reuse of old industrial factory buildings.Based on the empirical analysis of this engineering project,the article reflected the prospects of reforming the old workshop building.Meanwhile,it illustrated the architectural approach to this case,explained how to implement this transforming project in brief.In conclusion,the article showed that the transforming project of old industrial buildings had significant influence,not only on the economy,but also on the society and ecology,which kept the integrity of the city image.
2011, 41(2): 21-23.
doi: 10.13204/j.gyjz201102006
Abstract:
As one of the active factors to promote urban vitality and cultural character,industrial heritage in urban waterfront areas plays an important role in urban preservation and urban regeneration.This article made a brief introduction on a rehabilitation project of Deal Pier in the UK.From the perspectives of adaptive reuse of the historic building and design concepts of sustainability and ecology,it was analyzed potentials and methods to rehabilitate industrial heritage in urban waterfront areas during the urban regeneration process,with the intention to reach the holistic sustainability for urban economics,society and culture.It also provided scientific ideas and good references for further urban regeneration and reuse of industrial heritage in waterfront areas in China.
As one of the active factors to promote urban vitality and cultural character,industrial heritage in urban waterfront areas plays an important role in urban preservation and urban regeneration.This article made a brief introduction on a rehabilitation project of Deal Pier in the UK.From the perspectives of adaptive reuse of the historic building and design concepts of sustainability and ecology,it was analyzed potentials and methods to rehabilitate industrial heritage in urban waterfront areas during the urban regeneration process,with the intention to reach the holistic sustainability for urban economics,society and culture.It also provided scientific ideas and good references for further urban regeneration and reuse of industrial heritage in waterfront areas in China.
2011, 41(2): 24-28.
doi: 10.13204/j.gyjz201102007
Abstract:
During the process of urban development and industrial transformation,water towers,the industrial heritage structures seen everywhere,are facing the grim situation of being destructed together with the industrial heritages.In fact,water towers are often the visual focus and the Monument of traditional industrial park,which could be conserved and reused as the memory of the urban history and industrial age.In this paper,two water tower reconstruction project cases from the Netherlands are introduced,to raise the level of transformation using small-scale industrial structures such as water towers,etc,and to provide inspiration to the conservative reuse of industrial heritage.
During the process of urban development and industrial transformation,water towers,the industrial heritage structures seen everywhere,are facing the grim situation of being destructed together with the industrial heritages.In fact,water towers are often the visual focus and the Monument of traditional industrial park,which could be conserved and reused as the memory of the urban history and industrial age.In this paper,two water tower reconstruction project cases from the Netherlands are introduced,to raise the level of transformation using small-scale industrial structures such as water towers,etc,and to provide inspiration to the conservative reuse of industrial heritage.
2011, 41(2): 29-31,44.
doi: 10.13204/j.gyjz201102008
Abstract:
Taking the foreign warehouse at south railway station in Changsha for example,it is analyzed the design by qualitative and quantitative methods.It is also analyzed the site through in-situ investigation,mapping and collecting relevant data.Based on which,it is researched the countermeasures for its protection and development;it is finally summarized the reasonable protective and renewal mode of industrial heritage,as well as the rational renewal design of monomer buildings.
Taking the foreign warehouse at south railway station in Changsha for example,it is analyzed the design by qualitative and quantitative methods.It is also analyzed the site through in-situ investigation,mapping and collecting relevant data.Based on which,it is researched the countermeasures for its protection and development;it is finally summarized the reasonable protective and renewal mode of industrial heritage,as well as the rational renewal design of monomer buildings.
2011, 41(2): 32-34.
doi: 10.13204/j.gyjz201102009
Abstract:
Some problems of the vertical earthquake responses of the mega-beam floor in both the vibration-absorption structure with large tuned mass ratio and the common mega frame are discussed based on random vibration theory,and some design advices from practical conformation are provided for resolving the excessive dynamical responses of the large-span mega-beam floor.The results indicate: the maximal vertical earthquake response of the mega-beam floor is located around its middle part;the vertical earthquake response of the mega-beam floor is increasing with its location in the heightened structure;the vertical earthquake responses of the large-span mega-beam floor with a sub-frame,are depressed.
