Long-Term Reliability of Structural Systems

[872342] 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。目前常用的分析方法对荷载和变形抗力的假设过于简化，降低了其对实际结构的适用性。该项目将开发一种基于仿真的方法，该方法具有鲁棒性，易于实现和可视化，以及模拟现实情况的能力。该方法将足够通用，包括韧性和脆性结构行为。将开发一种自适应重要抽样仿真技术来估计系统在不同时间实例下的可靠性。结构的重要失效序列是自适应仿真的起点。本项目将重要抽样的思想扩展到具有多个破坏序列、时变载荷和抗变形能力的结构。* * *

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. ***