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2008 Vol. 38, No. 11
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2008, 38(11): 1-5.
doi: 10.13204/j.gyjz200811001
Abstract:
The retard-bonded prestressed concrete technique is a newly created prestressed concrete technique that has overcome the shortcomings of the bonded and unbonded prestressed concrete,which is a breakthrough development of prestressed concrete technique.It is reviewed the development of retard-bonded prestressed concrete technique;introduced the research results of this technique at home and abroad,the latest research trend and engineering application;and the research orientation to be further expanded is also pointed out.
The retard-bonded prestressed concrete technique is a newly created prestressed concrete technique that has overcome the shortcomings of the bonded and unbonded prestressed concrete,which is a breakthrough development of prestressed concrete technique.It is reviewed the development of retard-bonded prestressed concrete technique;introduced the research results of this technique at home and abroad,the latest research trend and engineering application;and the research orientation to be further expanded is also pointed out.
2008, 38(11): 6-8,16.
doi: 10.13204/j.gyjz200811002
Abstract:
According to the technical characters of retard-bonded prestressing strand,it was developed the special adhesive materials conforming to the requirements of retard-bonded prestressed concrete technique,then further tested the physical and chemical properties,analyzed the unique attributes of adhesive.The result indicates that the adhesive has good performance index.At the same time,it was analyzed the solidifying process and anti-confusion capacity by the performance characteristics of the retard-cohesive adhesive,and defined the effect of temperature on solidifying time and that of filling on anti-confusion capacity.
According to the technical characters of retard-bonded prestressing strand,it was developed the special adhesive materials conforming to the requirements of retard-bonded prestressed concrete technique,then further tested the physical and chemical properties,analyzed the unique attributes of adhesive.The result indicates that the adhesive has good performance index.At the same time,it was analyzed the solidifying process and anti-confusion capacity by the performance characteristics of the retard-cohesive adhesive,and defined the effect of temperature on solidifying time and that of filling on anti-confusion capacity.
2008, 38(11): 9-12,35.
doi: 10.13204/j.gyjz200811003
Abstract:
It has been conducted a series of special studies on mechanical properties of the retard-cohesive adhesive,tested tensile strength value and flexural strength value of retard-cohesive adhesive and intensity changing value during solidifying process,educed the modulus of elasticity and Poisson's ratio of adhesive material.Through testing different batches of samples,the results indicate that the adhesive has good mechanical properties,also has the requirements as the core media for retard-bonded prestressed concrete technology,and has a mechanical effect being on a par with bonded one.
It has been conducted a series of special studies on mechanical properties of the retard-cohesive adhesive,tested tensile strength value and flexural strength value of retard-cohesive adhesive and intensity changing value during solidifying process,educed the modulus of elasticity and Poisson's ratio of adhesive material.Through testing different batches of samples,the results indicate that the adhesive has good mechanical properties,also has the requirements as the core media for retard-bonded prestressed concrete technology,and has a mechanical effect being on a par with bonded one.
2008, 38(11): 13-16.
doi: 10.13204/j.gyjz200811004
Abstract:
It was researched the stability of the mechanical performance for the adhesive,tested the tensile and compressive strength of adhesive material in different curing cycle,different temperature,salt spray conditions,hot and humid conditions and artificial accelerated aging conditions.The results confirmed the stability of the mechanical performance for the adhesive,which would meet the use of retard-bonded prestressing strands under different environmental conditions and create conditions for the application of retard-bonded prestressed concrete technology.
It was researched the stability of the mechanical performance for the adhesive,tested the tensile and compressive strength of adhesive material in different curing cycle,different temperature,salt spray conditions,hot and humid conditions and artificial accelerated aging conditions.The results confirmed the stability of the mechanical performance for the adhesive,which would meet the use of retard-bonded prestressing strands under different environmental conditions and create conditions for the application of retard-bonded prestressed concrete technology.
2008, 38(11): 17-19,44.
doi: 10.13204/j.gyjz200811005
Abstract:
It is studied the preparation technics deeply based on the performance characters of adhesive materials,then put forward the solution to every influencing factor during the preparation process,and described the environment control of preparation process.At the same time,it is also developed the coating system equipment,the cooling equipment and the scratch equipment suitable for the processing of retard-bonded prestressing strand,which provides the equipment guarantee to the production of retard-bonded prestressing strand.
