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2007 Vol. 37, No. 2
Display Method:
2007, 37(2): 1-5.
doi: 10.13204/j.gyjz200702001
Abstract:
According to the characteristic of reinforced concrete frame-shear wall structure,the seismic performance level is divided into three levels: serviceability, life-safety, and collapse prevention. The three levels are qualified with storey drift ratios. Applying the inverted triangular distribution of lateral force to the cantilever column of constant section, and the displaced shape of the column is regarded as the initial mode of lateral displacement. For serviceability, the displaced shape, which storey drift ratio of the floor level at point of contraflexure on the initial mode of lateral displacement is equal to limit of the storey drift ratio, may be seen as target displacement mode. Based on the target displacement mode of frame-shear wall structure in the serviceability performance level, the equivalent parameter can be obtained. Thus, the base shear V_b and horizontal earthquake force F_i at each floor of the building can be determined. Finally, the designed structure is analyzed with nonlinear static analysis method and the design is adjusted by the pushover analysis result until it is satisfied.
According to the characteristic of reinforced concrete frame-shear wall structure,the seismic performance level is divided into three levels: serviceability, life-safety, and collapse prevention. The three levels are qualified with storey drift ratios. Applying the inverted triangular distribution of lateral force to the cantilever column of constant section, and the displaced shape of the column is regarded as the initial mode of lateral displacement. For serviceability, the displaced shape, which storey drift ratio of the floor level at point of contraflexure on the initial mode of lateral displacement is equal to limit of the storey drift ratio, may be seen as target displacement mode. Based on the target displacement mode of frame-shear wall structure in the serviceability performance level, the equivalent parameter can be obtained. Thus, the base shear V_b and horizontal earthquake force F_i at each floor of the building can be determined. Finally, the designed structure is analyzed with nonlinear static analysis method and the design is adjusted by the pushover analysis result until it is satisfied.
2007, 37(2): 6-10,13.
doi: 10.13204/j.gyjz200702002
Abstract:
It is made an experiment on six T-shaped cross section column frame joints (2/3 reduced scale) under low-cycle repeated loads. According to different experiment aim, three groups are made. It is used that variable parameters of beam section height, the axis-pressed ratio and the hoop steel ratio to research their effects on cracks form and development, failure mechanism of the joints and the a seismic performance (including to anchorage of beam bars, joints ductility and energy consumption). It is pointed out that joints' crack shape appears reverse K but not the common rectangle joints' X shape, the forced mechanism is liable to the inclined press-pole mechanism. At the same time, it is also pointed out that the effect of the flange width of the joints on the aseismic performance of the joints relates to the bending stiffness ratio of beam and column.
It is made an experiment on six T-shaped cross section column frame joints (2/3 reduced scale) under low-cycle repeated loads. According to different experiment aim, three groups are made. It is used that variable parameters of beam section height, the axis-pressed ratio and the hoop steel ratio to research their effects on cracks form and development, failure mechanism of the joints and the a seismic performance (including to anchorage of beam bars, joints ductility and energy consumption). It is pointed out that joints' crack shape appears reverse K but not the common rectangle joints' X shape, the forced mechanism is liable to the inclined press-pole mechanism. At the same time, it is also pointed out that the effect of the flange width of the joints on the aseismic performance of the joints relates to the bending stiffness ratio of beam and column.
2007, 37(2): 11-13,10.
doi: 10.13204/j.gyjz200702003
Abstract:
One 4-story R.C. frame structure model with broad-limb T-shaped column is tested under low cyclic and repeated static load. The seismic behavior, ductility, characteristic of resilience, skeleton curve, and degeneration of rigidity are studied in the experiment. It is shown by the test results that the seismic behavior of R.C .T- shaped column structure is satisfactory.
One 4-story R.C. frame structure model with broad-limb T-shaped column is tested under low cyclic and repeated static load. The seismic behavior, ductility, characteristic of resilience, skeleton curve, and degeneration of rigidity are studied in the experiment. It is shown by the test results that the seismic behavior of R.C .T- shaped column structure is satisfactory.
