System Reliability for Evaluation and Design of Highway Bridges

*9522166 Frangopol本研究的主要目标是开发一个框架，用于在钢和混凝土公路桥梁的评估和设计中考虑系统可靠性。这项研究由几项主要任务组成。在回顾了现有的面向构件方法和系统可靠性概念在桥梁评估和设计中的应用的基础上，提出了一种客观实用的面向系统的可靠性方法。在这一点上，基于荷载和阻力系数设计方法，将同时考虑正常使用状态和极限状态。采用增量加载故障树策略，在桥梁评估和设计中引入系统因素修改器，以考虑桥梁系统中各个部件的存在和相互作用。通过这种方式，系统可靠性概念对推进桥梁评估和设计过程的潜力将得到充分发挥。一个由美国13个不同州的至少43座公路桥组成的数据库将被用来演示和验证所提出的方法的适用性。最终的结果将对改善我国公路桥梁基础设施的可靠性管理产生重大影响。事实上，提出的桥梁系统可靠性方法将极大地帮助工程师在评估和设计公路桥梁时从安全和经济两个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.***