It is studied the preparation technics deeply based on the performance characters of adhesive materials,then put forward the solution to every influencing factor during the preparation process,and described the environment control of preparation process.At the same time,it is also developed the coating system equipment,the cooling equipment and the scratch equipment suitable for the processing of retard-bonded prestressing strand,which provides the equipment guarantee to the production of retard-bonded prestressing strand.
2008, 38(11): 20-23.
doi: 10.13204/j.gyjz200811006
Abstract:
Through experimental study of 12 retard-cohesive prestressing strands of straight line and 15 retard-cohesive prestressing strands of different angles,the friction loss of each strand is obtained.The friction coefficient and and the separate degree of the retard-cohesive prestressing strand have been figured out,which provides a reference for design and construction of retard-bonded prestressed concrete structures.
Through experimental study of 12 retard-cohesive prestressing strands of straight line and 15 retard-cohesive prestressing strands of different angles,the friction loss of each strand is obtained.The friction coefficient and and the separate degree of the retard-cohesive prestressing strand have been figured out,which provides a reference for design and construction of retard-bonded prestressed concrete structures.
2008, 38(11): 24-27.
doi: 10.13204/j.gyjz200811007
Abstract:
The structure and the working principle of the retard-bonded prestressing tendon were introduced.The cracking moments,ultimate moments,crack distribution and load-deflection graphs of retard-bonded post prestressed concrete beams were studied through the experiment of 3 beams.The experimental results were compared with the theoretical and experimental results of bonded and un-bonded prestressed concrete beams,by which the bending law of retard-bonded post prestressed concrete beam was obtained and can be referenced in the designing of retard-bonded post prestressed concrete beams.
The structure and the working principle of the retard-bonded prestressing tendon were introduced.The cracking moments,ultimate moments,crack distribution and load-deflection graphs of retard-bonded post prestressed concrete beams were studied through the experiment of 3 beams.The experimental results were compared with the theoretical and experimental results of bonded and un-bonded prestressed concrete beams,by which the bending law of retard-bonded post prestressed concrete beam was obtained and can be referenced in the designing of retard-bonded post prestressed concrete beams.
2008, 38(11): 28-30.
doi: 10.13204/j.gyjz200811008
Abstract:
It is introduced the application of retard-bonded prestressed technique to high-level structure of large-span slabs of Lihong Ecology Homeland project,put forward the design method and construction craft of retard-bonded prestressed concrete plate,and pointed out that the matters needing attention in construction of retard-bonded prestressed concrete technique.According to the practice,it is concluded that the control over the curing time and pull-time of relief binder is the most critical issue in retard-bonded prestressed concrete construction process.Which can give a reference for retard-bonded prestressed concrete construction
It is introduced the application of retard-bonded prestressed technique to high-level structure of large-span slabs of Lihong Ecology Homeland project,put forward the design method and construction craft of retard-bonded prestressed concrete plate,and pointed out that the matters needing attention in construction of retard-bonded prestressed concrete technique.According to the practice,it is concluded that the control over the curing time and pull-time of relief binder is the most critical issue in retard-bonded prestressed concrete construction process.Which can give a reference for retard-bonded prestressed concrete construction
2008, 38(11): 31-35.
doi: 10.13204/j.gyjz200811009
Abstract:
The design method of retard-bonded prestressing bar is introduced in No.1 building of Beijing Children's New Palace,which is an irregular slab-column and shear wall structure.The direction of cored pipe as well as reinforcing and prestressing bars are decided based on the primary internal force direction of solid shell and a convenient construction is also taken into account.The internal force of cored slab is simulated with multi-ribbed plate,and the reinforcement along rib is calculated based on the results of multi-ribbed plate.The retard-bonded prestressing technique is applied to the earthquake sensitive area to improve the earthquake resistance ability of the structure
The design method of retard-bonded prestressing bar is introduced in No.1 building of Beijing Children's New Palace,which is an irregular slab-column and shear wall structure.The direction of cored pipe as well as reinforcing and prestressing bars are decided based on the primary internal force direction of solid shell and a convenient construction is also taken into account.The internal force of cored slab is simulated with multi-ribbed plate,and the reinforcement along rib is calculated based on the results of multi-ribbed plate.The retard-bonded prestressing technique is applied to the earthquake sensitive area to improve the earthquake resistance ability of the structure
2008, 38(11): 36-39.