Some problems of the vertical earthquake responses of the mega-beam floor in both the vibration-absorption structure with large tuned mass ratio and the common mega frame are discussed based on random vibration theory,and some design advices from practical conformation are provided for resolving the excessive dynamical responses of the large-span mega-beam floor.The results indicate: the maximal vertical earthquake response of the mega-beam floor is located around its middle part;the vertical earthquake response of the mega-beam floor is increasing with its location in the heightened structure;the vertical earthquake responses of the large-span mega-beam floor with a sub-frame,are depressed.
2011, 41(2): 35-38.
doi: 10.13204/j.gyjz201102010
Abstract:
Through structural performance experimental study and contrastive analysis of 4 single supported prestressed-concrete laminated hollow slabs(170 mm) and 8 single supported prestressed concrete hollow soleplate(120 mm),it was researched anti-cracking,crack development regularity,the amount of deflection and load bearing capacity of prestressed-concrete laminated hollow slabs.It was shown by the analysis that span-depth ratio and steel ratio were the main factors influencing the failure property of prestressed-concrete laminated hollow slabs,it was analyzed and validated anti-cracking capacity could not be reduced because of taminated.
Through structural performance experimental study and contrastive analysis of 4 single supported prestressed-concrete laminated hollow slabs(170 mm) and 8 single supported prestressed concrete hollow soleplate(120 mm),it was researched anti-cracking,crack development regularity,the amount of deflection and load bearing capacity of prestressed-concrete laminated hollow slabs.It was shown by the analysis that span-depth ratio and steel ratio were the main factors influencing the failure property of prestressed-concrete laminated hollow slabs,it was analyzed and validated anti-cracking capacity could not be reduced because of taminated.
2011, 41(2): 39-44.
doi: 10.13204/j.gyjz201102011
Abstract:
According to construction of Kuiqi two bores and eight lanes tunnel with super-large section and span,a 3D mathematic model was setup using ANSYS software,it was analyzed the variation of tunnel rocks displacement,equivalent plastic strain and the safety factors with different net distances and determined the safety net distance of large span neighbourhood tunnels.In the process of tunnel excavation simulation,three support parameters of middle rock pillar were used to study the force and deformation characteristics of middle rock pillar under Ⅲ,Ⅳ and Ⅴ level surrounding rocks.The results provided scientific basis for support design,excavation method and strengthening method of large span neighbourhood tunnel.
According to construction of Kuiqi two bores and eight lanes tunnel with super-large section and span,a 3D mathematic model was setup using ANSYS software,it was analyzed the variation of tunnel rocks displacement,equivalent plastic strain and the safety factors with different net distances and determined the safety net distance of large span neighbourhood tunnels.In the process of tunnel excavation simulation,three support parameters of middle rock pillar were used to study the force and deformation characteristics of middle rock pillar under Ⅲ,Ⅳ and Ⅴ level surrounding rocks.The results provided scientific basis for support design,excavation method and strengthening method of large span neighbourhood tunnel.
ANALYSIS OF EXCESS PORE WATER PRESSURE CAUSED BY CONSTRUCTION OF SINGLE ENHANCEMENT CENTRIFUGAL PIPE
2011, 41(2): 45-48,56.
doi: 10.13204/j.gyjz201102012
Abstract:
Prestressed concrete pipes construction by hammer can produce high excess pore water pressure in deep soft soils because of violent disturbance and poor permeability of soft soil.Through analyzing the data of excess pore pressure in sites,it was analysed excess pore pressures distribution distance against the pile and along depth,and was also studied excessive pore water pressure change in different time of single pile construction.The analysis results show that the notable influencing range of single pile construction is about 17.5 times of the pile diameter,and the peak excess pore pressure does not necessarily appear at the end of the last section pile construction,and excess pore water pressure caused by the construction of single enhancement centrifugal pile dissipates faster than that induced by normal prestressed concrete,and 70% to 80% excess pore water pressure can be dissipated after 4 hours in the end of single pile construction.
