Seismic performance evaluation and retrofitting of existing highway bridges in British Columbia

近年来世界各地的地震事件都表明桥梁结构在地震中的脆弱性。加拿大西海岸被认为是最容易发生地震的地区。迄今为止，对不列颠哥伦比亚省常见的桥梁的地震脆弱性和可行的改造策略进行评估的研究有限。现有桥梁，特别是具有生命线特征的公路桥梁，需要可靠的地震易损性评估方法。S-Frame软件公司是世界领先的结构工程分析和设计软件公司，其S-Frame能够进行静态和动态时程分析。本工程将采用s -框架，首先将其配备几个非线性滞回模型，以便准确地评估其抗震性能。拟议的研究将侧重于为不列颠哥伦比亚省现有的公路桥梁以及用各种替代方案改造的桥梁开发基于可靠性的地震评估。将开发脆性曲线来评估现有桥梁和考虑几种极限状态的改造桥梁的相对性能。制定可靠的易损性曲线将有助于进行准确的地震风险评估，确定桥梁改造的优先次序，以及震后应急响应。桥梁的清单、结构配置、几何形状和特性将从不列颠哥伦比亚省交通和基础设施部获得。

Recent seismic events all over the world have shown the vulnerability of bridge structures during earthquakes. The west coast of Canada is considered the most seismic prone region. There has been limited research to date to evaluate the seismic vulnerability and viable retrofit strategies for the bridges that are common in British Columbia. There is a need for reliable methods for assessing the seismic vulnerability of existing bridges, particularly highway bridges having lifeline characters. S-Frame Software Inc is a world leading Software Company in structural engineering analysis and design where its S-Frame is capable to conduct both static and dynamic time-history analysis. In this project S-Frame will be utilized, which will be first equipped with several nonlinear hysteretic models for accurate seismic performance evaluation. The proposed research will focus on developing reliability-based seismic assessment for existing highway bridges in British Columbia and also bridges retrofitted with various alternatives. Fragility curves will be developed to assess the relative performance of existing bridges and retrofitted bridges considering several limit states. The development of reliable fragility curves would allow for accurate seismic risk assessment, bridge retrofit prioritization, post-earthquake emergency response. The bridge inventory, structural configuration, geometry, and properties of the bridges will be obtained from British Columbia Ministry of Transportation and Infrastructures.