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2008 Vol. 38, No. 12
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2008, 38(12): 1-4.
doi: 10.13204/j.gyjz200812001
Abstract:
Cable net curtain wall is a new structural style.The prestressing construction is one of the most critical links of a curtain wall project. According to the study on the prestressing construction techniques of several typical cable net curtain wall projects,prestress control methods for different sorts of cable net curtain walls are obtained.
Cable net curtain wall is a new structural style.The prestressing construction is one of the most critical links of a curtain wall project. According to the study on the prestressing construction techniques of several typical cable net curtain wall projects,prestress control methods for different sorts of cable net curtain walls are obtained.
2008, 38(12): 5-7.
doi: 10.13204/j.gyjz200812002
Abstract:
The 11th National Games training stadium and mating facilitiesNo.4 building are one of the venues for the 11th National Games,for which large-span string truss structure is used. The accumulation of sliding by block is also used for the project. It is described the construction technology,combined with construction simulation calculation and measured results,the construction technology and characteristics of this structure are proposed,this project will be used for a reference to the construction of similar structures.
The 11th National Games training stadium and mating facilitiesNo.4 building are one of the venues for the 11th National Games,for which large-span string truss structure is used. The accumulation of sliding by block is also used for the project. It is described the construction technology,combined with construction simulation calculation and measured results,the construction technology and characteristics of this structure are proposed,this project will be used for a reference to the construction of similar structures.
2008, 38(12): 8-11.
doi: 10.13204/j.gyjz200812003
Abstract:
The stadium is built for 2008 Indonesian countrywide game.The cable stayed grid structure is used for the stadium.The designd tensile force is gained from the calculation software of Midas/Gen. And the simulation calculation is carried out in detail according to the construction course.The construction courses of steel and cable are introduced.According to character of this project,the construction methods which used front and back cable tension of the same pillar in the same time are provided.The steel stress,the cable force and the distortion are monitored in the course of prestress.According to the construction simulation results,the rationality and correctness of construction monitoring result are proved.
The stadium is built for 2008 Indonesian countrywide game.The cable stayed grid structure is used for the stadium.The designd tensile force is gained from the calculation software of Midas/Gen. And the simulation calculation is carried out in detail according to the construction course.The construction courses of steel and cable are introduced.According to character of this project,the construction methods which used front and back cable tension of the same pillar in the same time are provided.The steel stress,the cable force and the distortion are monitored in the course of prestress.According to the construction simulation results,the rationality and correctness of construction monitoring result are proved.
2008, 38(12): 12-14,25.
doi: 10.13204/j.gyjz200812004
Abstract:
The multifunctional report hall for Beijing North Station is a one-way beam string structure. A lot of construction simulation and plan demonstration are carried out. A truss is installed and the cable is tensioned to 70 percentage of the design force on the ground.After raising and slipping the truss,the prestressing is carried out for the second and third time. The proposed method for the construction of beam string structure. It is not only reasonable in technology,but also can reduce the cost.
The multifunctional report hall for Beijing North Station is a one-way beam string structure. A lot of construction simulation and plan demonstration are carried out. A truss is installed and the cable is tensioned to 70 percentage of the design force on the ground.After raising and slipping the truss,the prestressing is carried out for the second and third time. The proposed method for the construction of beam string structure. It is not only reasonable in technology,but also can reduce the cost.
2008, 38(12): 15-17.
doi: 10.13204/j.gyjz200812005
Abstract:
The roof structure system of the Xiamen Conference and Exhibition Center is a beam string structure,its prestressing construction is very difficult. A minute description of the prestressing construction plan is given. Some first-phase preparations such as the construction simulation calculation and prestressing device design are introduced. The construction monitor plan and the synchronism control measure are briefly accounted.According to the construction simulation results and site construction monitoring result,the features of prestress and steel structure construction of the structure are proposed.
The roof structure system of the Xiamen Conference and Exhibition Center is a beam string structure,its prestressing construction is very difficult. A minute description of the prestressing construction plan is given. Some first-phase preparations such as the construction simulation calculation and prestressing device design are introduced. The construction monitor plan and the synchronism control measure are briefly accounted.According to the construction simulation results and site construction monitoring result,the features of prestress and steel structure construction of the structure are proposed.
