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2009 Vol. 39, No. 1
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2009, 39(1): 1-6,55.
doi: 10.13204/j.gyjz200901001
Abstract:
According to the lessons from Wenchuan earthquake, it was introspected that the problems of urban and rural earthquake disaster prevention, construction of emergency shelters, shock resistant design of buildings and disaster prevention of houses in rural areas in China. It was also introduced the experience in aseismic and disaster prevention of cities in Japan.
According to the lessons from Wenchuan earthquake, it was introspected that the problems of urban and rural earthquake disaster prevention, construction of emergency shelters, shock resistant design of buildings and disaster prevention of houses in rural areas in China. It was also introduced the experience in aseismic and disaster prevention of cities in Japan.
2009, 39(1): 7-15,46.
doi: 10.13204/j.gyjz200901002
Abstract:
The unexpected Strong 5112 Wenchuan earthquake has caused great loss to the Chinese people and their properties. Field investigation on the damages to industrial buildings and equipments as well as loss of persons in Mainyang district was conducted by Chinese Ministry of Industry and Information very soon after the quake. Combining investigations on the damages to the industrial buildings in Mianyang district, it was proposed that some advices on pos-t earthquake repair and retrofitting schemes and the asseismic design of future new buildings.
The unexpected Strong 5112 Wenchuan earthquake has caused great loss to the Chinese people and their properties. Field investigation on the damages to industrial buildings and equipments as well as loss of persons in Mainyang district was conducted by Chinese Ministry of Industry and Information very soon after the quake. Combining investigations on the damages to the industrial buildings in Mianyang district, it was proposed that some advices on pos-t earthquake repair and retrofitting schemes and the asseismic design of future new buildings.
2009, 39(1): 16-19.
doi: 10.13204/j.gyjz200901003
Abstract:
By investigating the Wenchuan earthquake damages to partial buildings, it is proposed that comments and suggestions on design and construction to Enhance the earthquake resistant capacity of industrial buildings.
By investigating the Wenchuan earthquake damages to partial buildings, it is proposed that comments and suggestions on design and construction to Enhance the earthquake resistant capacity of industrial buildings.
2009, 39(1): 20-24,92.
doi: 10.13204/j.gyjz200901004
Abstract:
According to the investigation and analysis on the reinforced concrete frame and bent structures in different regions, of different forms and degrees of damages due to May 12 Wenchuan Earthquake, it has been found out that the majority of serious damages were caused by such structure whose maximum security structure intensity was 1 to 2 degrees below the seismic intensity. Other factors that have caused the collapse include unreasonable design, poor quality construction and so on. Therefore, it is summarized the matters needing attention during design and construction of the structures, which could provide some reference information for engineers, technical personnel and construction personnel.
According to the investigation and analysis on the reinforced concrete frame and bent structures in different regions, of different forms and degrees of damages due to May 12 Wenchuan Earthquake, it has been found out that the majority of serious damages were caused by such structure whose maximum security structure intensity was 1 to 2 degrees below the seismic intensity. Other factors that have caused the collapse include unreasonable design, poor quality construction and so on. Therefore, it is summarized the matters needing attention during design and construction of the structures, which could provide some reference information for engineers, technical personnel and construction personnel.
2009, 39(1): 25-29.
doi: 10.13204/j.gyjz200901005
Abstract:
The RC frame with infill walls constructed with hollow shale tiles and solid clay bricks which are used to divided into the room is a complicated composite structure. Research shows that the infill walls have great effect on the capacity, stiffness, deformation behavior of frames and the dynamic property of the building. However, the seismic code of buildings in China has not clearly indicated the relation between RC frame and infill walls in quantifying way . A lot of RC frames with infill walls were attacked by Wenchuan Earthquake, so damage styles of the RC frames with infill walls varied greatly , which enrich the knowledge about the seismic property of the infilled frames. In the paper, the failure mode of The RC frame with infill walls was introduced. Meanwhile, the failure mechanism of infilled frame was analyzed. Some conclusions and suggestions were put forward in this paper.
