Long-Term Reliability of Structural Systems

9872342马哈德文：这项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对荷载和变形抗力有几个简化的假设，这降低了它们对实际结构的适用性。该项目将开发一种基于模拟的方法，该方法具有健壮性、易于实施和可视化以及能够模拟现实情况的优势。该方法将足够普遍，以包括延性和脆性结构行为。为了估计系统在不同时刻的可靠性，将开发一种自适应重要抽样仿真技术。结构的重要失效序列是自适应仿真的起点。该项目将把重要性抽样的思想推广到具有多个失效序列和时变荷载且具有抗变形能力的结构。***

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. ***