doi: 10.13204/j.gyjz200811010
Abstract:
The application of retard-bonded prestressed technique is introduced in the design of concrete grid-beam structure with the span of 32.4 m33.2 m with irregular boundary condition of Chengde City Museum.The design method of prestressed concrete grid-beam structure is introduced,and the secondary moment of prestressing is calculated according to the balanced loads of prestressing considered in the design.The nominal stresses and ultimate moments of the concrete girders are calculated considering the secondary moments.The design method can be referenced in the designing of retard-bonded prestressed concrete beams especially for that of the grid-beam structures.
The application of retard-bonded prestressed technique is introduced in the design of concrete grid-beam structure with the span of 32.4 m33.2 m with irregular boundary condition of Chengde City Museum.The design method of prestressed concrete grid-beam structure is introduced,and the secondary moment of prestressing is calculated according to the balanced loads of prestressing considered in the design.The nominal stresses and ultimate moments of the concrete girders are calculated considering the secondary moments.The design method can be referenced in the designing of retard-bonded prestressed concrete beams especially for that of the grid-beam structures.
2008, 38(11): 40-44.
doi: 10.13204/j.gyjz200811011
Abstract:
Enterprise culture is the soul of a modern enterprise development,which plays an important role in enterprises.Industrial building is the material carrier of enterprise culture,and the important aspect to establish the enterprise culture,and it has an inseparable relationship with the enterprise culture.It is analysed the relationship between the concept of enterprise culture and its characteristics and industrial building,and then it is also pointed out how to integrate the image design of an industrial building with enterprise culture in order to display enterprise image.
Enterprise culture is the soul of a modern enterprise development,which plays an important role in enterprises.Industrial building is the material carrier of enterprise culture,and the important aspect to establish the enterprise culture,and it has an inseparable relationship with the enterprise culture.It is analysed the relationship between the concept of enterprise culture and its characteristics and industrial building,and then it is also pointed out how to integrate the image design of an industrial building with enterprise culture in order to display enterprise image.
2008, 38(11): 45-48.
doi: 10.13204/j.gyjz200811012
Abstract:
With the expansion of urban area,the distance has been shortened between main urban area and industrial district nearby.Planning design pattern is improved from simply complying interior industrial activities,to a state of combining interior rules with outer orientation of urban design.Principle of urban design is applied in measures for space organization,and new instructional planning pattern will take effect with rapid urbanization
With the expansion of urban area,the distance has been shortened between main urban area and industrial district nearby.Planning design pattern is improved from simply complying interior industrial activities,to a state of combining interior rules with outer orientation of urban design.Principle of urban design is applied in measures for space organization,and new instructional planning pattern will take effect with rapid urbanization
2008, 38(11): 49-51.
doi: 10.13204/j.gyjz200811013
Abstract:
Ecological and energy conservation measures are used in architecture design more and more widely.This essay analyses principles and characteristics in ecological energy conservation buildings design,by reading the relations between courtyard and building.It also has a further research on courtyard's characteristics of functionality and multi-dimension,by taking a case of plant building reconstruction as an example.
Ecological and energy conservation measures are used in architecture design more and more widely.This essay analyses principles and characteristics in ecological energy conservation buildings design,by reading the relations between courtyard and building.It also has a further research on courtyard's characteristics of functionality and multi-dimension,by taking a case of plant building reconstruction as an example.