2008, 38(12): 18-21.
doi: 10.13204/j.gyjz200812006
Abstract:
F3 building is located at No.3 land block of F district in Beijing Finance Street. One-way beam string structure is used for the roof of the atrium while two-way single-layer cable net curtain wall is used for both sides of its roof. The specialized prestressing construction technology is adopted. According to the deepened design of construction,the simulated result of prestressing construction and site monitoring result during construction,the construction schemes of prestressing and steel structures are finally proposed.
F3 building is located at No.3 land block of F district in Beijing Finance Street. One-way beam string structure is used for the roof of the atrium while two-way single-layer cable net curtain wall is used for both sides of its roof. The specialized prestressing construction technology is adopted. According to the deepened design of construction,the simulated result of prestressing construction and site monitoring result during construction,the construction schemes of prestressing and steel structures are finally proposed.
2008, 38(12): 22-25.
doi: 10.13204/j.gyjz200812007
Abstract:
A prestressed system of space steel structure was used for the gymnasium in Northeast Normal University. It was further demonstrated the successful use of this technology to the project from the prestressing construction simulation and its construction. It was also put forward that the corresponding prestressing construction technology and the features according to the special nature of the structure. The use of this technology was popularized,which provided a basis for its use to other similar projects.
A prestressed system of space steel structure was used for the gymnasium in Northeast Normal University. It was further demonstrated the successful use of this technology to the project from the prestressing construction simulation and its construction. It was also put forward that the corresponding prestressing construction technology and the features according to the special nature of the structure. The use of this technology was popularized,which provided a basis for its use to other similar projects.
2008, 38(12): 26-29.
doi: 10.13204/j.gyjz200812008
Abstract:
The suspended-cable structure is used for the day-lighting ceiling of jinsha site. The structural configuration is a modern design. Structural design and analysis of form-finding are carried out using ANSYS 10.0.The structural forms,member cross sections and the amount of prestressing of the string structure are determined through synthetic analysis.On this basis,the behaviors of the BSS during the construction period and the serviceability phases are analyzed and investigated. According to the constrution monitoring result ,the difference of cable force is analysed after prestressing tension and glazed work.The methods of structural design and construction are proposed. Which may be a reference for other similar projects.
The suspended-cable structure is used for the day-lighting ceiling of jinsha site. The structural configuration is a modern design. Structural design and analysis of form-finding are carried out using ANSYS 10.0.The structural forms,member cross sections and the amount of prestressing of the string structure are determined through synthetic analysis.On this basis,the behaviors of the BSS during the construction period and the serviceability phases are analyzed and investigated. According to the constrution monitoring result ,the difference of cable force is analysed after prestressing tension and glazed work.The methods of structural design and construction are proposed. Which may be a reference for other similar projects.
2008, 38(12): 30-32,21.
doi: 10.13204/j.gyjz200812009
Abstract:
Beijing Workers' Stadium was reinforced for the first time in 1986,after long application and effect of temperature stress,there were some cracks on partial inclined beams near the joints of beam and column. For the second reform,external prestressing is used for strengthening the beams. It is introduced the structural system of prestressed concrete members using external prestressing in the inclined beam of the Beijing Workers' Stadium,the principle of determining the prestressing force and the design of the deflector block;as well as the construction process and construction technology. Which shows the superiority of external prestressing strengthening.
Beijing Workers' Stadium was reinforced for the first time in 1986,after long application and effect of temperature stress,there were some cracks on partial inclined beams near the joints of beam and column. For the second reform,external prestressing is used for strengthening the beams. It is introduced the structural system of prestressed concrete members using external prestressing in the inclined beam of the Beijing Workers' Stadium,the principle of determining the prestressing force and the design of the deflector block;as well as the construction process and construction technology. Which shows the superiority of external prestressing strengthening.
2008, 38(12): 33-36.
doi: 10.13204/j.gyjz200812010
Abstract:
It was analysed the multiple value of an industrial heritage region. It was also introduced the reformation of the foreign industrial heritage regions and protecting ways. Which provided some references for the protection,planning and design of industrial heritage regions in China
It was analysed the multiple value of an industrial heritage region. It was also introduced the reformation of the foreign industrial heritage regions and protecting ways. Which provided some references for the protection,planning and design of industrial heritage regions in China
2008, 38(12): 37-40.
doi: 10.13204/j.gyjz200812011
Abstract:
Planning and construction of industrial parks play a crucial role in a city's sustainable development. It is explored that study the industry rooted nurturing faced with by the planning of an ecological park,sustainable buildings,design,which is put into and practice with a case of Huangjinshan Industrial Park's site planning under the conception of sustainable development.