Prestressed concrete pipes construction by hammer can produce high excess pore water pressure in deep soft soils because of violent disturbance and poor permeability of soft soil.Through analyzing the data of excess pore pressure in sites,it was analysed excess pore pressures distribution distance against the pile and along depth,and was also studied excessive pore water pressure change in different time of single pile construction.The analysis results show that the notable influencing range of single pile construction is about 17.5 times of the pile diameter,and the peak excess pore pressure does not necessarily appear at the end of the last section pile construction,and excess pore water pressure caused by the construction of single enhancement centrifugal pile dissipates faster than that induced by normal prestressed concrete,and 70% to 80% excess pore water pressure can be dissipated after 4 hours in the end of single pile construction.
2011, 41(2): 49-52.
doi: 10.13204/j.gyjz201102013
Abstract:
Four groups pull-out model tests of underreamed ground anchor were done by self-designed anchor drawing device,which was used to research the ultimate bearing capacity about diameter and length of underreamed segment.The test results show that Q-s curves have three phases,expanded diameter has more impact on the ultimate bearing capacity,and the effect of length is relatively small.The underreamed anchor has obviously the size effect,the optimization of underreamed bodys diameter and length will achieve the technical advantage and economical benefit in practice.
Four groups pull-out model tests of underreamed ground anchor were done by self-designed anchor drawing device,which was used to research the ultimate bearing capacity about diameter and length of underreamed segment.The test results show that Q-s curves have three phases,expanded diameter has more impact on the ultimate bearing capacity,and the effect of length is relatively small.The underreamed anchor has obviously the size effect,the optimization of underreamed bodys diameter and length will achieve the technical advantage and economical benefit in practice.
2011, 41(2): 53-56.
doi: 10.13204/j.gyjz201102014
Abstract:
Effective reinforced depth and settlement of dynamic compaction are the two major indexes in evaluation of effect of dynamic compaction in collapsible loess,and the main factors influencing the treatment effects are water content,void ratio of soil and tamping energy.By analysis of large amount of data on projects treated by low-middle elnrgy dynamic compaction in loess,the water content conditions for dynamic compaction were obtained,and the relationship between treatment effects and influencing factors was established by multivariate linear regression analysis.
Effective reinforced depth and settlement of dynamic compaction are the two major indexes in evaluation of effect of dynamic compaction in collapsible loess,and the main factors influencing the treatment effects are water content,void ratio of soil and tamping energy.By analysis of large amount of data on projects treated by low-middle elnrgy dynamic compaction in loess,the water content conditions for dynamic compaction were obtained,and the relationship between treatment effects and influencing factors was established by multivariate linear regression analysis.
2011, 41(2): 57-60.
doi: 10.13204/j.gyjz201102015
Abstract:
It was tested the physical and mechanical properties of recycled coarse aggregate under the different gradation,and designed three kind recycled concrete specimens of different maximum particle sizes,and the concluded by analyzing data: Recycled coarse aggregate,regardless of the continuous gradation or the single gradation,its apparent density,bulk density were all lower than the natural crushed stone,but the moisture content,the crush indicators and water-absorptivity are greater;but the continuous gradation and the single gradation performances were also different.The recycled concrete workability increases with the water consumption and addition of mixture,but the intensity was reduced.
It was tested the physical and mechanical properties of recycled coarse aggregate under the different gradation,and designed three kind recycled concrete specimens of different maximum particle sizes,and the concluded by analyzing data: Recycled coarse aggregate,regardless of the continuous gradation or the single gradation,its apparent density,bulk density were all lower than the natural crushed stone,but the moisture content,the crush indicators and water-absorptivity are greater;but the continuous gradation and the single gradation performances were also different.The recycled concrete workability increases with the water consumption and addition of mixture,but the intensity was reduced.