2008, 38(11): 52-57.
doi: 10.13204/j.gyjz200811014
Abstract:
With the continuous method,the displacement shape functions are constructed with the self-contained trigonometric function series,and then the formulae of normal stress and shear stress in the shear walls of the core tube subjected to a torque are brought forward.Therefore,the formulae of the strain energy in each part of the core tube are obtained.Consequently,the warp displacement values of the key points could be found by the principle of minimum potential energy.Then the torsion displacement,the stresses and the strains of the designated points,and the shear forces in the beams of the core tube will be derived.At last,the validity and high effectiveness of the continuous method are proved by an example,where the results obtained by the method are compared with those obtained by the FEM software ANSYS9.0.Wherefore,the continuous method can be used in the practical engineering
With the continuous method,the displacement shape functions are constructed with the self-contained trigonometric function series,and then the formulae of normal stress and shear stress in the shear walls of the core tube subjected to a torque are brought forward.Therefore,the formulae of the strain energy in each part of the core tube are obtained.Consequently,the warp displacement values of the key points could be found by the principle of minimum potential energy.Then the torsion displacement,the stresses and the strains of the designated points,and the shear forces in the beams of the core tube will be derived.At last,the validity and high effectiveness of the continuous method are proved by an example,where the results obtained by the method are compared with those obtained by the FEM software ANSYS9.0.Wherefore,the continuous method can be used in the practical engineering
2008, 38(11): 58-62.
doi: 10.13204/j.gyjz200811015
Abstract:
Starting from the governing equations of asymmetric consolidation of soil with anisotropic permeability,together with the technique of Fourier expansions,Laplace-Hankel transform with respect to coordinate z,time t and coordinate r,respectively,a linear equations in four is obtained,after solving the equations,the transfer matrix for a single soil layer with anisotropic permeability is first acquired.Based on the continuity and the boundary conditions,the transfer matrix method is utilized to derive the solution for the multi-layered soils with anisotropic permeability in the transform domain.By the inversion of the Laplace-Hankel transform,the solution for consolidation problems of multi-layered soils with anisotropic permeability in the physical domain is obtained.Numerical calculation and analysis are carried out by the computer program,and the effect of anisotropic permeability on the process of soil consolidation is also discussed.
Starting from the governing equations of asymmetric consolidation of soil with anisotropic permeability,together with the technique of Fourier expansions,Laplace-Hankel transform with respect to coordinate z,time t and coordinate r,respectively,a linear equations in four is obtained,after solving the equations,the transfer matrix for a single soil layer with anisotropic permeability is first acquired.Based on the continuity and the boundary conditions,the transfer matrix method is utilized to derive the solution for the multi-layered soils with anisotropic permeability in the transform domain.By the inversion of the Laplace-Hankel transform,the solution for consolidation problems of multi-layered soils with anisotropic permeability in the physical domain is obtained.Numerical calculation and analysis are carried out by the computer program,and the effect of anisotropic permeability on the process of soil consolidation is also discussed.
2008, 38(11): 63-68.
doi: 10.13204/j.gyjz200811016
Abstract:
With a review of disadvantages of traditional deep mixing cement-soil pile techniques,a new type of cement-soil deep mixing technique named T-shaped cement-soil deep mixing pile is introduced.Three-dimensional numerical simulation is taken to analyze the behavior of T-shaped cement-soil deep mixing pile composite foundation under embankment loads comparing with ordinary shaped cement-soil deep mixing pile based on filed tests.The results indicate that when other parameters keep the same,because of the effect of enlarged cap of T-shaped cement-soil deep mixing pile,load sharing ratio of T-shaped cement-soil deep mixing pile is higher than ordinary shaped cement-soil deep mixing pile,but the negative skin friction of T-shaped pile is less than of ordinary pile in the upper reinforced area;additional stress in the upper T-shaped cement-soil deep mixing pile composite foundation is less than that of ordinary cement-soil deep mixing pile composite foundation;comparing to ordinary cement-soil deep mixing pile composite foundation,T-shaped cement-soil deep mixing pile can not only decrease the surface settlement of composite foundation and the lateral displacement in embankment foot,but also can decrease the differential settlement of composite foundation surface efficiently,so there is no need for cushion or geosynthetic-reinforced layer set above the pile top.
