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

不列颠哥伦比亚省现有公路桥梁的抗震性能评估和改造

• 批准号: 419414-2011
• 负责人: Alam, Shahria
• 金额: $ 2.91万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=573832
• 关键词: Seismic; performance; evaluation; retrofitting; existing

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. Negligence of seismic issues pertaining to highway bridges in this seismic zone has resulted in a portfolio of existing bridges with seismic deficiencies that require immediate attention. The success of this project will have a profound impact on the improvement of current practices and help design engineers provide reliability based retrofit design of bridges considering several alternatives, which will help meet the need for the rehabilitation of Canadian bridge infrastructure. The significance of this research is paramount as it ensures improved safety and security against large magnitude earthquakes, and lead Canada to a sustainable solution for bridge infrastructure and its management.

近年来世界各地的地震事件表明，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。到目前为止，对不列颠哥伦比亚省常见桥梁的地震易损性和可行的改造策略进行评估的研究有限。需要可靠的方法来评估现有桥梁的地震易损性，特别是具有生命线特征的公路桥梁。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型框架结构，首先采用多个非线性滞回模型进行抗震性能评估。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采用各种替代方案改造的桥梁开展基于可靠性的抗震评估。将开发脆弱性曲线，以评估现有桥梁和改造桥梁的相对性能，考虑几个极限状态。可靠的脆弱性曲线的发展将允许准确的地震风险评估，桥梁改造的优先次序，地震后的紧急反应。桥梁清单、结构配置、几何形状和桥梁特性将从不列颠哥伦比亚省交通和建筑结构部获得。 由于对该地震带公路桥梁的抗震问题的忽视，导致现有桥梁的抗震缺陷需要立即引起注意。该项目的成功将对改善目前的做法产生深远的影响，并帮助设计工程师提供基于可靠性的桥梁改造设计，考虑几种替代方案，这将有助于满足加拿大桥梁基础设施的修复需求。这项研究的重要性是至关重要的，因为它确保了提高安全性和安全性，防止大规模地震，并导致加拿大的桥梁基础设施及其管理的可持续解决方案。