2007, 37(2): 14-16.
doi: 10.13204/j.gyjz200702004
Abstract:
Interactive mechanism of masonry-infilled walls and frame structures is analysed, mainly involving load paths, infilled wall placement, additive action, captive columns and mechanical models. Some suggestions on seismic design or retrofit are also given.
Interactive mechanism of masonry-infilled walls and frame structures is analysed, mainly involving load paths, infilled wall placement, additive action, captive columns and mechanical models. Some suggestions on seismic design or retrofit are also given.
2007, 37(2): 17-21,27.
doi: 10.13204/j.gyjz200702005
Abstract:
Reliability of system is an important index that evaluates holistic performance of structures. During the calculation of reliability of system, failure dependency of the components or the sections is one of the key problems that need solutions. Based on the method of static elastoplasticity, the failure dependency problem of RC frame structures studied under small and strong earthquakes. The conclusion validated that failure of beam constraints statistically independent under small earthquakes. On the basis of research achievements under small earthquakes, some failure dependency rules of beam and column are obtained under strong earthquakes.
Reliability of system is an important index that evaluates holistic performance of structures. During the calculation of reliability of system, failure dependency of the components or the sections is one of the key problems that need solutions. Based on the method of static elastoplasticity, the failure dependency problem of RC frame structures studied under small and strong earthquakes. The conclusion validated that failure of beam constraints statistically independent under small earthquakes. On the basis of research achievements under small earthquakes, some failure dependency rules of beam and column are obtained under strong earthquakes.
2007, 37(2): 22-27,21.
doi: 10.13204/j.gyjz200702006
Abstract:
It is firstly introduced the steps and parameters setting of the pushover analysis in SAP2000. Then, the soft-ware is used to finish the pushover analysis of an 8-story frame structure with large-span unbonded prestressed floor and a similar RC frame in an 8-degree seismic fortification intensity zone. With the purpose of evaluating the antiseismic performance of the prestressed structure, it is compared between the above two kinds of structures, including the base shear force-top displacement curves, the performance points, and the occurring sequence of the plastic hinges. The theoretical analysis and the calculating results indicate that when the buildings are regular and not too high, to compare with the similar RC structure, the prestressed frame structure has a better stiffness after cracks, a larger ultimate loading capacity, and a beam-hinge failure mechanism with better antiseismic performance.
It is firstly introduced the steps and parameters setting of the pushover analysis in SAP2000. Then, the soft-ware is used to finish the pushover analysis of an 8-story frame structure with large-span unbonded prestressed floor and a similar RC frame in an 8-degree seismic fortification intensity zone. With the purpose of evaluating the antiseismic performance of the prestressed structure, it is compared between the above two kinds of structures, including the base shear force-top displacement curves, the performance points, and the occurring sequence of the plastic hinges. The theoretical analysis and the calculating results indicate that when the buildings are regular and not too high, to compare with the similar RC structure, the prestressed frame structure has a better stiffness after cracks, a larger ultimate loading capacity, and a beam-hinge failure mechanism with better antiseismic performance.
2007, 37(2): 28-31,36.
doi: 10.13204/j.gyjz200702007
Abstract:
As the first and chief component to anti-earthquake in the shear wall structure designing, the coupling wall-beam, which is designed well or not, affects the anti-earthquake performance of a building. It is discussed some problems in the design, and is also done quantitative analysis to present corresponding viewpoints and proposals.
As the first and chief component to anti-earthquake in the shear wall structure designing, the coupling wall-beam, which is designed well or not, affects the anti-earthquake performance of a building. It is discussed some problems in the design, and is also done quantitative analysis to present corresponding viewpoints and proposals.
2007, 37(2): 32-36,31.
doi: 10.13204/j.gyjz200702008
Abstract:
It is analyzed the optimal design method of tuned liquid dampers(TLDs) for controlling the multi-mode seismic responses of structures. For the sake of avoiding the problem of complex numerical optimal procedure, a simplified method applicable to engineering is presented. TLDs' control efficiencies obtained by the simplified method are compared with those gained by an un-simplified method using a numerical example. Meanwhile, the rationality and applicability of the simplified method are verified.