Planning and construction of industrial parks play a crucial role in a city's sustainable development. It is explored that study the industry rooted nurturing faced with by the planning of an ecological park,sustainable buildings,design,which is put into and practice with a case of Huangjinshan Industrial Park's site planning under the conception of sustainable development.
2008, 38(12): 41-43,68.
doi: 10.13204/j.gyjz200812012
Abstract:
According to a discussion on the vertical loading and creep,it was elaborated the effect of vertical deformation difference of a structure on internal force redistribution,it was analysed the differences between the different vertical loadings,applicable scope and matters needing attention. It was analyzed the differences between the creep deformation and forced-deformation and thier impact on structural and non-structural components. The combined consideration on the force,calculation the structure of selection,material selection and structural measures was the countermeasure to solve the vertical deformations difference.
According to a discussion on the vertical loading and creep,it was elaborated the effect of vertical deformation difference of a structure on internal force redistribution,it was analysed the differences between the different vertical loadings,applicable scope and matters needing attention. It was analyzed the differences between the creep deformation and forced-deformation and thier impact on structural and non-structural components. The combined consideration on the force,calculation the structure of selection,material selection and structural measures was the countermeasure to solve the vertical deformations difference.
2008, 38(12): 44-48.
doi: 10.13204/j.gyjz200812013
Abstract:
Lately,the static pushover analysis has become a simplified computer method for evaluating aseismic capacity of a structure. It is reviewed that the basic principles and methods of the static pushover analysis.Its main calculation procedure are summarized according to China code for seismic design by means of SAP 2000,based on which,the method is applied to pushover analysis of prestressed concrete frame structure.The results acquired are contrasted with those got by pseudostatic experiment. Some proposals for design are given
Lately,the static pushover analysis has become a simplified computer method for evaluating aseismic capacity of a structure. It is reviewed that the basic principles and methods of the static pushover analysis.Its main calculation procedure are summarized according to China code for seismic design by means of SAP 2000,based on which,the method is applied to pushover analysis of prestressed concrete frame structure.The results acquired are contrasted with those got by pseudostatic experiment. Some proposals for design are given
2008, 38(12): 49-53.
doi: 10.13204/j.gyjz200812014
Abstract:
The lateral performance of the main structure of core-tube suspended vibration absorption system is analyzed. The results show that the lateral displacement when considering coupling effect will possibly be twice as that without coupling effect consideration while the overturning moment almost keeps the constant value. When the first order frequency 1 of the suspended system is invariant,the displacement amplitude of the structure is affected remarkably by the damping ratio 1 of the superstructure and the stimulation frequency ratio . The nominal height-to-width ratios of the main structure of hexagonal core-tube suspended vibration absorption system under different seismic fortification intensities are derived. In the 9-degree seismic zone the height-to-width ratio is small,so the single-core-tube suspended building is not preferred,but other types of suspended system,for example,the mega-frame suspended system,can be slected.
The lateral performance of the main structure of core-tube suspended vibration absorption system is analyzed. The results show that the lateral displacement when considering coupling effect will possibly be twice as that without coupling effect consideration while the overturning moment almost keeps the constant value. When the first order frequency 1 of the suspended system is invariant,the displacement amplitude of the structure is affected remarkably by the damping ratio 1 of the superstructure and the stimulation frequency ratio . The nominal height-to-width ratios of the main structure of hexagonal core-tube suspended vibration absorption system under different seismic fortification intensities are derived. In the 9-degree seismic zone the height-to-width ratio is small,so the single-core-tube suspended building is not preferred,but other types of suspended system,for example,the mega-frame suspended system,can be slected.
2008, 38(12): 54-59.
doi: 10.13204/j.gyjz200812015
Abstract:
A total of 9 tests were conducted on three kinds of full scale beam-column connections,including tooth-grooved connection,sticking steel plate welded angle iron connection and roughened interface with inserting bent-up bars connection. It was confirmed that the roughened interface connections had better performance,its strength was up to the strength of integral casting beams. It was also discussed the shear behavior and mechanism of the three kinds of connections. The formulas to calculate the shear capacity of connections were proposed,it is shown that the theoretical values were in good agreement with those of the test,and they could be used as reference in engineering practice.