The RC frame with infill walls constructed with hollow shale tiles and solid clay bricks which are used to divided into the room is a complicated composite structure. Research shows that the infill walls have great effect on the capacity, stiffness, deformation behavior of frames and the dynamic property of the building. However, the seismic code of buildings in China has not clearly indicated the relation between RC frame and infill walls in quantifying way . A lot of RC frames with infill walls were attacked by Wenchuan Earthquake, so damage styles of the RC frames with infill walls varied greatly , which enrich the knowledge about the seismic property of the infilled frames. In the paper, the failure mode of The RC frame with infill walls was introduced. Meanwhile, the failure mechanism of infilled frame was analyzed. Some conclusions and suggestions were put forward in this paper.
2009, 39(1): 30-35.
doi: 10.13204/j.gyjz200901006
Abstract:
By means of investigation on serious damages and collapses of a large number of masonry structures due to 5. 12 Wenchuan earthquake, it has been found out that the seismic intensity in a hardest hit area was greater than or much greater than the intensity of housing security is the main reason, followed by unreasonable design, poor quality construction and other reasons. It is pointed out that the matters needing attention in the design and construction of the structures, which may be a reference for engineers and construction staff.
By means of investigation on serious damages and collapses of a large number of masonry structures due to 5. 12 Wenchuan earthquake, it has been found out that the seismic intensity in a hardest hit area was greater than or much greater than the intensity of housing security is the main reason, followed by unreasonable design, poor quality construction and other reasons. It is pointed out that the matters needing attention in the design and construction of the structures, which may be a reference for engineers and construction staff.
2009, 39(1): 36-41.
doi: 10.13204/j.gyjz200901007
Abstract:
As the component of electric power system, High??voltage electrical equipments have some traits such as heavy weight, small damp ratio and poor distortion of accessorial parts, which lead to weak aseismatic ability. High??voltage reactors were destroyed badly in 5??12 Wenchuan earthquake, which caused blackout in earthquake reg ion and brought so many difficulties for rebuilding. It is studied the application of isolation technology in high??voltage reactors in a real substation. The isolation layer made of laminated rubber bearing is set under reactors layer. A new type model of simulating high??voltage electrical equipments has been built up successfully to solve the problem of difficult modeling . It is also presented calculation method and analytic steps in a real isolated electric project and compared to the results of non??isolated one. The results show that isolation technology can decrease the seismic reaction of reactors obviously and it's the effective way to enhance aseismatic ability of high??voltage electrical equipments.
As the component of electric power system, High??voltage electrical equipments have some traits such as heavy weight, small damp ratio and poor distortion of accessorial parts, which lead to weak aseismatic ability. High??voltage reactors were destroyed badly in 5??12 Wenchuan earthquake, which caused blackout in earthquake reg ion and brought so many difficulties for rebuilding. It is studied the application of isolation technology in high??voltage reactors in a real substation. The isolation layer made of laminated rubber bearing is set under reactors layer. A new type model of simulating high??voltage electrical equipments has been built up successfully to solve the problem of difficult modeling . It is also presented calculation method and analytic steps in a real isolated electric project and compared to the results of non??isolated one. The results show that isolation technology can decrease the seismic reaction of reactors obviously and it's the effective way to enhance aseismatic ability of high??voltage electrical equipments.
2009, 39(1): 42-46.
doi: 10.13204/j.gyjz200901008
Abstract:
It has been discussed that some problems of aseismic conceptual disign of middle and primary schools' buildings.Such as:layout of plan and elevation of arch :tectural design, choice of soils and foundation structural systems with second garrison, structural material with ductility and using base-isolation technology .Suggestions are worked out .
It has been discussed that some problems of aseismic conceptual disign of middle and primary schools' buildings.Such as:layout of plan and elevation of arch :tectural design, choice of soils and foundation structural systems with second garrison, structural material with ductility and using base-isolation technology .Suggestions are worked out .
