Risk Assessment of Bridges under Multihazard Effect of Earthquake and Flood-Induced Scour

地震和洪水冲刷多重灾害作用下桥梁的风险评估

• 批准号: 1131359
• 负责人: Swagata Banerjee
• 金额: $ 25万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1131359&HistoricalAwards=false
• 关键词: Risk; Assessment; Bridges; under; Multihazard

The occurrence of earthquakes in the presence of flood-induced scour is a critical multi-hazard scenario for bridges located in seismically-active flood-prone regions. The objective of this research is to study the impact of this multi-hazard scenario on the design of bridges. An analytical multi-hazard framework will be formulated to assess the reliability of representative bridges located in three seismically-active, flood-prone regions of US and to quantify risk associated with these bridges under the combined effect of earthquake and scour. Regional flood hazard curves will be developed and multi-hazard scenario for bridges will be characterized by combining these hazard curves with regional seismic hazards. Bridge scour calculated from developed flood hazard curves will be incorporated in finite element analyses. Reliability analysis will be performed to assess the variability of bridge performance due to uncertainties involved in various analysis modules. Results will be presented in forms of (i) fragility surfaces and curves and (ii) risk curves for different multi-hazard scenarios. The multi-hazard analysis framework will be used to investigate the effectiveness of several seismic retrofit techniques for bridges under earthquakes in the presence of flood-induced scour. On completion of this research, the profession will have access to a comprehensive knowledge-base on bridge performance under multi-hazard effect of seismic and flood-induced scour. Results can be utilized further for loss estimation of bridges located in the study regions and for performance evaluation of highway transportation networks under future events. This research is designed to educate graduate and undergraduate students on multiple phases of multi-hazard risk assessment. Several online modules will be developed which will enable educators, state DOTs and practicing engineers to utilize the research outcome for their respective purposes.

对于位于地震活跃的洪水易发地区的桥梁来说，在洪水引起的冲刷的情况下发生地震是一种严重的多重灾害情况。 本研究的目的是研究这种多重灾害场景对桥梁设计的影响。 将制定一个分析性多灾害框架，以评估位于美国三个地震活跃、洪水多发地区的代表性桥梁的可靠性，并量化这些桥梁在地震和冲刷综合作用下的相关风险。 将开发区域洪水灾害曲线，并通过将这些灾害曲线与区域地震灾害相结合来表征桥梁的多灾害场景。 根据开发的洪水灾害曲线计算的桥梁冲刷将纳入有限元分析。 将进行可靠性分析，以评估由于各种分析模块中涉及的不确定性而导致的桥梁性能的可变性。结果将以 (i) 脆弱性曲面和曲线以及 (ii) 不同多灾害情景的风险曲线的形式呈现。 多灾害分析框架将用于研究在洪水冲刷存在的地震下桥梁的几种抗震改造技术的有效性。 完成这项研究后，专业人士将获得有关地震和洪水冲刷多重灾害影响下桥梁性能的综合知识库。 结果可进一步用于研究区域桥梁的损失估计以及未来事件下公路交通网络的性能评估。 这项研究旨在教育研究生和本科生进行多灾害风险评估的多个阶段。将开发几个在线模块，使教育工作者、州交通部和执业工程师能够将研究成果用于各自的目的。