Collaborative Research: An Innovative Gap Damper to Control Seismic Isolator Displacements in Extreme Earthquakes

合作研究：控制极端地震中隔震器位移的创新间隙阻尼器

• 批准号: 1101105
• 负责人: Keri Ryan
• 金额: $ 19.5万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 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: 2011-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1101105&HistoricalAwards=false
• 关键词: Collaborative; Research; Innovative; Gap; Damper

This research project will study the use of a special gap damper that is designed to limit the excessive deformation without causing impact and the associated high frequency motions and accelerations. In the design of a seismic base isolation system for a building, an isolator must be allowed to deform a significant amount. At the same time, this deformation must be controlled to avoid structural damage due to its reaching the displacement limit in a rare but possible strong ground motion. The project involves advanced analytical and numerical simulation studies to determine the optimal gap damper characteristics for desired performance such as the size of gap element, the ratio of pre- and post-gap isolation system stiffness, and the energy dissipation demand to reduce displacements without inducing large accelerations in the building. Experimental studies on a standalone damper will be conducted in the Structural Research Laboratory at Auburn University to characterize the energy dissipation properties of the damper. Shaking table studies at the Large Scale Structures Laboratory at the University of Nevada, Reno will validate the effectiveness of the proposed gap damper scheme. This study will provide an experimentally and analytically validated framework leading to reliable performance-based isolator design of buildings under different seismic scenarios.This research project is expected to lead to better designs of base isolation systems that are often used in critical or essential facilities such as hospitals, emergency operation centers, fire stations, and other important buildings. The research results will be broadly disseminated for practical implementation to practitioners through publication in technical journals, presentations in professional conferences and the website created for the project. The experimental data will be archived on the George E. Brown Network for Earthquake Engineering Simulation data repository for easy accessibility by other researchers in the earthquake engineering community. The project will provide advanced training to graduate and undergraduate students through their involvement in project research activities. To enhance the awareness and importance of earthquake engineering, a ?Reconnaissance Education Program" will be established with participation of several upper level undergraduate students with representation from underrepresented groups in an earthquake reconnaissance mission after the next major earthquake. This participation is expected to provide a life-changing experience for the students and to motivate them for long-term commitment to earthquake engineering.

该研究项目将研究特殊间隙阻尼器的使用，该阻尼器旨在限制过度变形而不引起冲击以及相关的高频运动和加速度。 在设计建筑物的地震底座隔离系统时，必须允许隔离器发生显着的变形。 同时，必须控制这种变形，以避免在罕见但可能发生的强烈地震动中由于其达到位移极限而导致结构损坏。 该项目涉及先进的分析和数值模拟研究，以确定所需性能的最佳间隙阻尼器特性，例如间隙元件的尺寸、间隙前后隔离系统刚度的比率，以及在不引起建筑物大加速度的情况下减少位移的能量耗散需求。奥本大学结构研究实验室将对独立阻尼器进行实验研究，以表征阻尼器的能量耗散特性。内华达大学里诺分校大型结构实验室的振动台研究将验证所提出的间隙阻尼器方案的有效性。这项研究将提供一个经过实验和分析验证的框架，从而在不同地震场景下对建筑物进行可靠的、基于性能的隔震器设计。该研究项目预计将有助于更好地设计基础隔震系统，这些系统通常用于关键或重要设施，如医院、紧急行动中心、消防站和其他重要建筑。研究结果将通过在技术期刊上发表、在专业会议上发表以及为该项目创建的网站来广泛传播，以便实际实施给从业者。实验数据将存档在乔治·E·布朗地震工程模拟网络数据存储库中，以便地震工程界的其他研究人员轻松访问。该项目将通过研究生和本科生参与项目研究活动为他们提供高级培训。为了提高人们对地震工程的认识和重要性，将设立一个“勘察教育计划”，由几名高年级本科生参与，其中代表性不足的群体代表下一次大地震后的地震勘察任务。这种参与预计将为学生提供改变生活的经历，并激励他们长期致力于地震工程。