2009, 39(1): 47-49,59.
doi: 10.13204/j.gyjz200901009
Abstract:
The earthquake function is the direct reason to result in the damage to brick-concrete structure .Through the site investigation and appraisal after Wenchuan earthquake house authentication, it is analyzed the break characteristic and reason of brick-concrete houses , it is carried out safety appraisal of the dangerous houses, it is put forward reinforcing measure and suggestion on these houses, which is useful to the reform of brick-concrete houses and newly built ones.
The earthquake function is the direct reason to result in the damage to brick-concrete structure .Through the site investigation and appraisal after Wenchuan earthquake house authentication, it is analyzed the break characteristic and reason of brick-concrete houses , it is carried out safety appraisal of the dangerous houses, it is put forward reinforcing measure and suggestion on these houses, which is useful to the reform of brick-concrete houses and newly built ones.
2009, 39(1): 50-51.
doi: 10.13204/j.gyjz200901010
Abstract:
It was proposed an ecotype house , which is advantageous for reconstruction after an earthquake disaster .The house features simple construction method, good hot performance , using local material massively and reuse of as well as easy degradation and good economy etc , which can be used in a big scale for reconstructions after seismic disaster .
It was proposed an ecotype house , which is advantageous for reconstruction after an earthquake disaster .The house features simple construction method, good hot performance , using local material massively and reuse of as well as easy degradation and good economy etc , which can be used in a big scale for reconstructions after seismic disaster .
2009, 39(1): 52-55.
doi: 10.13204/j.gyjz200901011
Abstract:
Post-earthquake transitional housings which built in Chenjiaba District, Beichuan County, Sichuan Province aided by Qingdao are light steel structure assembled housings. For which cold-formed thin-wall steel structure system is used and jointless plates with direct welding connection are also used between truss members and are characterised by simple production, light weight, easy installation, convenient disassembly and reuse, short construction period, reliable structure force and strong seismic ability. It is analysed bearing capacity of truss members and the distribution and effect of the secondary stresses. The results show that transitional housing placements structure has adequate security. The adverse effects of secondary stress due to node geometric flaw to steel truss without node plate connections should be considered when internal force is analysed.
Post-earthquake transitional housings which built in Chenjiaba District, Beichuan County, Sichuan Province aided by Qingdao are light steel structure assembled housings. For which cold-formed thin-wall steel structure system is used and jointless plates with direct welding connection are also used between truss members and are characterised by simple production, light weight, easy installation, convenient disassembly and reuse, short construction period, reliable structure force and strong seismic ability. It is analysed bearing capacity of truss members and the distribution and effect of the secondary stresses. The results show that transitional housing placements structure has adequate security. The adverse effects of secondary stress due to node geometric flaw to steel truss without node plate connections should be considered when internal force is analysed.
2009, 39(1): 56-59.
doi: 10.13204/j.gyjz200901012
Abstract:
It is introduced a new type of prefabricated house using laminated bamboo sheets and structural elements. The design and production of the members of the house were discussed and it is described how to assemble the members. Comments on the working performance are conducted based on the raleted experiments and analysis.
It is introduced a new type of prefabricated house using laminated bamboo sheets and structural elements. The design and production of the members of the house were discussed and it is described how to assemble the members. Comments on the working performance are conducted based on the raleted experiments and analysis.
2009, 39(1): 60-64.
doi: 10.13204/j.gyjz200901013
Abstract:
It is a researched mainly the strategy of the adaptive renewal of the internal space according to the change form and different adjustive form of the internal space of the industrial architectural heritage. It is also realized the purpose of the adaptive renewal of the old buildings through transforming the function of the new and old one, the conforming and expansion of the space. Especially it is expounded the importance of low energy reform to the adaptive renewal of the industrial architectural heritage.
