Long-Term Reliability of Structural Systems

9872342 Mahadevan本研究的目的是开发一种实用的方法来估计机械和结构系统的时变可靠性。 目前使用的分析方法有几个简化的假设有关的负载和变形阻力，降低其适用于实际结构。 该项目将开发一种基于模拟的方法，该方法具有鲁棒性、易于实施和可视化以及模拟现实情况的能力等优点。 该方法将是足够普遍的，包括韧性和脆性结构行为。 将发展一种自适应重要抽样模拟技术来估计系统在不同时刻的可靠性。 一个重要的故障序列的结构是自适应模拟的起点。 本项目将把重要性抽样的思想扩展到具有多个失效序列和时变载荷和变形抗力的结构。 ***

9872342 Mahadevan The objective of this study is to develop a practical method to estimate the time-variant reliability of mechanical and structural systems. Currently used analytical methods have several simplifying assumptions regarding the loads and the resistance to deformation which lower their applicability to practical structures. The project will develop a simulation- based methodology which has advantages of robustness, ease of implementation and visualization, and the capability to model realistic situations. The methodology will be sufficiently general to include ductile and brittle structural behavior. An adaptive importance sampling simulation technique will be developed to estimate the system reliability at different instances of time. A significant failure sequence of the structure is the starting point for the adaptive simulation. This project will extend the idea of importance sampling to structures with multiple failure sequences and time-varying loads and resistance to deformation. ***