Increase in the frequency of flash floods owed to climate change, excessive sand mining, and urbanisation of watersheds has accelerated the need to quantify the structural effect of scour-induced structural damages in masonry arch bridges. The structural effects of scour-induced rotation are unaddressed in literature. In this context, a mechanism-based framework based on limit state principles is developed for masonry arch bridges subjected to scour-induced rotation. Critical collapse mechanisms caused by scour-induced rotation are identified, and analysis framework is developed using rigid-body kinematics. The spectrum of bridges under consideration is classified into subsets, and an assessment scheme is developed using fragility curves as a function of scouring location as well as bridge typology.

由于气候变化，过多的沙子开采和集水区的城市化而导致的山洪泛滥的频率增加，加速了对在砖石拱桥中冲刷引起的结构破坏的结构效应进行量化的需求。冲刷引起的旋转的结构效应在文献中未提及。在这种情况下，针对受冲刷引起的旋转的砌体拱桥，开发了基于极限状态原理的基于机制的框架。确定了由冲刷引起的旋转引起的严重坍塌机制，并使用刚体运动学开发了分析框架。所考虑的桥梁频谱被划分为子集，并使用脆性曲线作为冲刷位置和桥梁类型的函数来开发评估方案。