Seismic performances of reinforced concrete wall-frame structural systems were investigated through a shaking table test and three-dimensional nonlinear frame analyses. A reinforced concrete wall-frame building with soft first story was designed as a prototype structure for this study. A one-third scaled model of the prototype structure was tested on the Large-scale Earthquake Simulator, NIED, Japan. The testing methods and major findings were reported herein. The three-dimensional nonlinear dynamic analysis of the test structure was conducted using a four-node isoparametric element model, which was based on the two-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 and the story yielding in the soft first story of the test structure, which was due to the shear softening of shear wall. Moreover, the effects of the shear softening of shear wall on responses of fifteen wall-frame buildings with different number of stories and different column and wall sections, which included regular buildings as well as vertically irregular ones, were investigated through three-dimensional nonlinear pushover analyses.
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