Seismic Responses of All-Steel Self-Centering Buckling-Restrained Braced Frame
ZHANG Hui1, ZENG Peng2, WANG Chun-Lin3
1.Department of Architecture and Civil Engineering, Jinken College of Technology, 211156, Nanjing, China; 2.East China Electric Power Design Institute Co., Ltd., 200063, Shanghai, China; 3.Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, 210096, Nanjing, China
Abstract：
In order to investigate the seismic performance of all-steel self-centering BRB (SCBRB) frames, a conventional BRB frame was designed as a reference structure. Based on the equal-strength principle and the self-centering requirement, the number of prestressed tendons was varied with the determination of the area of the core plate, to study the effect on the seismic response of the SCBRB frames. Analysis showed that the inter-story ratio of the SCBRB frame was less than that of the corresponding BRB frame designed with the equal-strength principle. With more tendons in the SCBRB, the stiffness of the SCBRB became larger, but the inter-story ratio of the frame and the demand of the ductility of the brace became smaller. The floor acceleration increased considerably, as well as the shear force, which is mainly sustained by the SCBRB other than the columns. The ductility of the SCBRB increased due to the reduced initial tensile strain, so there is an optimal number of tendons to make the performance of the SCBRB meet the demands.