With a review of disadvantages of traditional deep mixing cement-soil pile techniques,a new type of cement-soil deep mixing technique named T-shaped cement-soil deep mixing pile is introduced.Three-dimensional numerical simulation is taken to analyze the behavior of T-shaped cement-soil deep mixing pile composite foundation under embankment loads comparing with ordinary shaped cement-soil deep mixing pile based on filed tests.The results indicate that when other parameters keep the same,because of the effect of enlarged cap of T-shaped cement-soil deep mixing pile,load sharing ratio of T-shaped cement-soil deep mixing pile is higher than ordinary shaped cement-soil deep mixing pile,but the negative skin friction of T-shaped pile is less than of ordinary pile in the upper reinforced area;additional stress in the upper T-shaped cement-soil deep mixing pile composite foundation is less than that of ordinary cement-soil deep mixing pile composite foundation;comparing to ordinary cement-soil deep mixing pile composite foundation,T-shaped cement-soil deep mixing pile can not only decrease the surface settlement of composite foundation and the lateral displacement in embankment foot,but also can decrease the differential settlement of composite foundation surface efficiently,so there is no need for cushion or geosynthetic-reinforced layer set above the pile top.
2008, 38(11): 69-74.
doi: 10.13204/j.gyjz200811017
Abstract:
Firstly,the technique principle of Y-shaped vibro-pile is introduced.It is concluded that the skin friction characteristic of both positive circular arc surface and inverse arc surface is basically the same,which is validated by the contrast of static load test between circular pile and Y-shaped vibro-pile.Although the asymmetry is likely,the skin friction of inverse arc surface is not reduced.Combining with the three practical projects,the load bearing characteristics and working mechanism of Y-shaped vibro-pile are studied.The fullness depreciation coefficient is brought forward and analyzed in calculating ultimate bearing capacity aiming at the characteristic of Y-shaped vibro-pile,and its physical meaning and calculation method are also introduced.
Firstly,the technique principle of Y-shaped vibro-pile is introduced.It is concluded that the skin friction characteristic of both positive circular arc surface and inverse arc surface is basically the same,which is validated by the contrast of static load test between circular pile and Y-shaped vibro-pile.Although the asymmetry is likely,the skin friction of inverse arc surface is not reduced.Combining with the three practical projects,the load bearing characteristics and working mechanism of Y-shaped vibro-pile are studied.The fullness depreciation coefficient is brought forward and analyzed in calculating ultimate bearing capacity aiming at the characteristic of Y-shaped vibro-pile,and its physical meaning and calculation method are also introduced.
2008, 38(11): 75-78.
doi: 10.13204/j.gyjz200811018
Abstract:
The fatigue damage properties of pre-stressed concrete specimen were analyzed under the conditions of different number of freeze-thaw cycle.The first-order fatigue load was applied to the concrete structures in the wake of freeze-thaw cycles.Based on the multi-level loading fatigue theory,taking the decay of a relative dynamic elastic modulus as the parameters to set up a multifatigue damage parameter,and using freeze-thaw damage factor k_n to express the effect of the freeze-thaw damage,thus a model of fatigue damage to concrete structures subjected to freeze-thaw cycles was established.The model takes account of the whole specimen injury.The tests show that the error between the calculated damage degree value by the model and that of the test is 16 percent.
The fatigue damage properties of pre-stressed concrete specimen were analyzed under the conditions of different number of freeze-thaw cycle.The first-order fatigue load was applied to the concrete structures in the wake of freeze-thaw cycles.Based on the multi-level loading fatigue theory,taking the decay of a relative dynamic elastic modulus as the parameters to set up a multifatigue damage parameter,and using freeze-thaw damage factor k_n to express the effect of the freeze-thaw damage,thus a model of fatigue damage to concrete structures subjected to freeze-thaw cycles was established.The model takes account of the whole specimen injury.The tests show that the error between the calculated damage degree value by the model and that of the test is 16 percent.
2008, 38(11): 79-81,96.
doi: 10.13204/j.gyjz200811019
Abstract:
The shearing property test of CFRP structure under a static load is conducted.The failure process and the interface intensity are got separately by the analysis of test results of 15 specimens.It is firstly found that the concrete specimens with fiber reinforced interfaces have higher interface intensity than others,whose increments are about 10.6% and 8.6%.
