Seismic performance analysis of PBL gusset connections in buckling-restrained braced RC frames

The implementation of buckling-restrained braces (BRBs) in new reinforced concrete frames (RCFs) is more susceptible to the complex gusset connection between BRBs and the framing members. In this paper, a novel gusset connection with the L-shape perfobond strip (PBL) group was proposed to ease the installation and exhibit more reliable BRB-to-RC joints in new BRB-RCFs. Finite element (FE) monotonic pushover analysis was conducted to investigate the mechanical property of the L-shape PBL group, in terms of the effect of the gusset plate thickness, PBL arrangement and transverse rebars. An empirical formula was suggested for the optimal PBL gusset plate thickness. To gain insights into the seismic performance of the application of the PBL gusset connection in BRB-RCFs, the BRB-RCF subassemblage FE model was constructed and verified by the full-scale test. The analysis results showed that the BRB-RCF subassemblage exhibited a full hysteretic curve and more than 60% of energy was dissipated by the BRB. The gusset connection basically remained in the elastic stage and no significant damage could be observed even at 3% interstory drift ratio (IDR), which indicated that the proposed connection was effective. •The mechanical behavior of the L-shape PBL group was investigated.•The optimal thickness formula of the PBL gusset plate was suggested.•The numerical analytical model of the BRB-RCF subassemblage was established.