A total of 9 tests were conducted on three kinds of full scale beam-column connections,including tooth-grooved connection,sticking steel plate welded angle iron connection and roughened interface with inserting bent-up bars connection. It was confirmed that the roughened interface connections had better performance,its strength was up to the strength of integral casting beams. It was also discussed the shear behavior and mechanism of the three kinds of connections. The formulas to calculate the shear capacity of connections were proposed,it is shown that the theoretical values were in good agreement with those of the test,and they could be used as reference in engineering practice.
2008, 38(12): 60-64.
doi: 10.13204/j.gyjz200812016
Abstract:
Based on the previous experimental research,the shear mechanism of yield hinge regions of the reinforced concrete shear wall is studied by a truss-arch model. It is brought in the effective coefficient of concrete strength with considering the axial load ratio and analyzed the influence of some factors on the shear capacity of the shear wall,such as the ultimate rotation of the cross-section of shear wall,the horizontal distribution reinforcement,the truss,the inclination angle of the arch model and others. On this basis,the shear capacity calculation formula of the yield hinge regions of the shear wall is put forward. Theoretical research and test analysis show that the shear capacity calculation formula of the shear wall which based on the truss-arch model are both valuable for theoretical analysis and practical application,and can meet practical engineering.
Based on the previous experimental research,the shear mechanism of yield hinge regions of the reinforced concrete shear wall is studied by a truss-arch model. It is brought in the effective coefficient of concrete strength with considering the axial load ratio and analyzed the influence of some factors on the shear capacity of the shear wall,such as the ultimate rotation of the cross-section of shear wall,the horizontal distribution reinforcement,the truss,the inclination angle of the arch model and others. On this basis,the shear capacity calculation formula of the yield hinge regions of the shear wall is put forward. Theoretical research and test analysis show that the shear capacity calculation formula of the shear wall which based on the truss-arch model are both valuable for theoretical analysis and practical application,and can meet practical engineering.
2008, 38(12): 65-68.
doi: 10.13204/j.gyjz200812017
Abstract:
In the process of concrete structure design,minimum reinforcement ratio and crack width are two requirements needing to be satisfied simultaneously. An axial tension member in a project is analyzed to indicate that the advised value of the minimum reinforcement ratio is incompatible with the crack control requirements in the current concrete design criteria. In this study,the reason of this phenomenon is found out and a suggested value of the minimum reinforcement ratio considering the crack width requirements is proposed,which makes sure that the axial tension member will not only not break suddenly but also satisfy crack control requirements once it has the first crack.
In the process of concrete structure design,minimum reinforcement ratio and crack width are two requirements needing to be satisfied simultaneously. An axial tension member in a project is analyzed to indicate that the advised value of the minimum reinforcement ratio is incompatible with the crack control requirements in the current concrete design criteria. In this study,the reason of this phenomenon is found out and a suggested value of the minimum reinforcement ratio considering the crack width requirements is proposed,which makes sure that the axial tension member will not only not break suddenly but also satisfy crack control requirements once it has the first crack.
2008, 38(12): 69-71.
doi: 10.13204/j.gyjz200812018
Abstract:
The results from the consolidated drained triaxial compression tests on the municipal solid waste (MSW) with four kinds of compositions,have shown the relation curves of pore water pressures and times and axial strains. The pore water pressures that exist in MSW and soil are different. The distributing of pore water pressure of MSW is very complex. The pore water pressure exist in pore,on impervious materials and in organic matter. It is nonlinear distributing and discontinuous along the depth. So,the application of principle of effective stress of soil mechanic is unsuitable here. It is suggested that the consolidation of MSW should not be considered and the settlement of MSW should be divided into compression and biological decomposition.
The results from the consolidated drained triaxial compression tests on the municipal solid waste (MSW) with four kinds of compositions,have shown the relation curves of pore water pressures and times and axial strains. The pore water pressures that exist in MSW and soil are different. The distributing of pore water pressure of MSW is very complex. The pore water pressure exist in pore,on impervious materials and in organic matter. It is nonlinear distributing and discontinuous along the depth. So,the application of principle of effective stress of soil mechanic is unsuitable here. It is suggested that the consolidation of MSW should not be considered and the settlement of MSW should be divided into compression and biological decomposition.
