Numerical Simulation of Seismic Responses of Asymmetric-Plan Reinforced Concrete Frame With Brbs

Abstract

As a kind of prospective energy dissipation and vibration reduction component, buckling-restrained brace (BRB) overcomes the buckling characteristics of conventional braces. When subjected to the frequent earthquakes, the BRBs are in elastic state, providing the stiffness for the main structure; when subjected to the rare earthquakes, they are in elasto-plastic state in the structure, providing the energy-dissipation capacity. This paper presents a 6-story reinforced concrete asymmetric frame with BRBs. The comparison of the seismic effects of the retrofitted structure using response spectra analysis and time history analysis under the frequent earthquakes proves that the model is reasonable. And we compare the drift ratio between frame with and without BRBs using time history under rare earthquakes. The results show that the BRBs can effectively control the structure under the action of earthquakes. And force-displacement relationship of BRB is perfect. In addition, the results of nonlinear analyses will be use in the test of BRB and the structure design.