The shearing property test of CFRP structure under a static load is conducted.The failure process and the interface intensity are got separately by the analysis of test results of 15 specimens.It is firstly found that the concrete specimens with fiber reinforced interfaces have higher interface intensity than others,whose increments are about 10.6% and 8.6%.
2008, 38(11): 82-84,74.
doi: 10.13204/j.gyjz200811020
Abstract:
The concrete durability failing with time model(CDFT Model)is used to forecast the service-life of different segments used in the Wuhan Yangtze River tunnel project.The result shows that taking different influencing potential factors into account,the service-life of functionally delaminating system with high impermeability,long service-life and large diameter segment of shield tunnel(HILS)can reach 150 years with the most conservative estimate.And the chloride ion diffusivity is simulated based on finite element method.the result shows that the resistibility towards chloride ion diffusivity of functionally graded system segment is much better than that of composite cementitious material system.
The concrete durability failing with time model(CDFT Model)is used to forecast the service-life of different segments used in the Wuhan Yangtze River tunnel project.The result shows that taking different influencing potential factors into account,the service-life of functionally delaminating system with high impermeability,long service-life and large diameter segment of shield tunnel(HILS)can reach 150 years with the most conservative estimate.And the chloride ion diffusivity is simulated based on finite element method.the result shows that the resistibility towards chloride ion diffusivity of functionally graded system segment is much better than that of composite cementitious material system.
2008, 38(11): 85-88,114.
doi: 10.13204/j.gyjz200811021
Abstract:
The effect of the modified coarse polypropylene fiber-steel fiber on concrete behavior was obtained.The steel fiber with a higher elastic modulus can enhance compressive strength,anti-initial cracking stress and bending strength of concrete;whereas the modified coarse polypro pylene fiber with a lower elastic modulus can improve tough ness and antistrain capacity of concrete.All the behaviors of concrete may be enhance by regulating the mix of the two fibers in concrete,which can make concrete have different behaviors,including anticrack,better bending toughness and fatigue resistance etc.
The effect of the modified coarse polypropylene fiber-steel fiber on concrete behavior was obtained.The steel fiber with a higher elastic modulus can enhance compressive strength,anti-initial cracking stress and bending strength of concrete;whereas the modified coarse polypro pylene fiber with a lower elastic modulus can improve tough ness and antistrain capacity of concrete.All the behaviors of concrete may be enhance by regulating the mix of the two fibers in concrete,which can make concrete have different behaviors,including anticrack,better bending toughness and fatigue resistance etc.
2008, 38(11): 89-92.
doi: 10.13204/j.gyjz200811022
Abstract:
Internal-prestressed reticulated space structure through posttensioning(IRSSP),composed of upper chord,lower chord,web member and lateral support member,is a novel space pre-stressed self-balance structure.The erection of IRSSP into its final configuration is achieved by tensioning prestressing cables passing through the lower chord,which can improve mechanical characteristics of IRSSP.The upper chord of IRSSP is the primary bearing member and the key member in erection and loading process.A detailed study on parameter effect on the loading process is carried out which based on an IRSSP with a long span of 100 m.The parameters include web cross section,web number and rigid arm number etc.The result shows that rigid arm number is the important factors affected the loading process.The structural properties of the loading process affected by the parameters are also given.
Internal-prestressed reticulated space structure through posttensioning(IRSSP),composed of upper chord,lower chord,web member and lateral support member,is a novel space pre-stressed self-balance structure.The erection of IRSSP into its final configuration is achieved by tensioning prestressing cables passing through the lower chord,which can improve mechanical characteristics of IRSSP.The upper chord of IRSSP is the primary bearing member and the key member in erection and loading process.A detailed study on parameter effect on the loading process is carried out which based on an IRSSP with a long span of 100 m.The parameters include web cross section,web number and rigid arm number etc.The result shows that rigid arm number is the important factors affected the loading process.The structural properties of the loading process affected by the parameters are also given.
