Modular steel construction (MSC) has emerged as a promising solution to address the increasing demands for temporary and transitional buildings. However, existing inter-module connections face challenges in balancing self-locking performance and disassembly efficiency, which greatly limits the full potential of MSC. A new self-locking and rapid-unlocking (SelRU) connection recently proposed by the authors has demonstrated its excellent connectivity, assembly/disassembly functionality, and reusability potential. Nevertheless, the understanding of its fundamental mechanical behavior, particularly its bending performance, remains limited. To address this gap, this study first investigated the bending performance of the SelRU connection through two full-scale four-point cyclic bending experiments, with disassembly operations carried out at critical loading stages. The experimental results show that the SelRU connection achieved higher yield moment, ultimate moment, and initial stiffness compared to four existing inter-module connections. Subsequently, finite element models were developed and validated against experimental results. The load transfer and failure mechanisms of the SelRU connection under bending were revealed by analyzing the distribution and development of von Mises stress as well as rupture index at critical sections of the bolt latch and lock cylinder. Finally, the effects of key parameters on the bending capacity and fracture risk of the connection were examined, including the diameter of the lock cylinder, the thickness of the bolt latch, and the angular deviation of the lock cylinder.
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