It is a researched mainly the strategy of the adaptive renewal of the internal space according to the change form and different adjustive form of the internal space of the industrial architectural heritage. It is also realized the purpose of the adaptive renewal of the old buildings through transforming the function of the new and old one, the conforming and expansion of the space. Especially it is expounded the importance of low energy reform to the adaptive renewal of the industrial architectural heritage.
2009, 39(1): 65-70.
doi: 10.13204/j.gyjz200901014
Abstract:
There are a lot of constructions of reusing old buildings in our country. It is analyzed that lots of founded buildings, and put forward the principles of interior space recreation in old buildings: i.e.the integral principle of matching, conformity and evolution, and the recreation's possible approaches i.e .unification, apposition, contrast, dissipation and conversion, etc.
There are a lot of constructions of reusing old buildings in our country. It is analyzed that lots of founded buildings, and put forward the principles of interior space recreation in old buildings: i.e.the integral principle of matching, conformity and evolution, and the recreation's possible approaches i.e .unification, apposition, contrast, dissipation and conversion, etc.
2009, 39(1): 71-75,70.
doi: 10.13204/j.gyjz200901015
Abstract:
The bearing capacity behavior of foundations under combined loading is one of the key issues in design of offshore structures. Recently, limit load envelope diagram is used to replace traditional calculations of limit bearing capacity to evaluate the combined limit bearing capacity of foundations. In this paper, FEM parameter study of bearing capacity of foundations under VM loading is performed using software ABAQUS. And the foundations are simplified as footings on the surface of undrained two- layered saturated clay with unlimited tension between footing and subsoil. The effects of soil strength profile and combined loading on the subsoil capacity and failure mode are investigated. A limit load diagram under VM load is also presented and can be used to develop and improve the design of offshore foundations.
The bearing capacity behavior of foundations under combined loading is one of the key issues in design of offshore structures. Recently, limit load envelope diagram is used to replace traditional calculations of limit bearing capacity to evaluate the combined limit bearing capacity of foundations. In this paper, FEM parameter study of bearing capacity of foundations under VM loading is performed using software ABAQUS. And the foundations are simplified as footings on the surface of undrained two- layered saturated clay with unlimited tension between footing and subsoil. The effects of soil strength profile and combined loading on the subsoil capacity and failure mode are investigated. A limit load diagram under VM load is also presented and can be used to develop and improve the design of offshore foundations.
2009, 39(1): 76-78.
doi: 10.13204/j.gyjz200901016
Abstract:
Based on model test of pile group, the changes in excess pore water pressure are measured as single pile and pile group are pressed; the dissipation and distribution of excess pore water pressure as well as effect of construction order are analyzed. The excess pore water pressure is continuously accumulated wi th increasing of pile's number, but this tend is getting slower. In horizontal direction, excess pore water pressure nonlinearity decreased wi th increasi ng of the distance between measuri ng point and pile's axis. The effect range of excess pore water pressure i s within 5D (herein D is the diameter of pile). The excess p ore water pressure con tinuously increased along depth and the increment of lateral side is much greater than that in the region of pile group. The dissipation of excess pore water pressure is related to the soil's permeability and dissipation is a slow process. Measures for discharg i ng pore water should be adopted to reduce soil squeezing effect in pile group cons truction
Based on model test of pile group, the changes in excess pore water pressure are measured as single pile and pile group are pressed; the dissipation and distribution of excess pore water pressure as well as effect of construction order are analyzed. The excess pore water pressure is continuously accumulated wi th increasing of pile's number, but this tend is getting slower. In horizontal direction, excess pore water pressure nonlinearity decreased wi th increasi ng of the distance between measuri ng point and pile's axis. The effect range of excess pore water pressure i s within 5D (herein D is the diameter of pile). The excess p ore water pressure con tinuously increased along depth and the increment of lateral side is much greater than that in the region of pile group. The dissipation of excess pore water pressure is related to the soil's permeability and dissipation is a slow process. Measures for discharg i ng pore water should be adopted to reduce soil squeezing effect in pile group cons truction
2009, 39(1): 79-84.
