Study On The Performance-based Seismic Design Method For Shear Wall Structures

Performance-based seismic design means confirming the performance aim of building under different protect level in order to gain an expected function when meeting a certain earthquake in the future, and to reduce the cost of the building to the lowest level during the whole lifespan under the potential earthquake according to the building importance and function. Performance-based seismic design has attracted an increased interest among researchers and engineers since it is proposed in 1990's. And now performance-based seismic design has become the main development direction of the seismic code mending.In this article, the performance-based seismic design method of the shear wall structure and the member design is developed. The main investigation contains:The method is discussed on how to classify the protect level and the performance aim of the shear wall structures. The performance research achievement in the world is generalized, and the "4 level" seismic protection level according to different probability level is put forward. The performance state of the shear wall structures under different performance level is described. The drift angle range of every performance level is defined. The performance level of the shear wall structures is connected to the member drift angle and the performance level is quantified based on the test statistical data.The damage index level range of different performance level based on the research achievement in the world about the member damage, structure damage is introduced. A damage index scope adopted under different performance level is recommended. The macrograph behavior of the damage is described, the damage degree to each performance level is summarized, and the detail of the damage degree is quantified. The damage model of the shear wall is analyzed, each damage model by the test data and evaluates the current damage model is compared.The performance-based seismic design method procedure is discussed. The inelastic seismic design spectra are used as the displacement response evaluation method in the inelastic stage, and are applied to the performance design of shear wall structures. The research achievement of the pushover method in the world is generalized. Based on the research analysis, a suit of performance-based design procedure is defined. The constructional detail of the performance-based design of the shear wall design is illustrated.A systematic research on each parameter of the shear walls are developed through the cyclic loading testes of the shear walls. The various parameters including axial ratio, aspect ratio, concrete strength, boundary longitudinal reinforcement ratio, confined area length and boundary stirrup ratio. Based on the tests, research and analysis on the affection of the design parameter are developed. The affection of the parameters on the seismic performance of the shear walls are fitted, and a suit of detailed member design procedure of the seismic performance design based on the test are summarized..The tests provide a basis leading to a further comprehension of the seismic performance.The deformation capacity is followed with great interest in inelastic stage. The discussion on the evaluation method of the current code on the resistant capacity, the evaluation on the yield drift angle, the peak point drift angle and the ultimate drift angle of different section are studied. The relationship between each parameter to the controlled points is investigated, and the detailed shear wall section design procedure is proposed.In the end, the procedure of the performance-based seismic design method for shear wall structures is illustrated by an example. Using the CANNY program as the analyze method; the seismic behavior of the structure under the excitation of 9 earthquake ground motion records is analyzed. The result illustrate that the time history result follow the deformation aim calculated through the inelastic seismic design spectra method. The inelastic displacement spectra method is a reliable inelastic deformation evaluation method of the shear wall structures. Through the checking calculation and adjusting of the parameter of the shear wall using the deformation aim gained from the inelastic displacement spectra method and the fitted drift angle evaluation function of deferent performance level, the performance level of the shear wall could he realized.