2011, 41(2): 61-65.
doi: 10.13204/j.gyjz201102016
Abstract:
Hot rolled ribbed bars of fine grains are new type of steel bars with high strength and good ductility,its characteristic value of yielding strength is 500 MPa.Experiment in bond-anchorage of the new re-bars was performed through 25 groups(75 pieces) of pull-out specimens,the main factors that affect the bond-anchorage strength such as the strength of concrete,the development length of bars,the diameter of bars,the cover thickness of concrete and the transverse steel ratio were analyzed.The results show that the bond-anchorage property of hot rolled ribbed bars of fine grains in concrete is almost the same as the common hot rolled ribbed bars,the anchorage development length of the new re-bars can be designed with the stipulations in Code for Design of Concrete Structures(GB 500102002).This proposal may be as a reference for the applications of hot rolled ribbed bars of fine grains in projects.
Hot rolled ribbed bars of fine grains are new type of steel bars with high strength and good ductility,its characteristic value of yielding strength is 500 MPa.Experiment in bond-anchorage of the new re-bars was performed through 25 groups(75 pieces) of pull-out specimens,the main factors that affect the bond-anchorage strength such as the strength of concrete,the development length of bars,the diameter of bars,the cover thickness of concrete and the transverse steel ratio were analyzed.The results show that the bond-anchorage property of hot rolled ribbed bars of fine grains in concrete is almost the same as the common hot rolled ribbed bars,the anchorage development length of the new re-bars can be designed with the stipulations in Code for Design of Concrete Structures(GB 500102002).This proposal may be as a reference for the applications of hot rolled ribbed bars of fine grains in projects.
2011, 41(2): 66-69.
doi: 10.13204/j.gyjz201102017
Abstract:
It is introduced a new type of chemical anchoring bolt,and the anchoring agent of the chemical anchoring bolt is composed of inorganic chemistry material,and it has good resistance to elevated temperatures.According to the pull-out test of the M12 new type of chemical anchoring bolts in C30 concrete,the failure mode in different anchorage length is analyzed and the effective anchorage length in C30 concrete is obtained and further the design capacity is also got,the result provides a basis for its engineering application design.
It is introduced a new type of chemical anchoring bolt,and the anchoring agent of the chemical anchoring bolt is composed of inorganic chemistry material,and it has good resistance to elevated temperatures.According to the pull-out test of the M12 new type of chemical anchoring bolts in C30 concrete,the failure mode in different anchorage length is analyzed and the effective anchorage length in C30 concrete is obtained and further the design capacity is also got,the result provides a basis for its engineering application design.
2011, 41(2): 70-73,77.
doi: 10.13204/j.gyjz201102018
Abstract:
An experimental study on 36 notched flexural panels with steel fiber and PP fiber has been carried out.The load-deflection curves,load-crack mouth opening displacement curves and crack mouth opening displace ment-deflection curves have been analyzed.The research results on the energy absorption of FRC notched panels with different fiber types and fiber contents at various deformation stages are presented.The results indicate that steel fiber can obviously improve the bending resistance;the bending behavior of the concrete notched panel with 6 kg /m3 PP fiber is close to that of the one with 20 kg /m3 steel fiber.
An experimental study on 36 notched flexural panels with steel fiber and PP fiber has been carried out.The load-deflection curves,load-crack mouth opening displacement curves and crack mouth opening displace ment-deflection curves have been analyzed.The research results on the energy absorption of FRC notched panels with different fiber types and fiber contents at various deformation stages are presented.The results indicate that steel fiber can obviously improve the bending resistance;the bending behavior of the concrete notched panel with 6 kg /m3 PP fiber is close to that of the one with 20 kg /m3 steel fiber.
2011, 41(2): 74-77.
doi: 10.13204/j.gyjz201102019
Abstract:
The progressive collapse of structures becomes a hotspot for study over the world.On the basis of comparing the concept of progressive collapse,the main characteristics and essence of progressive collapse were given.The difference and sameness of seismic design and progressive collapse design were also discussed.And the effect of foundation design on controlling the progressive collapse of structures was explained.
