Investigation on the interaction between BRBs and the RC frame in BRB-RCF systems. (15th September 2021)

• Record Type: Journal Article
• Authors: Bai, Jiulin; Chen, Huiming; Jin, Shuangshuang
• Is Part Of: Engineering structures. Volume 243(2021)
• Publication Date: 2021-09-15
• Subjects: Buckling-restrained braces -- Reinforced concrete frames -- Interaction -- Pushover analyses -- Cyclic loading analyses; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2021.112685
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: A series of BRB-RCFs and the corresponding bare frames and BRB systems were designed. The effectiveness of BRBs in BRB-RCFs with different numbers of stories and story shear ratios p was assessed. The effect of BRBs on the overall performance of RC frames was investigated. Abstract: Due to the different mechanical behavior of buckling-restrained braces (BRB) and reinforced concrete frames (RCF), their coupled work in dual structural systems (BRB-RCFs) is complicated, especially their earthquake responses. A series of structures with different numbers of stories and different story shear ratios equipped with BRBs were designed and tested in simulation. Static nonlinear pushover analysis and cyclic loading were simulated to investigate the interaction between BRBs and RCFs. The capacity curves, the story distributions of shear force, axial forces on the columns, strength and stiffness, lateral displacement, interstory drift ratios and hysteresis behavior were evaluated. Adding BRBs in a RCF was found to alter the story distribution of shear force and to significantly increase the axial demands on RC columns in BRB-braced bays. The yield strength, initial elastic stiffness and energy dissipation capacity of BRB-RCF structures are all greater than the sum of the contributions from the braces and the frames independently. That synergistic interaction cannot be ignored in design.