It is analyzed the optimal design method of tuned liquid dampers(TLDs) for controlling the multi-mode seismic responses of structures. For the sake of avoiding the problem of complex numerical optimal procedure, a simplified method applicable to engineering is presented. TLDs' control efficiencies obtained by the simplified method are compared with those gained by an un-simplified method using a numerical example. Meanwhile, the rationality and applicability of the simplified method are verified.
2007, 37(2): 37-40,69.
doi: 10.13204/j.gyjz200702009
Abstract:
The experiments of a multi-ribbed wall building model and a hollow brick masonry building model with the same architectural layout are introduced. According to the experimental results, the seismic performances of the two kinds of structures are analyzed through contrast. The study shows that multi-ribbed wall structure is better than masonry structure in the capacity of bearing, deformation, and energy dissipation, so multi-ribbed wall structure is a new type of seismic structure.
The experiments of a multi-ribbed wall building model and a hollow brick masonry building model with the same architectural layout are introduced. According to the experimental results, the seismic performances of the two kinds of structures are analyzed through contrast. The study shows that multi-ribbed wall structure is better than masonry structure in the capacity of bearing, deformation, and energy dissipation, so multi-ribbed wall structure is a new type of seismic structure.
2007, 37(2): 41-43,54.
doi: 10.13204/j.gyjz200702010
Abstract:
Energy consumption is influenced directly by the skylight of a atrium. Some models of the skylight of a atrium are assumed, the relation between energy consumption and roof-light skylight which type, obliquity and orientation is different is analyzed and discussed; and initial result is also achieved, energy_saving design of buildings in the future.
Energy consumption is influenced directly by the skylight of a atrium. Some models of the skylight of a atrium are assumed, the relation between energy consumption and roof-light skylight which type, obliquity and orientation is different is analyzed and discussed; and initial result is also achieved, energy_saving design of buildings in the future.
2007, 37(2): 44-46,49.
doi: 10.13204/j.gyjz200702011
Abstract:
Sun_shading is an effective path of a building's energy_saving.The regions of being hot in summer and warm in winter have self_characteristics.The application of sun_shading facilities and their developing trend in the regions of being hot in summer and warm in winter are analyzed through introducing the basic forms and characteristics of building sun_shading,as well as according to the art and techniques.
Sun_shading is an effective path of a building's energy_saving.The regions of being hot in summer and warm in winter have self_characteristics.The application of sun_shading facilities and their developing trend in the regions of being hot in summer and warm in winter are analyzed through introducing the basic forms and characteristics of building sun_shading,as well as according to the art and techniques.
2007, 37(2): 47-49,46.
doi: 10.13204/j.gyjz200702012
Abstract:
Based on the bilinear hysteretic model, the elastoplastic time_history analysis of the parallel base isolated system is carried out. In which the approximate treatment method at the inflexion point is introduced and the calculating formula of each dissipating energy for the base isolated structure is given. In the engineering example, the time-history curve of each energy component and the isolating effect of parallel base isolated system are also shown.
Based on the bilinear hysteretic model, the elastoplastic time_history analysis of the parallel base isolated system is carried out. In which the approximate treatment method at the inflexion point is introduced and the calculating formula of each dissipating energy for the base isolated structure is given. In the engineering example, the time-history curve of each energy component and the isolating effect of parallel base isolated system are also shown.
2007, 37(2): 50-54.
doi: 10.13204/j.gyjz200702013
Abstract:
In order to study the reflected signal in coaxial cable of time domain reflectometry deformation monitoring fully,accurately and efficiently,it is proposed to use Haar wavelet transform for analyzing these reflected signals and to distinguish instability region in soil and rock according to detail signal of large scale.Two engineering cases show that the shear deformation region giving rise to instability of soil and rock can be visualized highlightly by this method and the area deforming in certain time interval can be observed directly through contrasting the results of wavelet analysis received in correspondence time interval.So,this method has positive significance to realize early warning of excessive deformation of soil and rock effectively.
