System Reliability for Evaluation and Design of Highway Bridges

* 9522166 Frangopol本研究的主要目的是开发一个框架，考虑系统的可靠性评估和设计的钢和混凝土公路桥梁。 这项研究包括几项主要任务。 在回顾了当前的面向构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，将提出一个客观和实用的面向系统的基于可靠性的方法。 在这方面，将根据荷载和抗力系数设计方法考虑正常使用和极限状态。 使用增量加载故障树策略，在桥梁评估和设计中引入系统系数修正值，以说明桥梁系统中各个部件的存在和相互作用。 通过这种方式，将实现系统可靠性概念对桥梁评估和设计过程进步的全部潜力。 一个数据库，包括至少43个公路桥梁位于美国13个不同的州将被用来证明和验证所提出的方法的适用性。 最终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，所提出的桥梁系统可靠性方法将大大有助于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.***