doi: 10.13204/j.gyjz200901017
Abstract:
A simple analytical two-stages method for determining the lateral displacement and internal forces of group piles caused by tunnelling is presented here. The analytical solution proposed by Logananthan and Poulos is used to estimate the free-field soil lateral displacement induced by tunnelling at the first stage. At the second stage, the pile is treated as a beam on elastic foundation based on Winkler model and the lateral displacement governing equation of single pile is formulated by composing the free-field soil lateral movement to the pile. Then it is computed the shielding effect due to pile-pile interaction of passive group piles using simpli fied Mindlin equation. Finally the response of passive group piles due to tunnelling is obtained. The result from present approach is compared with that from FEM and BEM, good agreement is obtained.
A simple analytical two-stages method for determining the lateral displacement and internal forces of group piles caused by tunnelling is presented here. The analytical solution proposed by Logananthan and Poulos is used to estimate the free-field soil lateral displacement induced by tunnelling at the first stage. At the second stage, the pile is treated as a beam on elastic foundation based on Winkler model and the lateral displacement governing equation of single pile is formulated by composing the free-field soil lateral movement to the pile. Then it is computed the shielding effect due to pile-pile interaction of passive group piles using simpli fied Mindlin equation. Finally the response of passive group piles due to tunnelling is obtained. The result from present approach is compared with that from FEM and BEM, good agreement is obtained.
2009, 39(1): 85-89.
doi: 10.13204/j.gyjz200901018
Abstract:
Unified strength theory is introduced to consider the influence of intermediate principal stress, the calculation formula of allowable soil resistance on anchorage section of anti-slide piles is deduced. Mean while, the semi-analytical and semi-numerical weighted residual method is used to calculate the required soil resistance on anchorage section of anti-slide piles, and a new rational method to determine anti-slide anchorage length is put forwarded. The proposed method is applied to two calculation examples, the distribution of req uired soil resistance on piles and distribu tion of allowable soil resistance with different unified strength parameter s are obtained, the rational anchorage length is determined by comparative analysis of the distribution diagrams. The analysis result also shows that the allowable soil resistance on piles which is gained by unified strength theory increases with unified strength parameterb.
Unified strength theory is introduced to consider the influence of intermediate principal stress, the calculation formula of allowable soil resistance on anchorage section of anti-slide piles is deduced. Mean while, the semi-analytical and semi-numerical weighted residual method is used to calculate the required soil resistance on anchorage section of anti-slide piles, and a new rational method to determine anti-slide anchorage length is put forwarded. The proposed method is applied to two calculation examples, the distribution of req uired soil resistance on piles and distribu tion of allowable soil resistance with different unified strength parameter s are obtained, the rational anchorage length is determined by comparative analysis of the distribution diagrams. The analysis result also shows that the allowable soil resistance on piles which is gained by unified strength theory increases with unified strength parameterb.
2009, 39(1): 90-92.
doi: 10.13204/j.gyjz200901019
Abstract:
The calculation formula on the minimum ratio of the reinforcement in reinforced concrete flexural members is deduced in this paper. And some suggestions about the minimum ratio of the reinforcement in reinforced concrete flexural members with HRB500 steel bar are proposed based on the national regulation of the minimum ratio of the reinforcement at home and abroad. The reference is provided for placing HRB500 steel bar in the Code for design of concrete structures.
The calculation formula on the minimum ratio of the reinforcement in reinforced concrete flexural members is deduced in this paper. And some suggestions about the minimum ratio of the reinforcement in reinforced concrete flexural members with HRB500 steel bar are proposed based on the national regulation of the minimum ratio of the reinforcement at home and abroad. The reference is provided for placing HRB500 steel bar in the Code for design of concrete structures.