In order to study the reflected signal in coaxial cable of time domain reflectometry deformation monitoring fully,accurately and efficiently,it is proposed to use Haar wavelet transform for analyzing these reflected signals and to distinguish instability region in soil and rock according to detail signal of large scale.Two engineering cases show that the shear deformation region giving rise to instability of soil and rock can be visualized highlightly by this method and the area deforming in certain time interval can be observed directly through contrasting the results of wavelet analysis received in correspondence time interval.So,this method has positive significance to realize early warning of excessive deformation of soil and rock effectively.
2007, 37(2): 55-59,73.
doi: 10.13204/j.gyjz200702014
Abstract:
Such disadvantages as sensitivity to inertia coefficient, time consuming etc. are always encountered in the application of particle swarm optimization algorithm. The procedure used in harmony search algorithm and the assumption of discontinuous flying are imported into the particle swarm optimization algorithm. Firstly, when the boundaries are exceeded, the harmony search algorithm is implemented to obtain a new trial solution; and secondly, random number of particles instead of static number are allowed to update their velocities and positions in order to decrease the time consumed by the algorithm. The particle swarm optimization algorithm and the mixed version of particle swarm optimization algorithm are applied to the determination of critical slip surface of given complicated soil slopes. The comparative study shows that the mixed version of particle swarm optimization algorithm tends to find better solution spending little time than particle swarm optimization algorithm.
Such disadvantages as sensitivity to inertia coefficient, time consuming etc. are always encountered in the application of particle swarm optimization algorithm. The procedure used in harmony search algorithm and the assumption of discontinuous flying are imported into the particle swarm optimization algorithm. Firstly, when the boundaries are exceeded, the harmony search algorithm is implemented to obtain a new trial solution; and secondly, random number of particles instead of static number are allowed to update their velocities and positions in order to decrease the time consumed by the algorithm. The particle swarm optimization algorithm and the mixed version of particle swarm optimization algorithm are applied to the determination of critical slip surface of given complicated soil slopes. The comparative study shows that the mixed version of particle swarm optimization algorithm tends to find better solution spending little time than particle swarm optimization algorithm.
2007, 37(2): 60-64.
doi: 10.13204/j.gyjz200702015
Abstract:
The prediction model of vertical ultimate bearing capacity of single pile is built by combining improved genetic algorithm and support vector regression machine.The practical data are used to train the support vector machine whose parameters are determined in global optimization by improved genetic algorithm.Thus,a prediction model with better generalizing capacity is built.The study shows that this method is effective for determining the parameters of support vector machine,and the results are satisfactory.
The prediction model of vertical ultimate bearing capacity of single pile is built by combining improved genetic algorithm and support vector regression machine.The practical data are used to train the support vector machine whose parameters are determined in global optimization by improved genetic algorithm.Thus,a prediction model with better generalizing capacity is built.The study shows that this method is effective for determining the parameters of support vector machine,and the results are satisfactory.
2007, 37(2): 65-69,40.
doi: 10.13204/j.gyjz200702016
Abstract:
The expanded polystyrene sheet (EPS) is an energy-saving material for buildings, which has wide use and good practicability. EPS features excellent thermal property, energy-saving and environmental protection etc when it is used for external wall insulation. According to the insulation peeling, cracks of finished coats and poor appearance etc occur frequently in actual projects, it is pointed out that during the construction of EPS external wall insulation, the quality of the project can be insured and the expected technical and economic benefits can be obtained only by paying attention to the quality of the selected materials and the compatibility among the main materials besides enhancing the improvement on construction technology.
The expanded polystyrene sheet (EPS) is an energy-saving material for buildings, which has wide use and good practicability. EPS features excellent thermal property, energy-saving and environmental protection etc when it is used for external wall insulation. According to the insulation peeling, cracks of finished coats and poor appearance etc occur frequently in actual projects, it is pointed out that during the construction of EPS external wall insulation, the quality of the project can be insured and the expected technical and economic benefits can be obtained only by paying attention to the quality of the selected materials and the compatibility among the main materials besides enhancing the improvement on construction technology.
