ANALYSES OF REINFORCED CONCRETE WALL-FRAMESTRUCTURAL SYSTEMS CONSIDERING SHEAR SOFTENING OFSHEAR WALL

摘要

Seismic performances of reinforced concrete wall-frame structural systems were investigated through ashaking table test and three-dimensional nonlinear frame analyses. A reinforced concrete wall-framebuilding with soft first story was designed as a prototype structure for this study. A one-third scaled modelof the prototype structure was tested on the Large-scale Earthquake Simulator, NIED, Japan. The testingmethods and major findings were reported herein. The three-dimensional nonlinear dynamic analysis ofthe test structure was conducted using a four-node isoparametric element model, which was based on thetwo-dimensional constitutive law for reinforced concrete panel elements, in order to verify its reliability.This analytical model could simulate the displacement concentration, the shear failure of shear wall andthe story yielding in the soft first story of the test structure, which was due to the shear softening of shearwall. Moreover, the effects of the shear softening of shear wall on responses of fifteen wall-framebuildings with different number of stories and different column and wall sections, which included regularbuildings as well as vertically irregular ones, were investigated through three-dimensional nonlinearpushover analyses.