The progressive collapse of structures becomes a hotspot for study over the world.On the basis of comparing the concept of progressive collapse,the main characteristics and essence of progressive collapse were given.The difference and sameness of seismic design and progressive collapse design were also discussed.And the effect of foundation design on controlling the progressive collapse of structures was explained.
2011, 41(2): 78-82.
doi: 10.13204/j.gyjz201102020
Abstract:
The stiffness requirements of the diagonal bracings in order to maintain the stability of longitudinal columns under the only vertical loads have been investigated in this paper.The lateral stiffness requirements of one-story and two-story longitudinal column-bracing systems without the initial imperfections were introduced.One-story and two-story longitudinal column-bracing systems under the only vertical loads were analyzed using the ANSYS program,in which two order effects on P- and P- were well considered according to the initial imperfections of the actual frames.According to the analysis results,the design formulas of stiffness requirements of the diagonal bracings for one-story and two-story longitudinal column-bracing systems were obtained,and a check method based on the vertical loading analysis was supplied for the diagonal bracings,which is usually designed by the longitudinal horizontal loads.
The stiffness requirements of the diagonal bracings in order to maintain the stability of longitudinal columns under the only vertical loads have been investigated in this paper.The lateral stiffness requirements of one-story and two-story longitudinal column-bracing systems without the initial imperfections were introduced.One-story and two-story longitudinal column-bracing systems under the only vertical loads were analyzed using the ANSYS program,in which two order effects on P- and P- were well considered according to the initial imperfections of the actual frames.According to the analysis results,the design formulas of stiffness requirements of the diagonal bracings for one-story and two-story longitudinal column-bracing systems were obtained,and a check method based on the vertical loading analysis was supplied for the diagonal bracings,which is usually designed by the longitudinal horizontal loads.
2011, 41(2): 83-89.
doi: 10.13204/j.gyjz201102021
Abstract:
Inelastic analysis stability is carried out for tapered beams by ANSYS,considering plasticity developemnt,introducing the universal slenderness of beams in which the taper ratio and moment ratio are considered,a new formula of stability coefficient is proposed.For the out-plane buckling of tapered beam-columns,another new formula is proposed in which axial force and moment and sectional properties are taked from the larger end of tapered members,and the moment term in the formula takes a exponent that varies with slenderness and taper ratio slightly.FEM result obtained by analysis is compared with the results calculated from the proposed formula,and the result is agreeable.
Inelastic analysis stability is carried out for tapered beams by ANSYS,considering plasticity developemnt,introducing the universal slenderness of beams in which the taper ratio and moment ratio are considered,a new formula of stability coefficient is proposed.For the out-plane buckling of tapered beam-columns,another new formula is proposed in which axial force and moment and sectional properties are taked from the larger end of tapered members,and the moment term in the formula takes a exponent that varies with slenderness and taper ratio slightly.FEM result obtained by analysis is compared with the results calculated from the proposed formula,and the result is agreeable.
2011, 41(2): 90-96,52.
doi: 10.13204/j.gyjz201102022
Abstract:
The I-section steel arch structure has been applied widely in kinds of projects because of its beautiful shape,good mechanical property and simple manufacturing.However,the technical specification for steel arch structure has not been put forward yet,and the current codes and technical regulations for design of steel structures include no technology items for steel arch structure.Compared to the web of straight beam and column,the normal stress and shear stress also exist in welding I-section steel arch,but the most difference between them is the geometrical shape of the web,that for straight beam and column is rectangular while the one for welded I-section steel arch is arc,which makes the behaviors different.When an pin-ended arch is subjected to a radial load uniformly distributed around the arch axis,the load primarily produces uniform axial compression.The models simulating the I-section steel arch subjected to uniformly distributed radial load were built,with which the elastic buckling coefficients of single archy plates were obtained under the conditions of simply supported and fixedly supported loading side,and the related formulas were obtained through data fitting referencing the theory of elastic buckling of rectangle plate.Then,the elastic buckling coefficients and the related formulas of I-section steel arch were obtained considering the arbitrary degree rotational restraints of flanges to webs.