2007, 37(2): 70-73,59.
doi: 10.13204/j.gyjz200702017
Abstract:
Through a study on 2-D and 3-D carbonations of high_performance concrete with different flyash proportion(0%,15%,20%,40%,60%), the test methods of 2-D and 3-D carbonations are built; the mathematical models of 2-D and 3-D carbonations are also proposed. The superposition coefficient of 2-D and 3-D carbonations are defined; the mathematic formula of the superposition coefficient is given. The experiment indicates that the carbonations of 2-D and 3-D are similar to that of 1-D, which obey the exponential function of time t. At the same time,they have superposition coefficient obviously. During the early stage carbonation, the superposition coefficient of 2-D can be over 4.0, and it can be 6.0 of 3-D. During the carbonation of 28 days (which corresponds to natural carbonation of 50 years), the superpostion coefficient of 2-D can be over 2.0, and it can be 4.0 of 3-D. The superposition coefficient obeys the attenuation function through time t.
Through a study on 2-D and 3-D carbonations of high_performance concrete with different flyash proportion(0%,15%,20%,40%,60%), the test methods of 2-D and 3-D carbonations are built; the mathematical models of 2-D and 3-D carbonations are also proposed. The superposition coefficient of 2-D and 3-D carbonations are defined; the mathematic formula of the superposition coefficient is given. The experiment indicates that the carbonations of 2-D and 3-D are similar to that of 1-D, which obey the exponential function of time t. At the same time,they have superposition coefficient obviously. During the early stage carbonation, the superposition coefficient of 2-D can be over 4.0, and it can be 6.0 of 3-D. During the carbonation of 28 days (which corresponds to natural carbonation of 50 years), the superpostion coefficient of 2-D can be over 2.0, and it can be 4.0 of 3-D. The superposition coefficient obeys the attenuation function through time t.
2007, 37(2): 74-76,95.
doi: 10.13204/j.gyjz200702018
Abstract:
By studying the relationship between early autogenous shrinkage and ultimate tensile strain of concrete, the influence laws of water-cement ratio and sand percentage on early autogenous shrinkage are analyzed. Research results show that the relationship between autogenous shrinkage at early ages and ultimate tensile strain can be approximately figured by a quadric equation. It is also demonstrated that autogenous shrinkage of concrete at very early ages increases evidently with the decrease of water-cement ratio and the increase of sand percentage.
By studying the relationship between early autogenous shrinkage and ultimate tensile strain of concrete, the influence laws of water-cement ratio and sand percentage on early autogenous shrinkage are analyzed. Research results show that the relationship between autogenous shrinkage at early ages and ultimate tensile strain can be approximately figured by a quadric equation. It is also demonstrated that autogenous shrinkage of concrete at very early ages increases evidently with the decrease of water-cement ratio and the increase of sand percentage.
2007, 37(2): 77-80.
doi: 10.13204/j.gyjz200702019
Abstract:
Some factors influencing frost resistance of GRC plate and the corresponding levels are studied, and some key factors and influencing laws are found by orthogonal experiment. The influence sequence of these key factors and their relationships with frost resistance are presented by quantitative analysis for freeze_thaw test results. According to experimental and theoretical results, several matched groups that can bring good frost resistance are obtained.
Some factors influencing frost resistance of GRC plate and the corresponding levels are studied, and some key factors and influencing laws are found by orthogonal experiment. The influence sequence of these key factors and their relationships with frost resistance are presented by quantitative analysis for freeze_thaw test results. According to experimental and theoretical results, several matched groups that can bring good frost resistance are obtained.
2007, 37(2): 84-88,99.
doi: 10.13204/j.gyjz200702021
Abstract:
The End plates of concrete_filled steel tubes (CFST) may influence its local compression behaviors. Therefore local compression behaviors of axially loaded CFST members with circular and square sections with end plates of different rigidity are studied experimentally. Section form and local compression area ratio are also examined. From the results, the local compression behaviors approach to the full section compression case as the rigidity increases. The difference of the section form and local compression area ratio can make the influence of the end plates different. Local compression bearing capacity calculation gets good result with finite element method (FEM),which gives an effective approach to further mechnisam analysis.