2009, 39(1): 93-96.
doi: 10.13204/j.gyjz200901020
Abstract:
It was carried out the test of the basic mechanical proper ties of steel fiber reinforced haydite concrete before and after curbonization. The results showed that the compressive strength, bending strength and splitting tensile strength of the concrete were all increased wi th the growth of carbonization age, which provided a test basis for the durabili ty design and analysis of steel fiber-reirforded light aggregate conrete.
It was carried out the test of the basic mechanical proper ties of steel fiber reinforced haydite concrete before and after curbonization. The results showed that the compressive strength, bending strength and splitting tensile strength of the concrete were all increased wi th the growth of carbonization age, which provided a test basis for the durabili ty design and analysis of steel fiber-reirforded light aggregate conrete.
2009, 39(1): 97-100.
doi: 10.13204/j.gyjz200901021
Abstract:
Cracking of concrete caused by early age volume changes such as shrinkage and thermal deformati on is always a problem for cast-in-place concrete structures. Such premature cracki ng affects the serviceability, durability, and even safety of the concrete structure. Integrated analysis is preformed for deformation-caused cracking from the aspects of materials, structures and constructions. Based on the bond-slip theory, cracki ng mechanism and parameters are analyzed and calculated for the axial restrained reinforced concrete members, and finally the differences in mechanical properties between load-caused and deformation-caused crackings are compared.
Cracking of concrete caused by early age volume changes such as shrinkage and thermal deformati on is always a problem for cast-in-place concrete structures. Such premature cracki ng affects the serviceability, durability, and even safety of the concrete structure. Integrated analysis is preformed for deformation-caused cracking from the aspects of materials, structures and constructions. Based on the bond-slip theory, cracki ng mechanism and parameters are analyzed and calculated for the axial restrained reinforced concrete members, and finally the differences in mechanical properties between load-caused and deformation-caused crackings are compared.
2009, 39(1): 101-104,121.
doi: 10.13204/j.gyjz200901022
Abstract:
Based on the electro -migration method for corrosion simulation, pull-out tests were conducted to study the bond properties of non -uniformly corroded deformed bar in concrete. The following conclusions can be drawn from this study; 1) The concrete cover-cracking is influenced not only by corrosion rate but also by area ratio of corroded bar in concrete. Under the same conditions, the larger the area ratio of corroded bar is, the smaller the corrosion rate of bar will be at the cover cracking time. 2) For member s wi thout stirrups, the bond strength will decrease at cover cracking. Then the larger the crack width is the less the bond strength will be. But for hooped members, the ultimate bond strength will not be weakened even the crack width is up to 0.2mm. 3) It is not remarkable that non-uniform corrosion influence on bond slip between concrete and deformed bar when the corrosion rate is within 2.4%
Based on the electro -migration method for corrosion simulation, pull-out tests were conducted to study the bond properties of non -uniformly corroded deformed bar in concrete. The following conclusions can be drawn from this study; 1) The concrete cover-cracking is influenced not only by corrosion rate but also by area ratio of corroded bar in concrete. Under the same conditions, the larger the area ratio of corroded bar is, the smaller the corrosion rate of bar will be at the cover cracking time. 2) For member s wi thout stirrups, the bond strength will decrease at cover cracking. Then the larger the crack width is the less the bond strength will be. But for hooped members, the ultimate bond strength will not be weakened even the crack width is up to 0.2mm. 3) It is not remarkable that non-uniform corrosion influence on bond slip between concrete and deformed bar when the corrosion rate is within 2.4%
2009, 39(1): 105-109.
doi: 10.13204/j.gyjz200901023
Abstract:
Suspendome is largely sustained by temporary suppor ts before construction begins. And these supports are not removed in construction. Considering the influence caused by temporary supports will be of benefit to security of structure and optimal distributing of supports. Based on the project of badminton gymnasium for 2008 Olympic Games, it is carried out the emulation analysis of construction process of the structure in different situations by the way of the finite element software. The analysis considering temporary supports indicates that the real response of structure can be shown more veraciously. Because of the temporary supports. effects, the components . internal forces and displacements of non-supports structure are different from the ones of structure considering supports. Besides, the amplitude of force for some particular component varies a lot, and it's indispensable to check the intensi ty and stiffness of structure in construction.
