Research On Seismic Performance And Design Calculation Method Of The Frame-composite Wall Structure System

ABSTRACT:The frame-multi-grid composite wall structure (FCWS) is a new type dual structure consisting of frame and multi-grid composite wall with outer frame. The dual structure is suitable well for the development trend of the frame structure at present, and expands the application scope for the multi-grid composite wall structure. Substituting the infill walls and the partitions of frame structure by RC multi-grid composite walls makes FCWS. Compared with frame structure, the construction cost of FCWS is not increased greatly, and the whole seismic performance of FCWS is improved effectively. There is an extensive application outlook and development space for FCWS in our country. Research on the seismic performance and design calculation method of FCWS is meaningful both in theory and in practice.Through model tests, numerical simulation and theoretical analysis of FCWS, and based on the prior related study results, follows aspects were investigated:seismic performance and vertical bearing capacity of the composite wall with outer frame, ultimate strength calculation method of the wall, cooperative work mechanism, design calculation methods of the structural system and the seismic construction measures. The results of this study provide a basis for more theoretical research and application of FCWS in practice. The main parts of work in the thesis are as follows:(1) Research on seismic performance and vertical load bearing capacity of the composite wall with outer frame through experiments.Cyclic reversed loading tests were conducted on composite wall with outer frame specimens and frame specimen without infill blocks of half scale. Failure process and the seismic performance including bearing capacity, stiffness, ductility and energy-dissipation capability were investigated. The tests results indicated that the composite wall with outer frame possessed good cooperative work performance and double anti-lateral force features, and the shear capacity and energy consumption of the composite wall with outer frame were better than those of common frame or frame with infill blocks significantly. The inner composite wall can share external load effectively in the whole process. It also possessed good ductility and bearing capacity, and can play an important role to dissipate energy at large displacement cyclic stage. Vertical load bearing capacity tests were conducted on composite wall with outer frame specimens and frame specimen without infill blocks of half scale. The test results indicated that the vertical load bearing capacity of the frame-composite wall was enough, and it was possible to construct middle-high building with the frame-composite wall structure system.(2) Research on calculation method of the ultimate bearing capacity of the composite wall with outer frame.Nonlinear finite element analysis of composite walls with outer frame was made using ANSYS program, and the results of FEA agreed well with those of experiments. Based on the experiments and FEA analysis, the general shear resistance mechanism of the wall was investigated. Through experiences and theoretical analysis, formula for calculating the shear load-bearing capacity of the frame-composite wall was proposed according to the ultimate balance theory. And its accuracy was verified by the test and FEA results.Research on the calculation method of normal section compression-bending capacity for the frame-composite wall was made. The simplified calculation model for the wall was proposed according to the special form of the wall. Based on assumption of section in plane, the ultimate strength calculation formulas of normal section of the composite wall with outer frame were proposed. In addition, the practical calculation formula of the axial load-bearing capacity of the wall was also proposed, and the accuracy of the formula was verified by FEA program.(3) Research on cooperative work mechanism of the frame-composite wall structure.Based on the fundamental theory of Timoshenko beam, the frame-composite wall structure is regarded as double anti-seismic system consisting of shear type frames and shear-flexural type cantilever beams. The fundamental differential equation of the displacement was established by the continuous approach, and its analytical solution of displacement and internal force were derived respectively.The arbitrary dual structure could be regarded as a dual structure consisting of two substructures in concept. Horizontal deformation of the substructure consists of bending deformation and shear deformation. The unified displacement differential equation of generalized structure with double resistance to lateral force was established by deformation continuation approach, and the unified displacement analytical solutions of the dual structure were derived which include bending deformation solution, shear deformation solution and the total deformation solution. Relation of the displacement calculation method among the frame-composite wall structure, the frame-shear wall structure and the dual structure with the multi-grid walls was discussed. (4) Research on seismic design calculation methods and construction measures of the frame-composite wall structure system.The frequency equation and the calculation formula of natural vibration period of the frame-composite wall structure were proposed. And the approximate calculation method of natural vibration period of FCWS was also proposed. Based on calculation of structural displacement and natural vibration period, calculation method of shear-sharing ratio for the frame-composite wall structure during elastic-plastic stage was proposed. Limits and control goals of storey drifts of FCWS at elastic and elastic-plastic stages were discussed based on the test results, architectural demanding, and the related codes.Based on the existing multi-grid structures in practice, the general regulations of the frame-composite wall structure, concerning with material performance, arrangement principle of the members, the appropriate maximum height of buildings, were presented. The construction technology and seismic measure details for the structure were discussed. According to the section forms and mechanism characters of grid beams and...