The I-section steel arch structure has been applied widely in kinds of projects because of its beautiful shape,good mechanical property and simple manufacturing.However,the technical specification for steel arch structure has not been put forward yet,and the current codes and technical regulations for design of steel structures include no technology items for steel arch structure.Compared to the web of straight beam and column,the normal stress and shear stress also exist in welding I-section steel arch,but the most difference between them is the geometrical shape of the web,that for straight beam and column is rectangular while the one for welded I-section steel arch is arc,which makes the behaviors different.When an pin-ended arch is subjected to a radial load uniformly distributed around the arch axis,the load primarily produces uniform axial compression.The models simulating the I-section steel arch subjected to uniformly distributed radial load were built,with which the elastic buckling coefficients of single archy plates were obtained under the conditions of simply supported and fixedly supported loading side,and the related formulas were obtained through data fitting referencing the theory of elastic buckling of rectangle plate.Then,the elastic buckling coefficients and the related formulas of I-section steel arch were obtained considering the arbitrary degree rotational restraints of flanges to webs.
2011, 41(2): 97-101,69.
doi: 10.13204/j.gyjz201102023
Abstract:
A new type of concrete-filled steel tube(CFST) column-RC beam joint was presented in this paper.In the CFST column-RC beam connecting zone,the out steel tube of CFST column locally opened rectangular hole and stiffened,the longitudinal reinforcing bars in RC beam stretched into the joint.The concrete was monolithically cast in the region of the beam,the column and the joint.The construction of joint was simplified and the joint stiffness was strengthened.The wasted energy behaviour,failure process and the failure mode of the specimen members were studied by experiments.The studies showed that the hysteretic curves of the joint had plump shuttle shape and the joint did not fail when the specimen was in limit state,while the beam was damaged.The feasibility of the joint in the static load was proved.The joint can meet the seismic design principles ofstrong column,weak beam and stronger joint.
A new type of concrete-filled steel tube(CFST) column-RC beam joint was presented in this paper.In the CFST column-RC beam connecting zone,the out steel tube of CFST column locally opened rectangular hole and stiffened,the longitudinal reinforcing bars in RC beam stretched into the joint.The concrete was monolithically cast in the region of the beam,the column and the joint.The construction of joint was simplified and the joint stiffness was strengthened.The wasted energy behaviour,failure process and the failure mode of the specimen members were studied by experiments.The studies showed that the hysteretic curves of the joint had plump shuttle shape and the joint did not fail when the specimen was in limit state,while the beam was damaged.The feasibility of the joint in the static load was proved.The joint can meet the seismic design principles ofstrong column,weak beam and stronger joint.
2011, 41(2): 102-107.
doi: 10.13204/j.gyjz201102024
Abstract:
In this paper,it is briefly introduced the scheduling system and characteristics of Eurocodes,and briefly described the basis of structural design,such as design situation,design working life,consequences classes,ultimate limit state and so on.It is focused on the similarities and differences between Eurocodes and Chinese codes in the partial factor method.
In this paper,it is briefly introduced the scheduling system and characteristics of Eurocodes,and briefly described the basis of structural design,such as design situation,design working life,consequences classes,ultimate limit state and so on.It is focused on the similarities and differences between Eurocodes and Chinese codes in the partial factor method.
2011, 41(2): 108-112,107.
doi: 10.13204/j.gyjz201102025
Abstract:
The clause of performance-based seismic design of structures was added to,Code for Seismic Design of Buildings,which proposed specific indexes of four performance levels and reference procedures to achieve the objectives of performance-based seismic design.In order to verify the rationality of the method,a reinforced concrete frame structure was taken for example,the bearing capacity of the frame beam and column elements as well as the storey drift of the structure were calculated.The results show that if the bearing capacity requirements of different performance levels were satisfied for the rare earthquake action,the section sizes and reinforcing bars quantity of the frame beam and column elements would be increased sharply.Similarly,in order to meet the storey drift demands of different performance levels for the rare earthquake action,the cross-sectional dimensions of the frame components would be increased greatly,which can not conform to the economic and rational design principles.The storey drift reference indexes proposed by the code,on the performance of 3,were low for the rare earthquake action;and on the performance of 4,were low for the fortification intensity earthquake action.
