System Reliability for Evaluation and Design of Highway Bridges

本研究的主要目的是建立一个在钢混凝土公路桥梁评估和设计中考虑系统可靠度的框架。这项研究包括几个主要任务。在回顾了当前面向组件的方法和系统可靠性概念在桥梁评估和设计中的应用之后，将提出一种客观实用的基于系统的可靠性方法。在这方面，将根据负载和阻力系数设计方法考虑可用性和极限状态。使用增量加载故障树策略，将在桥梁评估和设计中引入系统因子修正器，以考虑桥梁系统中单个组件的存在和相互作用。通过这种方式，系统可靠性概念在推进桥梁评估和设计过程中的全部潜力将得以实现。一个由位于美国13个不同州的至少43座公路桥组成的数据库将用于演示和验证所提出方法的适用性。研究结果将对提高我国公路桥梁基础设施可靠性管理水平产生重大影响。事实上，所提出的桥梁体系可靠度方法将极大地帮助工程师在评估和设计公路桥梁时，在安全性和经济性方面做出更合理的决策

*** 9522166 Frangopol The main objective of this research is to develop a framework for considering system reliability in evaluation and design of steel and concrete highway bridges. The study consists of several major tasks. After a review of both the current component-oriented methodology and the applications of system reliability concepts in bridge evaluation and design, an objective and practical system-oriented reliability-based methodology will be proposed. In this regard, both serviceability and ultimate limit states will be considered based on the Load and Resistance Factor Design method. Using the incremental loading fault-tree strategy, system factor modifiers will be introduced in both bridge evaluation and design to account for the presence and interaction of individual components in the bridge system. In this manner, the full potential of system reliability concepts to the advancement of bridge evaluation and design processes will be realized. A data base consisting of at least forty-three highway bridges located in the U.S. in thirteen different states will be used to demonstrate and validate the applicability of the proposed methodology. The end result will have a significant impact on improving the management of the reliability of our highway bridge infrastructure. In fact, the proposed bridge system reliability methodology will greatly assist engineers in making more rational decisions with respect to both safety and economy in evaluating and designing highway bridges.***