Seismic Response of Concrete Gravity Dams Subjected to Spatially Variable Excitations

空间变量激励下混凝土重力坝的地震响应

• 批准号: 1129396
• 负责人: Aspasia Zerva
• 金额: $ 25.99万
• 依托单位: Drexel University
• 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 2017-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1129396&HistoricalAwards=false
• 关键词: Seismic; Response; Concrete; Gravity; Dams

Concrete gravity dams are critical infrastructure serving electricity generation, water supply, flood control, irrigation and recreation. Large concrete dams would most likely experience different earthquake induced motions at different points on their base during an earthquake. This spatial variation of the motions is commonly ignored in the seismic design of these massive structures, although it may induce more severe response patterns in the structures, which may potentially pave the way for the loss of the reservoir and ensuing devastation. This project will comprehensively study the effect of the spatial variability of the ground motions on a few carefully selected concrete gravity dams from the nation?s inventory exposed to seismic excitations pertinent to their sites. The study will involve detailed numerical modeling and dynamic analysis of dam systems to accurately include the complex nonlinear material behavior and interactions of the dam concrete, foundation rock and water in the reservoir. The project will provide the methodology and framework for the evaluation of the effect of spatially variable ground motions on the response of concrete gravity dams. Based on the research results, recommendations for incorporating the effect of spatial variability of seismic motions in the design and retrofit of dam structures will be made.The research results will enable engineers to design safer concrete gravity dams and to evaluate the performance of existing dams to identify those posing significant hazard to the community in terms of expected casualties and economic losses. The outcomes of the study will be directly disseminated to the profession via publications and presentations. The numerical codes and data generated with this project will be posted on a web site for use by researchers and practicing engineers. This will eventually enhance the safety of the nation?s vital infrastructure. The research will also provide advanced training to graduate and undergraduate students. Underrepresented groups will be recruited in the project using well established institutional partnerships.

混凝土重力坝是发电、供水、防洪、灌溉和娱乐的重要基础设施。大型混凝土坝在地震期间很可能在其基础上的不同点处经历不同的地震诱发运动。这种运动的空间变化在这些大型结构的抗震设计中通常被忽略，尽管它可能会在结构中引起更严重的响应模式，这可能会为水库的损失和随后的破坏铺平道路。本项目将全面研究地震动的空间变异性对国内精选的几座混凝土重力坝的影响。的库存暴露在地震激励有关的网站。这项研究将涉及详细的数值建模和大坝系统的动态分析，以准确地包括复杂的非线性材料行为和大坝混凝土，基岩和水库中的水的相互作用。该项目将提供的方法和框架的空间变化的地面运动对混凝土重力坝的反应的影响进行评估。根据研究结果，我们会建议在设计和改建水坝时，考虑地震运动空间变异的影响。研究结果将有助工程师设计更安全的混凝土重力水坝，并评估现有水坝的性能，以确定那些在预期伤亡和经济损失方面对社区构成重大危害的水坝。研究结果将通过出版物和介绍会直接传播给业界。该项目产生的数字代码和数据将发布在网站上，供研究人员和执业工程师使用。这最终会增强国家的安全吗？的重要基础设施。这项研究还将为研究生和本科生提供高级培训。将利用已建立的机构伙伴关系，在项目中征聘代表性不足的群体。