2008, 38(12): 72-75.
doi: 10.13204/j.gyjz200812019
Abstract:
The approximate displacement solution has been provided for non-homogeneous soil mass,whose elastic modulus increases linearly with depth,which is subjected to a circular of vertical uniform load. The accuracy of this solution has been verified through comparison with that of Gibson soil,homogeneous soil and finite element approach. In addition,the effects of Poisson's ratio and degree of non-homogeneity on vertical displacement are discussed.
The approximate displacement solution has been provided for non-homogeneous soil mass,whose elastic modulus increases linearly with depth,which is subjected to a circular of vertical uniform load. The accuracy of this solution has been verified through comparison with that of Gibson soil,homogeneous soil and finite element approach. In addition,the effects of Poisson's ratio and degree of non-homogeneity on vertical displacement are discussed.
2008, 38(12): 76-79.
doi: 10.13204/j.gyjz200812020
Abstract:
Usig the basic theory of particle flow code (PFC),based on PFC2D procedure of the discrete unit method,it is established a model of soft soil particle flow to simulate the contact stress field and displacement field of the filled slope of a soft soil roadbed,as well as the effect of using gravel piles on reinforcing the slope. In the analysis,macroscopic continuous supposition of the traditional continuous medium model is overcome;it is studied and compared the change in the displacement field of the shope during slip before and after being strengthened by the gravel piles,as well as the effects of different pile diameter,space and length of the gravel piles. The results show that pile length has an obvious influence on the antislip capacity,i.e. the capacity of a gravel pile is improved evidently with its length increases. The gravel piles with different diameters have different capacities of antislip,i.e. with an increase in pile diameter antislip capacity is also raised. The influence of a pile space on the antislip capacity should be determined according to the optimization of a pile diameter,so as to use the co-action of pile and soil.
Usig the basic theory of particle flow code (PFC),based on PFC2D procedure of the discrete unit method,it is established a model of soft soil particle flow to simulate the contact stress field and displacement field of the filled slope of a soft soil roadbed,as well as the effect of using gravel piles on reinforcing the slope. In the analysis,macroscopic continuous supposition of the traditional continuous medium model is overcome;it is studied and compared the change in the displacement field of the shope during slip before and after being strengthened by the gravel piles,as well as the effects of different pile diameter,space and length of the gravel piles. The results show that pile length has an obvious influence on the antislip capacity,i.e. the capacity of a gravel pile is improved evidently with its length increases. The gravel piles with different diameters have different capacities of antislip,i.e. with an increase in pile diameter antislip capacity is also raised. The influence of a pile space on the antislip capacity should be determined according to the optimization of a pile diameter,so as to use the co-action of pile and soil.
2008, 38(12): 80-83.
doi: 10.13204/j.gyjz200812021
Abstract:
The field tests on new precast circular-plate pile caps in the CFG pile composite foundation of high-speed railway were carried out. The results show that the bearing capacity of pile caps is dependent on their flexural behavior. The flexural cracks develop in diameter directions on the top surfaces of the caps,while extend downwards on the side faces,with wide upper part and narrow lower part. The calculated flexural cracking loads are consistent with the field test results,which indicates that the FLAC model and the simplified method in this paper are effective. All of the four types of pile caps can satisfy the load-bearing capacity requirements,and the safety factors are 1.33,1.76,2.38 and 3.11,respectively.
The field tests on new precast circular-plate pile caps in the CFG pile composite foundation of high-speed railway were carried out. The results show that the bearing capacity of pile caps is dependent on their flexural behavior. The flexural cracks develop in diameter directions on the top surfaces of the caps,while extend downwards on the side faces,with wide upper part and narrow lower part. The calculated flexural cracking loads are consistent with the field test results,which indicates that the FLAC model and the simplified method in this paper are effective. All of the four types of pile caps can satisfy the load-bearing capacity requirements,and the safety factors are 1.33,1.76,2.38 and 3.11,respectively.