Suspendome is largely sustained by temporary suppor ts before construction begins. And these supports are not removed in construction. Considering the influence caused by temporary supports will be of benefit to security of structure and optimal distributing of supports. Based on the project of badminton gymnasium for 2008 Olympic Games, it is carried out the emulation analysis of construction process of the structure in different situations by the way of the finite element software. The analysis considering temporary supports indicates that the real response of structure can be shown more veraciously. Because of the temporary supports. effects, the components . internal forces and displacements of non-supports structure are different from the ones of structure considering supports. Besides, the amplitude of force for some particular component varies a lot, and it's indispensable to check the intensi ty and stiffness of structure in construction.
2009, 39(1): 110-113,141.
doi: 10.13204/j.gyjz200901024
Abstract:
According to the code for design of concrete structure and the iconographical rules, it was explored that the structure and use of reinforced concrete frame beam-column join t under the iconographical rules in order to let per sonnel of design, cons truction and project cost understand well the mutual positions of rehars for the frame joints, thus increasing experience in actual projects.
According to the code for design of concrete structure and the iconographical rules, it was explored that the structure and use of reinforced concrete frame beam-column join t under the iconographical rules in order to let per sonnel of design, cons truction and project cost understand well the mutual positions of rehars for the frame joints, thus increasing experience in actual projects.
2009, 39(1): 114-116,127.
doi: 10.13204/j.gyjz200901025
Abstract:
Plane cyclic casting , temperature-control curing by computer s and heat insulation by film cover etc are used to construct 2.5 m thick antiradiative concrete for a basement. The quality requirements are obtained without using cooling mehtod, anticrack fiber and bar ite concrete.
Plane cyclic casting , temperature-control curing by computer s and heat insulation by film cover etc are used to construct 2.5 m thick antiradiative concrete for a basement. The quality requirements are obtained without using cooling mehtod, anticrack fiber and bar ite concrete.
2009, 39(1): 117-121.
doi: 10.13204/j.gyjz200901026
Abstract:
Two specimens at full scale of bidirectional pin??hinged joint in the Guangzhou new TV tower were tested using FEM analysis. The joint was the connection between a floor beam with an outer tube column, which was composed of radial spherical plain bearing, embeded slab, ear plate and pin. Based on the goal of the test, the test was carried out in two stages. After completion of test stage 1, some improving ideas were advanced for structural details of joints, and then the improved joints were tested in test stage 2. The experimental method, behavior within the whole loading period and failure mode of the joint were described. The test results indicated that the ultimate capacity of the joints was over 2.5 times of the designed load.The loading force on the failure condition has exceeded the rated dead load of bearing in two test stages. No failure behavior of the bearing was observed in the test. Both the test results and the FEM analysis results proved that the reinforcement of the joint with ear plate A and thickening flange of the connecting region of flange were quite effective.
Two specimens at full scale of bidirectional pin??hinged joint in the Guangzhou new TV tower were tested using FEM analysis. The joint was the connection between a floor beam with an outer tube column, which was composed of radial spherical plain bearing, embeded slab, ear plate and pin. Based on the goal of the test, the test was carried out in two stages. After completion of test stage 1, some improving ideas were advanced for structural details of joints, and then the improved joints were tested in test stage 2. The experimental method, behavior within the whole loading period and failure mode of the joint were described. The test results indicated that the ultimate capacity of the joints was over 2.5 times of the designed load.The loading force on the failure condition has exceeded the rated dead load of bearing in two test stages. No failure behavior of the bearing was observed in the test. Both the test results and the FEM analysis results proved that the reinforcement of the joint with ear plate A and thickening flange of the connecting region of flange were quite effective.
