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

近期世界各地发生的地震事件表明，桥梁结构在地震中的易损性。加拿大西海岸被认为是最容易发生地震的地区。到目前为止，评估不列颠哥伦比亚省常见桥梁的地震脆弱性和可行的翻新战略的研究有限。需要可靠的方法来评估既有桥梁，特别是具有生命线特征的公路桥梁的地震易损性。S框架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框架具有进行静力和动力时程分析的能力。在本工程中，将使用S框架，它将首先配备几个非线性滞回模型，以便准确地评估抗震性能。拟议的研究将侧重于对不列颠哥伦比亚省现有公路桥以及采用各种替代方案翻新的桥梁进行基于可靠性的抗震评估。在考虑几种极限状态的情况下，易损性曲线将被用来评估既有桥梁和加筋桥梁的相对性能。开发可靠的易损性曲线将使准确的地震风险评估、桥梁翻新优先顺序和地震后应急反应成为可能。桥梁的库存、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.