2008, 38(12): 84-87.
doi: 10.13204/j.gyjz200812022
Abstract:
The durability design method of concrete structure under carbonation is studied based on structure reliability in this article. First the durability limit state and the reliability target are defined corresponding to carbonation. Second the failure probability expression of designed service life is established with adoption of proper prediction model of carbonation depth. Finally the durability indexes of structure and material are comprehensively determined under the request of service life. Some application examples are provided comparatively under different environmental conditions also.
The durability design method of concrete structure under carbonation is studied based on structure reliability in this article. First the durability limit state and the reliability target are defined corresponding to carbonation. Second the failure probability expression of designed service life is established with adoption of proper prediction model of carbonation depth. Finally the durability indexes of structure and material are comprehensively determined under the request of service life. Some application examples are provided comparatively under different environmental conditions also.
2008, 38(12): 88-91.
doi: 10.13204/j.gyjz200812023
Abstract:
Experimental study on 9 corroded reinforcement concrete beams with cantilevers at both supports in atmospheric environment is carried out. It is easier for the stirrup to corrode than longitudinal steel bars. Plane sections of corroded R.C. beams before bending remain plane after bending when the corrosion rate is lower than 5%. There is no obvious yielding point in corroded R.C. beams. The decrease of bonding capacity between concrete and corroded re-bars induces the decrease of beam rigidity and increase of average distance between cracks. The loss of load carrying capacity of corroded R.C. beams with more longitudinal cracks and wider cracks is greater than those with less longitudinal cracks and narrower cracks. The loss of the load carrying capacity of corroded R C beams in the positive-moment zone and the negative-moment zone is about 1.7 to 2.5 times and one times of the corrosion rate.
Experimental study on 9 corroded reinforcement concrete beams with cantilevers at both supports in atmospheric environment is carried out. It is easier for the stirrup to corrode than longitudinal steel bars. Plane sections of corroded R.C. beams before bending remain plane after bending when the corrosion rate is lower than 5%. There is no obvious yielding point in corroded R.C. beams. The decrease of bonding capacity between concrete and corroded re-bars induces the decrease of beam rigidity and increase of average distance between cracks. The loss of load carrying capacity of corroded R.C. beams with more longitudinal cracks and wider cracks is greater than those with less longitudinal cracks and narrower cracks. The loss of the load carrying capacity of corroded R C beams in the positive-moment zone and the negative-moment zone is about 1.7 to 2.5 times and one times of the corrosion rate.
2008, 38(12): 92-95.
doi: 10.13204/j.gyjz200812024
Abstract:
The stress,strain and internal forces in possible destroyed sections of reinforced concrete members in fire are analyzed and the ultimate bearing capability program is compiled. The method of numerical calculation is proposed and the section ultimate bearing capability of reinforced members in fire at any time can be obtained by the above method and program. The mutual action relationship of ultimate bearing capability of concrete frame beam and column subjected to uniform fire are analyzed and discussed. The ductility principle of strong column with weak beam in uniform fire resistant design is proposed,which provides reference for collapse-resistant and anti-fire design.
The stress,strain and internal forces in possible destroyed sections of reinforced concrete members in fire are analyzed and the ultimate bearing capability program is compiled. The method of numerical calculation is proposed and the section ultimate bearing capability of reinforced members in fire at any time can be obtained by the above method and program. The mutual action relationship of ultimate bearing capability of concrete frame beam and column subjected to uniform fire are analyzed and discussed. The ductility principle of strong column with weak beam in uniform fire resistant design is proposed,which provides reference for collapse-resistant and anti-fire design.
2008, 38(12): 96-98,123.
doi: 10.13204/j.gyjz200812025
Abstract:
Based on plenty of experiment results,the effect of curing period of specimens,volume content of polypropylene fiber and cement content on compressive resilient modulus of cement stabilized macadam is analyzed,and the corresponding influencing rules are drawn. The study results indicate that the addition of polypropylene fiber can decrease the compressive resilient modulus of cement stabilized macadam evidently. The compressive resilient modulus is increasing with the increase of curing period. Within the range of the fiber content in this study (the volume content 1),there is a tendency of decrease in compressive resilient modulus with the increase of polypropylene fiber volume content. With the increase of cement content,the compressive resilient modulus of cement stabilized macadam is increasing linearly.