The End plates of concrete_filled steel tubes (CFST) may influence its local compression behaviors. Therefore local compression behaviors of axially loaded CFST members with circular and square sections with end plates of different rigidity are studied experimentally. Section form and local compression area ratio are also examined. From the results, the local compression behaviors approach to the full section compression case as the rigidity increases. The difference of the section form and local compression area ratio can make the influence of the end plates different. Local compression bearing capacity calculation gets good result with finite element method (FEM),which gives an effective approach to further mechnisam analysis.
2007, 37(2): 89-92.
doi: 10.13204/j.gyjz200702022
Abstract:
Based on demanding of a industry policy and economical energy source in our country, multi-story masonry have been limited in cities. Therefore, a new kind of structure-light gauge steel reinforced concrete shear wall is suggested herein instead of brick masonry. Five light gauge steel reinforced concrete shear walls subjected to cyclic loading are experimented. And the seismic behaviors, such as bearing capacity, failure pattern, hysteretic property, energy dissipation, ductility and declining stiffness of light gauge steel reinforced concrete shear wall, are analyzed by the experiments. Research results indicate that this structure has good forced behavior, which can meet the aseismic requirements.
Based on demanding of a industry policy and economical energy source in our country, multi-story masonry have been limited in cities. Therefore, a new kind of structure-light gauge steel reinforced concrete shear wall is suggested herein instead of brick masonry. Five light gauge steel reinforced concrete shear walls subjected to cyclic loading are experimented. And the seismic behaviors, such as bearing capacity, failure pattern, hysteretic property, energy dissipation, ductility and declining stiffness of light gauge steel reinforced concrete shear wall, are analyzed by the experiments. Research results indicate that this structure has good forced behavior, which can meet the aseismic requirements.
2007, 37(2): 93-95,76.
doi: 10.13204/j.gyjz200702023
Abstract:
In order to study the seismic behaviors and the design method of trussed steel reinforced concrete column , 5 open-web trussed steel reinforced concrete columns and 2 reinforced concrete columns be tested to failure under cyclic-loading. Results of experiment and analysis show that open-web trussed steel reinforced concrete columns have relatively good behavior of ductility and energy dissipation. By comparing to the reinforced concrete columns and using the relevant rules given in the Chinese current design codes, the suggestions on designing the open-web trussed steel reinforced concrete column are given.
In order to study the seismic behaviors and the design method of trussed steel reinforced concrete column , 5 open-web trussed steel reinforced concrete columns and 2 reinforced concrete columns be tested to failure under cyclic-loading. Results of experiment and analysis show that open-web trussed steel reinforced concrete columns have relatively good behavior of ductility and energy dissipation. By comparing to the reinforced concrete columns and using the relevant rules given in the Chinese current design codes, the suggestions on designing the open-web trussed steel reinforced concrete column are given.
2007, 37(2): 96-99,88.
doi: 10.13204/j.gyjz200702024
Abstract:
The research results of concrete filled high strength steel tubular members are summarized, then numerical method is applied in the analyses of load-deformation relations curves of concrete filled high strength steel tubes beam-columns, and calculated results agree well with tested results. Finally, a comparison is made to understand applicability of different codes including DL/T 5085-1999, GJB 4142-2000(2001), AIJ(1997), EC4(1994), AISC-LRFD(1999), and DBJ 13-51-2003(2003) for calculating bearing capacity of concrete filled high strength steel tubes beam-columns.
The research results of concrete filled high strength steel tubular members are summarized, then numerical method is applied in the analyses of load-deformation relations curves of concrete filled high strength steel tubes beam-columns, and calculated results agree well with tested results. Finally, a comparison is made to understand applicability of different codes including DL/T 5085-1999, GJB 4142-2000(2001), AIJ(1997), EC4(1994), AISC-LRFD(1999), and DBJ 13-51-2003(2003) for calculating bearing capacity of concrete filled high strength steel tubes beam-columns.
2007, 37(2): 100-102,106.
doi: 10.13204/j.gyjz200702025
Abstract:
The monolithic rotational and translational technique of a building is proposed based on mechanical analysis, physical modeling and FEA. Furthermore the technique is put into use for the construction of bowling hall of Dongying Gueshhouse. In light of the practice, it is concluded that this new method is feasible and economical and can be referenced by similar engineerings.