2008, 38(11): 93-96.
doi: 10.13204/j.gyjz200811023
Abstract:
With the developing of long span structure,more and more attention is paid the influence of wind load on structures.At present,the domestic research on this is just started,especially for the suspended structure,the research on it is much less.The wind load based on numerical simulation methods are widely used in the structural analysis of wind-induced vibration.AR model is applied in wind speed time-history,its rapid and accurate simulation is conducted for the long span structure using mix-programming of VC and Matlab and the integral program of Romberg.Its correctness is proved by Olympic Badminton Gym.The simulation of wind speed time-history has laid a foundation for the analysis of wind-induced vibration of the suspended dome.
With the developing of long span structure,more and more attention is paid the influence of wind load on structures.At present,the domestic research on this is just started,especially for the suspended structure,the research on it is much less.The wind load based on numerical simulation methods are widely used in the structural analysis of wind-induced vibration.AR model is applied in wind speed time-history,its rapid and accurate simulation is conducted for the long span structure using mix-programming of VC and Matlab and the integral program of Romberg.Its correctness is proved by Olympic Badminton Gym.The simulation of wind speed time-history has laid a foundation for the analysis of wind-induced vibration of the suspended dome.
2008, 38(11): 97-101,105.
doi: 10.13204/j.gyjz200811024
Abstract:
Taking two pieces of 1 bay and 2 stories models of concrete-filled RHS(rectangular hollow section)frames as research objects,based on pseudo-static test and considering the effect of steel ratio of the column section,it was researched the behavior of concrete-filled RHS frames in the aspects as:destroy character,loading capacity,hysteretic curves,deformation,energy dissipation,degradation of strength and stiffness;also,it was analyzed the effect of steel ratio of the column section on the forced and seismic behaviors;besides each index was compared with reinforced concrete frame and steel frame separately.The result shows that concrete-filled RHS frame has stronger deformation capacity,plumper shuttle shape hysteretic curves,the excellent ductility and enough later loading capacity,because the frames' ductility coefficient reaches 5.56 to 6.80,also the frame can form the beam hinged collapse mechanism,so the mechanical and seismic behaviors of the frame are excellent,which are superior to those of reinforced concrete frames and steel frames,it is deserved researching thoroughly.
Taking two pieces of 1 bay and 2 stories models of concrete-filled RHS(rectangular hollow section)frames as research objects,based on pseudo-static test and considering the effect of steel ratio of the column section,it was researched the behavior of concrete-filled RHS frames in the aspects as:destroy character,loading capacity,hysteretic curves,deformation,energy dissipation,degradation of strength and stiffness;also,it was analyzed the effect of steel ratio of the column section on the forced and seismic behaviors;besides each index was compared with reinforced concrete frame and steel frame separately.The result shows that concrete-filled RHS frame has stronger deformation capacity,plumper shuttle shape hysteretic curves,the excellent ductility and enough later loading capacity,because the frames' ductility coefficient reaches 5.56 to 6.80,also the frame can form the beam hinged collapse mechanism,so the mechanical and seismic behaviors of the frame are excellent,which are superior to those of reinforced concrete frames and steel frames,it is deserved researching thoroughly.
2008, 38(11): 102-105.
doi: 10.13204/j.gyjz200811025
Abstract:
Through experiment on the T-joint of circular tube under low reversed cycilc loading,the damage form and mechanical performance of T-joint of circular tube has been studied.At the same time,a finite element analysis by ANSYS software was done,whose results are in good agreement with those of the tests.The analytic results show that T-joint has better ductility;the shape of P- curve is stable and full,T-joint has perfect seismic performance.
Through experiment on the T-joint of circular tube under low reversed cycilc loading,the damage form and mechanical performance of T-joint of circular tube has been studied.At the same time,a finite element analysis by ANSYS software was done,whose results are in good agreement with those of the tests.The analytic results show that T-joint has better ductility;the shape of P- curve is stable and full,T-joint has perfect seismic performance.
2008, 38(11): 106-108.
doi: 10.13204/j.gyjz200811026
Abstract:
Fatigue experimental results indicate that the fatigue life of steel structures reinforced with FRP is obviously increased as compared to steel members un-repaired,but the interface at the end of FRP often delaminates between FRP and steel beams.Analysis and simplified analysis models,finite element method are applied to calculate the energy release rate based on the fracture mechanics method,and the measures to prevent the interface from delaminating are put forward.
