Seismic design of reinforced concrete frame-shear wall structure based on yield point spectra

According to the multiple performance objectives including the Life Safety objective under moderate earthquake and the Collapse Prevention objective under rare earthquake, a displacement-based seismic design method was presented for the reinforced concrete (RC) frame-shear wall structure. For each performance level, roof drift, interstory drift of the structure and plastic hinge rotation at the base of the wall were selected to be the primary performance parameters. An nominal yield displacement corresponding to the first mode of structure was estimated based on the equivalent single-degree-of-freedom (ESDOF) system, then the required maximum base shear force was determined by using Yield Point Spectra (YPS) considering the inelastic demand, which is formed by the acceleration response spectrum. The base force proportion taken by total frame and total shear wall may be assumed by designers and engineers, and the nominal bending moment for each wall branch was assigned in proportion to the square of actual or equivalent length of wall. A ten-story RC frame-shear wall structure was taken as an example to demonstrate the design process of the method in detail. Furthermore, subsequent nonlinear dynamic analyses were performed using the computer program PERFORM-3D. The analysis results show that the proposed method is sufficiently accurate for design, and can be referred for the inelastic structural design within a certain range of building floors. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.