The clause of performance-based seismic design of structures was added to,Code for Seismic Design of Buildings,which proposed specific indexes of four performance levels and reference procedures to achieve the objectives of performance-based seismic design.In order to verify the rationality of the method,a reinforced concrete frame structure was taken for example,the bearing capacity of the frame beam and column elements as well as the storey drift of the structure were calculated.The results show that if the bearing capacity requirements of different performance levels were satisfied for the rare earthquake action,the section sizes and reinforcing bars quantity of the frame beam and column elements would be increased sharply.Similarly,in order to meet the storey drift demands of different performance levels for the rare earthquake action,the cross-sectional dimensions of the frame components would be increased greatly,which can not conform to the economic and rational design principles.The storey drift reference indexes proposed by the code,on the performance of 3,were low for the rare earthquake action;and on the performance of 4,were low for the fortification intensity earthquake action.
2011, 41(2): 113-117,13.
doi: 10.13204/j.gyjz201102026
Abstract:
Two interior columns on the second floor of an office buildings podium need to be removed due to functional change of the building.The amplitude of load-transition on foundation and variation of internal forces in members of the structure were calculated based on the updated load transferring path.The influence of the two removed columns on lateral stiffness and seismic performance of the structure was analyzed as well.To meet the architectural use of space and ensure convenience for construction,an integrated strengthening technology was proposed including increase of columns section,application of pre-stressed struts,bonding of external FRP plates,addition of steel bars and so on.Each method is proposed to strengthen or retrofit a specific type of members,which can provide a reference for similar structural strengthening.
Two interior columns on the second floor of an office buildings podium need to be removed due to functional change of the building.The amplitude of load-transition on foundation and variation of internal forces in members of the structure were calculated based on the updated load transferring path.The influence of the two removed columns on lateral stiffness and seismic performance of the structure was analyzed as well.To meet the architectural use of space and ensure convenience for construction,an integrated strengthening technology was proposed including increase of columns section,application of pre-stressed struts,bonding of external FRP plates,addition of steel bars and so on.Each method is proposed to strengthen or retrofit a specific type of members,which can provide a reference for similar structural strengthening.
2011, 41(2): 118-122.
doi: 10.13204/j.gyjz201102027
Abstract:
This paper introduces a six-story brick students dormitory of a vocational school,the original earthquake fortification intensity was 6 degrees,fortification category was C-class.After the Wenchuan earthquake,the fortification intensity of Deyang was raised to 7 degrees,the classfication for earthquake-resistance of middleschool buildings became B-class.The project concluded with seismic inspection report,the seismic calculation results and the requests of the measures for 8-degree earthquake-resistant construction,which used these reinforcements:adding tie columns at the junction of interior and exterior wall,steel grid mortar surface to reinforce the wall,adding fine aggregate concrete lamination layer on the precast slabs.These reinforcement programs can strengthen the integrity of the structure,enhance the ductility of the wall,and improve the aseismatic performance of the building.
This paper introduces a six-story brick students dormitory of a vocational school,the original earthquake fortification intensity was 6 degrees,fortification category was C-class.After the Wenchuan earthquake,the fortification intensity of Deyang was raised to 7 degrees,the classfication for earthquake-resistance of middleschool buildings became B-class.The project concluded with seismic inspection report,the seismic calculation results and the requests of the measures for 8-degree earthquake-resistant construction,which used these reinforcements:adding tie columns at the junction of interior and exterior wall,steel grid mortar surface to reinforce the wall,adding fine aggregate concrete lamination layer on the precast slabs.These reinforcement programs can strengthen the integrity of the structure,enhance the ductility of the wall,and improve the aseismatic performance of the building.