Based on plenty of experiment results,the effect of curing period of specimens,volume content of polypropylene fiber and cement content on compressive resilient modulus of cement stabilized macadam is analyzed,and the corresponding influencing rules are drawn. The study results indicate that the addition of polypropylene fiber can decrease the compressive resilient modulus of cement stabilized macadam evidently. The compressive resilient modulus is increasing with the increase of curing period. Within the range of the fiber content in this study (the volume content 1),there is a tendency of decrease in compressive resilient modulus with the increase of polypropylene fiber volume content. With the increase of cement content,the compressive resilient modulus of cement stabilized macadam is increasing linearly.
2008, 38(12): 99-101,87.
doi: 10.13204/j.gyjz200812026
Abstract:
The influence rules of some factors,such as initial bond length of fiber,surface impregnating treatment of fiber,prestressing force on bond performance were studied on the basis of pull-out tests.The tests results show that with initial bond length increasing,the maximum pull force increases and carbon fiber epoxy impregnating and prestresssing can improve the bond performance between carbon fiber and concrete.
The influence rules of some factors,such as initial bond length of fiber,surface impregnating treatment of fiber,prestressing force on bond performance were studied on the basis of pull-out tests.The tests results show that with initial bond length increasing,the maximum pull force increases and carbon fiber epoxy impregnating and prestresssing can improve the bond performance between carbon fiber and concrete.
2008, 38(12): 102-105.
doi: 10.13204/j.gyjz200812027
Abstract:
In this paper,a rectangular unit of steel roof in Zhengzhou International Conference Exhibition Center is taken as example and the response spectrum method and time-history method are respectively adopted to explore seismic performances. Geometry nonlinearity and pre-tensions are included in analysis,and the damping ratio and contribution of the former fifty modes are considered. The dynamic actions under horizontal earthquake and vertical earthquake are analyzed. The results indicate that 1) the vertical earthquake action must be taken into account during the process of seismic design; 2) the rules of earthquake action can be gained by means of response spectrum method; 3) it is necessary to carry the time-history analysis for big-span structures; 4) the masts are primary structural load-bearing members,The above analysis can provide a basis of further design and research for this new type of structures.
In this paper,a rectangular unit of steel roof in Zhengzhou International Conference Exhibition Center is taken as example and the response spectrum method and time-history method are respectively adopted to explore seismic performances. Geometry nonlinearity and pre-tensions are included in analysis,and the damping ratio and contribution of the former fifty modes are considered. The dynamic actions under horizontal earthquake and vertical earthquake are analyzed. The results indicate that 1) the vertical earthquake action must be taken into account during the process of seismic design; 2) the rules of earthquake action can be gained by means of response spectrum method; 3) it is necessary to carry the time-history analysis for big-span structures; 4) the masts are primary structural load-bearing members,The above analysis can provide a basis of further design and research for this new type of structures.
2008, 38(12): 106-109.
doi: 10.13204/j.gyjz200812028
Abstract:
According to reinforcement and construction of a structure after serious fire,the inspection result and reinforcement methods are introduced,and the force acting on the structure in construction process is analyzed based on the monitoring data of strengthening construction,the practice shows that good effects are obtained. The reinforcement methods and some successful experience may be used for similar projects in the future.
According to reinforcement and construction of a structure after serious fire,the inspection result and reinforcement methods are introduced,and the force acting on the structure in construction process is analyzed based on the monitoring data of strengthening construction,the practice shows that good effects are obtained. The reinforcement methods and some successful experience may be used for similar projects in the future.
2008, 38(12): 110-112.
doi: 10.13204/j.gyjz200812029
Abstract:
It was presented the use of virtual column method to the calculation of RC bent frames with columns removed according to the apprasial of a large metallurgical mill building; it was also analyzed the changes in the internal forces and displacement,as well as the effect of virtual column stiffness on the internal forces and displacement of bent frames,using specific methods for determining virtual column sections in virtual column method and the one of how to equate a steel roof truss to a solid web beam.
It was presented the use of virtual column method to the calculation of RC bent frames with columns removed according to the apprasial of a large metallurgical mill building; it was also analyzed the changes in the internal forces and displacement,as well as the effect of virtual column stiffness on the internal forces and displacement of bent frames,using specific methods for determining virtual column sections in virtual column method and the one of how to equate a steel roof truss to a solid web beam.
