Elasto-plastic Dynamical Analysis Of RC Special-shaped Column Structure And Performance-Based Seismic Design Research

The frame structure with special-shaped column excels in no prominence on the wall, enlarging useful chamber area, lightweight, according with the direction of wall material reformation. There is much test research about special-shaped column frame structure, but so lack about its elasto-plastic performance theory research in the strive earthquake. In this paper, the author chooses a representative building scheme, design the structure with RC frame, special-shaped column frame and short-leg shear wall. The author analysis 3-dimension elsato-plastic performance of three type of building structures in 7 and 8 defending intensity with the help of CANNY program. In the process, the author finds that the structure can't meet the regulation of seismic code in 8 defending intensity. So we adopt the frame structure with the special-shaped and bracing, and compare the structure seismic performance of several bracing-setting schemes.In Performance-Based Seismic design, the quantitative parameter of structural earthquake response can be gained according to the deformation-based or energy-based computation method .The computation of deformation or energy must be based on the nonlinear time-history analysis of structure. Some problems such as the element model, the hysteresis model in the nonlinear time-history analysis of RC structure are summarized in the paper. According to the result of 3-dimension elasto-plastic time-history analysis, the author compares the seismic capability of these structures. The conclusions are of referential values for seismic design for similar structures.Time-history analysis requires much time, workload and high capability computers. The evaluation of result requires much theory knowledge. So, this way is hard to spread. The engineers need a simple method. In this paper, the author analyses the special-shaped column structure and special-shaped column with bracing with the help of improved capacity spectrum method. The results were compared with those of time-history analysis. It indicates that improved capacity spectrum method is a simple and practical method and can be used to evaluate the structure seismic capability approximately.