The monolithic rotational and translational technique of a building is proposed based on mechanical analysis, physical modeling and FEA. Furthermore the technique is put into use for the construction of bowling hall of Dongying Gueshhouse. In light of the practice, it is concluded that this new method is feasible and economical and can be referenced by similar engineerings.
2007, 37(2): 103-106,102.
doi: 10.13204/j.gyjz200702026
Abstract:
Based on experimental research, the failure modes of adhesive anchorage system resist to pullout load are discussed. The failure of adhesive anchorage system can be derived from 5 factors: concrete failure, steel failure, adhesive failure, adhesives and concrete interface failure as well as steel and adhesive interface failure. Based on the features of different media in adhesive anchorage system, such as concrete, steel bar, adhesives, and bond-slide relationships between them, a finite element model for the analysis of multi-media system is proposed. A computer program is developed, whose result shows taht the calculated result coincides well with the test result.
Based on experimental research, the failure modes of adhesive anchorage system resist to pullout load are discussed. The failure of adhesive anchorage system can be derived from 5 factors: concrete failure, steel failure, adhesive failure, adhesives and concrete interface failure as well as steel and adhesive interface failure. Based on the features of different media in adhesive anchorage system, such as concrete, steel bar, adhesives, and bond-slide relationships between them, a finite element model for the analysis of multi-media system is proposed. A computer program is developed, whose result shows taht the calculated result coincides well with the test result.
2007, 37(2): 107-109.
doi: 10.13204/j.gyjz200702027
Abstract:
It is introduced how to strengthen and reconstruct the corroded chemical workshop, which is a multi-story-frame structure, so as to work out a concrete-mixing building that can carry two production lines.It is mainly described the strengthening plan design and key construction techniques.
It is introduced how to strengthen and reconstruct the corroded chemical workshop, which is a multi-story-frame structure, so as to work out a concrete-mixing building that can carry two production lines.It is mainly described the strengthening plan design and key construction techniques.
2007, 37(2): 110-111,83.
doi: 10.13204/j.gyjz200702028
Abstract:
As a multi-purpose media public building, Beijing Teisevision Center has many special equipment rooms in the basement, whose waterproofing is grade Ⅰ, as well as the layout of the foundation is complex, so the underground waterproofing is very important, especially the pile head. As the result of the comprehensive investigation and experts'demonstration, the underground waterproofing scheme of rigid-flexible combination, which is defined, which finally. All the work is done according to the specifications and the expected good effectiveness is obtained.
As a multi-purpose media public building, Beijing Teisevision Center has many special equipment rooms in the basement, whose waterproofing is grade Ⅰ, as well as the layout of the foundation is complex, so the underground waterproofing is very important, especially the pile head. As the result of the comprehensive investigation and experts'demonstration, the underground waterproofing scheme of rigid-flexible combination, which is defined, which finally. All the work is done according to the specifications and the expected good effectiveness is obtained.
2007, 37(2): 112-114.
doi: 10.13204/j.gyjz200702029
Abstract:
When the sections of a project are not in the through going shaft, the project's rotational angle is complicated. Axes controlling method for line setting need to move station many times and measuring error will accumulate rapidly. Polar coordinates method is more convenient. Outer controlling method is used for upright control under 0.000 and inner controlling method for above 0.000, thus the axes are controlled effectively. Elevations pass layer-by-layer, outer direction joint measuring can control the building rotation. The combination of different measuring methods can make good effect during tall building measuring. And the implementing method for settlement observation is also expounded.
When the sections of a project are not in the through going shaft, the project's rotational angle is complicated. Axes controlling method for line setting need to move station many times and measuring error will accumulate rapidly. Polar coordinates method is more convenient. Outer controlling method is used for upright control under 0.000 and inner controlling method for above 0.000, thus the axes are controlled effectively. Elevations pass layer-by-layer, outer direction joint measuring can control the building rotation. The combination of different measuring methods can make good effect during tall building measuring. And the implementing method for settlement observation is also expounded.