2008, 38(12): 113-116.
doi: 10.13204/j.gyjz200812030
Abstract:
Ten timber columns strengthened with CFRP strips and AFRP bars were tested and effective factors such as shape and layer of CFRP strips,layout of AFRP rods were studied. The ultimate load-bearing capacities of timber columns with CFRP strips are increased by about 7.6%～26.1% over the control specimen,and the ductility performance also has a significant betterment. The ultimate load-bearing capacities of timber columns with AFRP rods have 17.7%～41.5% increases over the control specimen,and after wrapped with CFRP strips,the ductility has an obvious improvement. Based on the experimental research,the strength mode of timber columns strengthened with CFRP strip was proposed,and the effective confined coefficient k1 was linearly regressed. Strengthened timber column with CFRP is a valid method,and it can be used for strengthening of timber structures.
Ten timber columns strengthened with CFRP strips and AFRP bars were tested and effective factors such as shape and layer of CFRP strips,layout of AFRP rods were studied. The ultimate load-bearing capacities of timber columns with CFRP strips are increased by about 7.6%～26.1% over the control specimen,and the ductility performance also has a significant betterment. The ultimate load-bearing capacities of timber columns with AFRP rods have 17.7%～41.5% increases over the control specimen,and after wrapped with CFRP strips,the ductility has an obvious improvement. Based on the experimental research,the strength mode of timber columns strengthened with CFRP strip was proposed,and the effective confined coefficient k1 was linearly regressed. Strengthened timber column with CFRP is a valid method,and it can be used for strengthening of timber structures.
2008, 38(12): 117-119,105.
doi: 10.13204/j.gyjz200812031
Abstract:
In Taian City of Shandong Province,the retaining wall of Gaoyupu Cross Bridge on No.205 National Highway is located on an unstable slope subjected to double dynamic loading,one is the vehicles running on the highway on the top of the slope,and the other is the train trucks acting on the bottom of the slope. On this condition,the whole slope and retaining wall lose their stability,which threatens the railway,and half range of the road was interrupted. According to characteristic of this engineering disaster,it is deeply studied the mechanism of the retaining wall instability and its reinforcing scheme,and good effect are obtained
In Taian City of Shandong Province,the retaining wall of Gaoyupu Cross Bridge on No.205 National Highway is located on an unstable slope subjected to double dynamic loading,one is the vehicles running on the highway on the top of the slope,and the other is the train trucks acting on the bottom of the slope. On this condition,the whole slope and retaining wall lose their stability,which threatens the railway,and half range of the road was interrupted. According to characteristic of this engineering disaster,it is deeply studied the mechanism of the retaining wall instability and its reinforcing scheme,and good effect are obtained
2008, 38(12): 120-123.
doi: 10.13204/j.gyjz200812032
Abstract:
Starting from the theory and concept of solar house,it was analyzed the feasibility and design method of passive solar house. Which were expounded from the economy,use of energy sources and status of buildings in northwest area,it was also pointed out that it is feasible to build passive solar house. It was analyzed the the advantage and economic benefit of passive solar house,and the typical design technique has also been given,which provided experience and guidance for popularizing and construction of passive solar houses.
Starting from the theory and concept of solar house,it was analyzed the feasibility and design method of passive solar house. Which were expounded from the economy,use of energy sources and status of buildings in northwest area,it was also pointed out that it is feasible to build passive solar house. It was analyzed the the advantage and economic benefit of passive solar house,and the typical design technique has also been given,which provided experience and guidance for popularizing and construction of passive solar houses.
2008, 38(12): 124-126.
doi: 10.13204/j.gyjz200812033
Abstract:
With the development of society,economy and culture,architectural culture is developing and the field of architecture is expanding gradually. What is the development orientation of architecture and what role will architectural culture heritage protection play under the perplexing architecture phenomena? On the basis of researching the relationship between architecture and architectural culture heritage protection,it is analyzed developing trend of architecture and discussed the role which architectural culture heritage protection will play in the future architecture.
With the development of society,economy and culture,architectural culture is developing and the field of architecture is expanding gradually. What is the development orientation of architecture and what role will architectural culture heritage protection play under the perplexing architecture phenomena? On the basis of researching the relationship between architecture and architectural culture heritage protection,it is analyzed developing trend of architecture and discussed the role which architectural culture heritage protection will play in the future architecture.
