Stability of Elastomeric and Lead-Rubber Seismic Isolation Bearings Under Extreme Earthquake Loading

弹性和铅橡胶隔震支座在极端地震荷载下的稳定性

• 批准号: 1031362
• 负责人: Gordon Warn
• 金额: $ 17万
• 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: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1031362&HistoricalAwards=false
• 关键词: Stability; Elastomeric; Lead; Rubber; Seismic

The research objective of this project is to develop improved methods for modeling and predicting the stability limit of elastomeric and lead rubber seismic isolation bearings. Elastomeric and lead-rubber isolation bearings are used for seismic isolation of building and bridge structures to reduce the damaging effects of strong ground shaking. The Elastomeric bearings consist of alternating layers of rubber bonded to intermediate steel shim plates and the lead-rubber bearings have an additional lead plug inserted into a central hole. During severe earthquake ground shaking, these isolation bearings are likely to be subjected to simultaneous large lateral displacements and axial compressive loads that could cause bearing instability. This research will identify the fundamental mechanism(s) causing bearing instability through detailed nonlinear finite element analysis and component level testing. These studies will aid in the development of an improved macro-model capable of capturing bearing instability and the derivation of a mechanics-based closed-form expression for predicting the bearing stability limit state.The results of this research will provide tools to improve the assessment of bearing safety for the design of isolation systems composed of elastomeric or lead-rubber bearings. This research will also develop improved macro-models for rapid numerical earthquake simulation that will provide new knowledge about the performance of isolated structures under extreme earthquake loads. This new knowledge would lead to innovative solutions to modify and enhance the response of individual bearings to achieve a desired system performance. The results will be disseminated broadly to the research and design communities through journal publications, seminars, conference sessions and design recommendations. The project will provide advanced training to graduate students with professional development opportunities of presenting their work at technical meetings and conferences. This project will also recruit undergraduate students from diverse backgrounds to participate in structural engineering research and to pursue a graduate education in civil engineering through Penn State's Office of Engineering Diversity's Summer Research Program (SROP) program.

该项目的研究目标是开发改进的方法来建模和预测弹性体和铅橡胶隔震支座的稳定性极限。弹性和铅橡胶隔震支座用于建筑物和桥梁结构的隔震，以减少强烈地面震动的破坏性影响。弹性轴承由粘合到中间钢垫板的交替橡胶层组成，铅橡胶轴承有一个插入中心孔的附加铅塞。在严重的地震地面震动期间，这些隔震支座可能会同时承受较大的横向位移和轴向压缩载荷，从而导致支座失稳。这项研究将通过详细的非线性有限元分析和部件级测试来确定导致轴承不稳定的基本机制。这些研究将有助于开发一种改进的宏观模型，能够捕获轴承的不稳定性，并推导基于力学的封闭式表达式来预测轴承稳定性极限状态。这项研究的结果将为改进由弹性体或铅橡胶轴承组成的隔震系统设计的轴承安全性评估提供工具。这项研究还将开发用于快速数值地震模拟的改进宏观模型，这将提供有关极端地震荷载下隔离结构性能的新知识。这些新知识将带来创新的解决方案，以修改和增强单个轴承的响应，以实现所需的系统性能。研究结果将通过期刊出版物、研讨会、会议和设计建议广泛传播给研究和设计界。该项目将为研究生提供高级培训，并提供在技术会议和会议上展示其工作的专业发展机会。该项目还将招收来自不同背景的本科生参与结构工程研究，并通过宾夕法尼亚州立大学工程多样性办公室的夏季研究计划（SROP）项目攻读土木工程研究生教育。