Self-centering friction beam-column joint: A promising approach to seismic and progressive collapse resilience

Multi-hazard resilience is currently at the forefront of research in civil engineering. Progressive collapse and seismic collapse are two typical failure scenarios that buildings may suffer during their service life. One promising approach to enhancing seismic resilience of frames is the use of self-centering beam-column joints. Although these joints offer significant seismic benefits, their resistance mechanism against progressive collapse remains unclear. To address this issue, this paper focuses on the high seismic resilience self-centering friction frame and establishes a numerical analysis model for self-centering friction beam-column substructures (SCFS), validated by experimental data. Then, the progressive collapse process and resistance mechanism of SCFS under the scenario of mid-column failure are investigated. Finally, the influence of design parameters on the progressive collapse resistance of SCFS are also discussed. Results demonstrate that the load-carrying capacity of SCFS is predominantly achieved through the flexural action and catenary action. When compared to ordinary reinforced concrete substructures (ORCS) of identical dimensions and reinforcement, the load-carrying capacity of SCFS at combined flexural action and compressive arch action phase is 13.5 % lower than that of ORCS, while the load-carrying capacity at catenary action phase is 42.5 % higher than that of ORCS. Additionally, the span-to-depth ratio of the beam, reinforcement ratio of the intact beam section, and activation force of the self-centering connector have the most significant impact on the progressive collapse resistance of SCFS.