系统可靠度约束下平面框架结构的优化设计

以结构系统的可靠度作为结构优化设计的控制参数，用分枝限界法判认主要失效模式。用ＰＮＥＴ法计算结构系统的可靠度，导出了平面框架结构系统可靠度的敏度分析表达式。

Optimization Design for Plane Frame Structure Under Reliability Constraints of System

In this paper, the reliability of structural system is regarded as the control parameter for the structural optimization design. The significant failure modes are identified by using the branchand bound method. The reliability of structural system is evaluated by PNET method. The expression of sensitivity analysis for the plane frame structural system reliability is derived. The optimum design problem with the constraint of structural system reliability is solved by using the sequential approximate programming technique based on the first order Taylor series expansion of constraint function and dual theory of nonlinear programming method. Several examples are evaluated, and the results demonstrate that the method presented in the paper is effective.