Fatigue experimental results indicate that the fatigue life of steel structures reinforced with FRP is obviously increased as compared to steel members un-repaired,but the interface at the end of FRP often delaminates between FRP and steel beams.Analysis and simplified analysis models,finite element method are applied to calculate the energy release rate based on the fracture mechanics method,and the measures to prevent the interface from delaminating are put forward.
2008, 38(11): 109-111.
doi: 10.13204/j.gyjz200811027
Abstract:
It is introduced reinforcement method of increasing load effect on the existing structure,and there are no working faces above the structure,the pouring concrete can be done only by compaction method of new construction technology under the beam.This new technology's implementation has opened a new channel for the reinforcement design.
It is introduced reinforcement method of increasing load effect on the existing structure,and there are no working faces above the structure,the pouring concrete can be done only by compaction method of new construction technology under the beam.This new technology's implementation has opened a new channel for the reinforcement design.
2008, 38(11): 112-114.
doi: 10.13204/j.gyjz200811028
Abstract:
It was presented that the factors needing consideration in selecting strengthening schemes of RC crane beams,according to the reconstruction of the crane beam system for a standard member factory;it was also indicated the feasibility of steel-encased scheme by the necessary checked results.
It was presented that the factors needing consideration in selecting strengthening schemes of RC crane beams,according to the reconstruction of the crane beam system for a standard member factory;it was also indicated the feasibility of steel-encased scheme by the necessary checked results.
2008, 38(11): 115-117.
doi: 10.13204/j.gyjz200811029
Abstract:
Nowadays,light-gauge steel residence is a direction of residence development,but it has been scarcely seen in western areas.It is introdued an experimental project of lightweight steel residence in Panzhihua City,it is pointed out that the keys to its design and construction and ways of fireproofing and anticorrosion.And lastly,an economic analysis of the experimental project is also given.
Nowadays,light-gauge steel residence is a direction of residence development,but it has been scarcely seen in western areas.It is introdued an experimental project of lightweight steel residence in Panzhihua City,it is pointed out that the keys to its design and construction and ways of fireproofing and anticorrosion.And lastly,an economic analysis of the experimental project is also given.
2008, 38(11): 118-120,5.
doi: 10.13204/j.gyjz200811030
Abstract:
Based on the current status of housing energy-saving in our countryside,it is expounded the technologies in housing energy conservation.It is pointed out the energy conservation on rural buildings that has become the focus of national attention.According to cases,it is enumerated the energy-saving strategy suitable for the special rural environment.It is proposed the problems of the promotion of energy-saving house at present,and its prospects.
Based on the current status of housing energy-saving in our countryside,it is expounded the technologies in housing energy conservation.It is pointed out the energy conservation on rural buildings that has become the focus of national attention.According to cases,it is enumerated the energy-saving strategy suitable for the special rural environment.It is proposed the problems of the promotion of energy-saving house at present,and its prospects.
2008, 38(11): 121-123.
doi: 10.13204/j.gyjz200811031
Abstract:
Based on the region characteristics of campus,the collection and utilization mode of the landscape water are explored,rainwater and water seepage of underground are collected,purificated and utilizated by ecological mode which not only solves the problem of the store and flow,regulation and storage,and water quality preservation,but also provides a plateform of landscape water and cooling water.During the process,it hopes that ecological ideal is merged into life cycle of landscape,so campus environment and student's quality of life are promoted,experiences of sustainable development construction of water landscape are extended.
Based on the region characteristics of campus,the collection and utilization mode of the landscape water are explored,rainwater and water seepage of underground are collected,purificated and utilizated by ecological mode which not only solves the problem of the store and flow,regulation and storage,and water quality preservation,but also provides a plateform of landscape water and cooling water.During the process,it hopes that ecological ideal is merged into life cycle of landscape,so campus environment and student's quality of life are promoted,experiences of sustainable development construction of water landscape are extended.
