中文摘要：

为了更为准确地评估钢框架系统可靠性,将实际的半刚性连接节点视为转动弹簧单元,推导了半刚性梁元节点失效的减缩刚度矩阵和等效节点力公式.采用分枝限界法研究了半刚接框架的系统强度可靠性,并与刚接和铰接结构进行了对比.算例表明,含有半刚性节点的主要失效路径和失效概率发生了较大变化,其系统可靠性介于刚接与铰接结构之间,节点刚度对钢框架系统可靠性的影响较大.

英文摘要：

To evaluate more exact system reliability of steel frame, taking the actual semi-rigid joint as a rotational spring element, formulae of the reduced stiffness matrix and the equivalent nodal force of beam element with semi-rigid joints are deduced. The method of branch boundary is adopted. The strength reliability of the semi-rigid steel frame system is studied and compared with that of fully-rigid and pined connections. The example indicates that there are real differences in the main failure path, its failure probability and system reliability between the semi-rigid connections and the fully-rigid or pinned connections and that the effects of joint stiffness on the strength reliability of steel frame are important.