2011, 41(2): 123-126,122.
doi: 10.13204/j.gyjz201102028
Abstract:
The extension-story design of a framed office building is introduced.First the dynamic characteristics of the structure with directive adding stores are analyzed,and what structural members should be reinforced are determined.Weak stiffness,low bearing capacity and detail design problems of the old frame can be found.Second,the design of anti-seismic strengthening is carried out and attention should be paid to coordination with the other departments.Finally,the dynamic characteristics of the designed structure are tested,and that satisfied the various requirements of current code.The design is one of the reinforcement programs of the project,which can be reference for other projects.
The extension-story design of a framed office building is introduced.First the dynamic characteristics of the structure with directive adding stores are analyzed,and what structural members should be reinforced are determined.Weak stiffness,low bearing capacity and detail design problems of the old frame can be found.Second,the design of anti-seismic strengthening is carried out and attention should be paid to coordination with the other departments.Finally,the dynamic characteristics of the designed structure are tested,and that satisfied the various requirements of current code.The design is one of the reinforcement programs of the project,which can be reference for other projects.
2011, 41(2): 127-129.
doi: 10.13204/j.gyjz201102029
Abstract:
Aim at an adding story workshop collapsed,firstly,the accident-location investigation is carried out and structural bearing capacity is calibrated by using SAP 2000 finite element software.Then,the reason why the adding story workshop collapsed was analyzed and a verdict was got from the two aspects of design and construction.Finally,conclusions and recommendations were presented,meanwhile,the treatment method was proposed.Studies have shown that there are many illegal operations in design and construction of the project,all kinds of defects accumulated and interwoven led to the accident.Therefore,in construction,only a sound regulatory system of construction has been established,and the projects have been designed and constructed strictly in accordance with the relevant norms and standards,the level of project quality will be improved and the occurrence of work accidents will be avoided.
Aim at an adding story workshop collapsed,firstly,the accident-location investigation is carried out and structural bearing capacity is calibrated by using SAP 2000 finite element software.Then,the reason why the adding story workshop collapsed was analyzed and a verdict was got from the two aspects of design and construction.Finally,conclusions and recommendations were presented,meanwhile,the treatment method was proposed.Studies have shown that there are many illegal operations in design and construction of the project,all kinds of defects accumulated and interwoven led to the accident.Therefore,in construction,only a sound regulatory system of construction has been established,and the projects have been designed and constructed strictly in accordance with the relevant norms and standards,the level of project quality will be improved and the occurrence of work accidents will be avoided.
2011, 41(2): 130-132,60.
doi: 10.13204/j.gyjz201102030
Abstract:
According to the analysis of the residential buildings in Wuhan,taking Hankou Tainingli for example,this paper researches retrofit design and renewal of Wuhan Lifen buildings.Based on the view of saving,updating and continuing urban history the charm of a city is tapped and new form of space is re-erected.It is expected that these strategies would be useful for protection,renovation and development of residential buildings.
According to the analysis of the residential buildings in Wuhan,taking Hankou Tainingli for example,this paper researches retrofit design and renewal of Wuhan Lifen buildings.Based on the view of saving,updating and continuing urban history the charm of a city is tapped and new form of space is re-erected.It is expected that these strategies would be useful for protection,renovation and development of residential buildings.
2011, 41(2): 133-137.
doi: 10.13204/j.gyjz201102031
Abstract:
Based on the analysis of the present status and characteristics of the traditional craft construction-kilns in the Peng Familys upper lanes and alleys of Jingdezhen,this paper points out that people and peoples lives are the foundation and soul for the existence of the lanes and alleys and the kilns,and it also presents to protect and reconstruct them with the dynamic protection method while ensuring the authenticity with the mode of replacement of function so as to revitalize them.
Based on the analysis of the present status and characteristics of the traditional craft construction-kilns in the Peng Familys upper lanes and alleys of Jingdezhen,this paper points out that people and peoples lives are the foundation and soul for the existence of the lanes and alleys and the kilns,and it also presents to protect and reconstruct them with the dynamic protection method while ensuring the authenticity with the mode of replacement of function so as to revitalize them.