2009, 39(1): 122-127.
doi: 10.13204/j.gyjz200901027
Abstract:
Overlapped tubular K-joints are widely used in long-span space structures. However, there are still doubts and blind zones in forced features, ultimate bearing capacity and influencing factors of these sorts of joints. Nonlinear FEM is used to study the forced performance of the joints under different lap rates, and also analyzed that the effects of branch-main diameter ratio, diameter-thickness ratio of the main, branch-main wall thickness ratio and hidden weld conditions etc on the ultimate capacity of these joints. Finally, a set of formulae to calculate the bearing capacity of the overlapped tubular Kjoints are obtained by nonlinear regressive technique.
Overlapped tubular K-joints are widely used in long-span space structures. However, there are still doubts and blind zones in forced features, ultimate bearing capacity and influencing factors of these sorts of joints. Nonlinear FEM is used to study the forced performance of the joints under different lap rates, and also analyzed that the effects of branch-main diameter ratio, diameter-thickness ratio of the main, branch-main wall thickness ratio and hidden weld conditions etc on the ultimate capacity of these joints. Finally, a set of formulae to calculate the bearing capacity of the overlapped tubular Kjoints are obtained by nonlinear regressive technique.
2009, 39(1): 128-130,137.
doi: 10.13204/j.gyjz200901028
Abstract:
It is compured the fatigue failure mode of concrete- filled steel tube(CFST) joint to that of hollow tube joint using model test, it is known that there is a basic agreement between the two. It is also proposed a way of predicting the fatigue life of CFST arch bridge tubular joints based on the method of natural flaw. And the rationality of the method in a certain range is verified by a real example.
It is compured the fatigue failure mode of concrete- filled steel tube(CFST) joint to that of hollow tube joint using model test, it is known that there is a basic agreement between the two. It is also proposed a way of predicting the fatigue life of CFST arch bridge tubular joints based on the method of natural flaw. And the rationality of the method in a certain range is verified by a real example.
2009, 39(1): 131-133.
doi: 10.13204/j.gyjz200901029
Abstract:
Constructed in the 1980s, the low- stundard residences can not meet the requirements of modern society, which need reconstruction. According to the structural featues and combined with schemes of building reconstruction, it has been proposed the scheme of removing partial wall slabs and adding shear walls, by which the ant-i lateral force system of an original structure was changed, thus increasing its service life.
Constructed in the 1980s, the low- stundard residences can not meet the requirements of modern society, which need reconstruction. According to the structural featues and combined with schemes of building reconstruction, it has been proposed the scheme of removing partial wall slabs and adding shear walls, by which the ant-i lateral force system of an original structure was changed, thus increasing its service life.
2009, 39(1): 134-137.
doi: 10.13204/j.gyjz200901030
Abstract:
Five simply supported beams strengthened by basalt fiber reinforced polymer(BFRP) are tested. The experimental factors are width and spacing of BFRP strips, layers of BFRP. The experimental results indicate that BFRP can evidently increase the shear strength and improve the ductility of these specimens. A design formula is proposed.
Five simply supported beams strengthened by basalt fiber reinforced polymer(BFRP) are tested. The experimental factors are width and spacing of BFRP strips, layers of BFRP. The experimental results indicate that BFRP can evidently increase the shear strength and improve the ductility of these specimens. A design formula is proposed.
2009, 39(1): 138-141.
doi: 10.13204/j.gyjz200901031
Abstract:
This paper tells how to work out principles of protection and restoration, according to levels of protection of building thus progressively realizing the design process from the planning of the overall layout of building to monomer in restoration and remodeling of Qingdao Changzhou Road prison, so that this building can be innovatively interpreted in modern social environment.
This paper tells how to work out principles of protection and restoration, according to levels of protection of building thus progressively realizing the design process from the planning of the overall layout of building to monomer in restoration and remodeling of Qingdao Changzhou Road prison, so that this building can be innovatively interpreted in modern social environment.
