Research On The Performance-based Seismic Design Method Of Shear Wall

Earthquake experiences and experimental researches indicate that the collapse of structure is mainly due to their poor deformation capacity compared with the high deformation demand. The deformation capacity of shear wall cannot be evaluated through the bearing capacity-based design method, while its deformation capacity can be determined quantitatively according to the deformation demand through the performance-based seismic design method. RC shear walls that are designed through bearing capacity-based design method have some certain reliability in ensuring the capacity, but cannot predict the real response of the structures under the rare earthquake or even the design earthquake. With the rapid advent of the complex structures in the recent years, Chinese structural experts propose to implement structural design of those buildings under moderate earthquake. Those methods are named as "elastic design" and "non-yielding design" under moderate earthquake. Performance-based seismic design of shear wall research is less. The main contents in this paper are as follows:(1) The concept and design parameters of these two methods were compared in this paper. Comparative analysis of internal force under different seismic fortification levels was conducted, and design proposal in seismic design was given. At the same time, those buildings under moderate earthquake is likely to cause damage layer up. Nonlinear elasto-plastic time history analysis for a real structure is realized by ABAQUS program.(2) The performance-based seismic design methodology is applied to the design of concrete shear wall in this paper. The influence of the characteristic value of stirrup content and the displacement ductility ratio under the allowable axial load ratio for concrete structural walls was studied. A calculation method for the deformation ductility ratio of shear walls is established with consideration of the confinement of boundary zones at both eages. The influence of axial compression ratio n, wall aspect ratio r and the characteristic value λw of stirrup in confined boundary zone on the ductility of the walls are studied.The experimental of 10 RC shear walls subjected to horizontal cyclic loading with different axial compression ratio were conducted to verify the proposed calculation method. A structure is analyzed by pushover method with YJK and MIDAS, and the structural performance under moderate and severe earthquake are obtained(3) 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. Deformation capacity of coupling beams is influenced by relative depth coefficient of axial compression ratio, span ratio, and concrete confinement. In this paper, the relationship of the confining reinforcement characteristic value λw, relative depth coefficient of compression zone ζ. span ratio x and the curvature ductility μ was established first. Then, the relationship was verified by the RC coupling beam experiments which were conducted by 46 coupling beams experiments. Based Oil the relationship, performance-based seismic design method for RC coupling beams was proposed.