CAREER: Mitigation of Seismic Risk to Critical Building Contents via Optimum Nonlinear 3D Isolation

职业：通过最佳非线性 3D 隔离减轻关键建筑内容的地震风险

• 批准号: 1943917
• 负责人: Philip Harvey
• 金额: $ 50万
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1943917&HistoricalAwards=false
• 关键词: CAREER; Mitigation; Seismic; Risk; Critical

This Faculty Early Career Development (CAREER) grant will advance the design, analysis, and implementation of seismic isolation solutions for buildings, overcoming existing limitations to ensure post-earthquake functionality of mission-critical equipment in essential facilities. Essential facilities, such as emergency response centers and hospitals, must remain operational during and after an earthquake for the public welfare and safety. Seismic isolation systems, such as rolling isolation platforms, are a viable means of protecting individual components or groups of equipment within such facilities. These systems, however, presently suffer from limited displacement capacity and no protection from vertical excitations, diminishing their performance under strong tri-directional earthquake-induced floor motions. This research project will develop a multi-objective, risk-informed framework to optimize 3D isolation systems, advance the mathematical modeling of passive 3D isolation systems designed using the framework, and experimentally verify the predicted performance under tri-directional seismic loading. This new knowledge, coupled with improved design tools, will allow practicing engineers to better understand the behavior of these systems and to pursue innovative strategies to mitigate damage to vital equipment, thus reducing the vulnerability of the nation's essential facilities. The research plan will be woven into educational activities aimed at promoting diversity in engineering and creating hands-on educational opportunities for K-12, undergraduate, and graduate students through a low-cost, educational shake table module. Project data will be archived and made publicly available in the Natural Hazards Engineering Research Infrastructure Data Depot (https://www.DesignSafe-ci.org). This project contributes to the National Science Foundation role the National Earthquake Hazards Reduction Program. The overarching objective of this research is to advance 3D seismic isolation strategies through a deeper understanding of their underlying physics and to optimize, evaluate, and validate their performance. This research will answer fundamental questions related to (a) how the uninterrupted operation of essential facilities and their contents can be reliably ensured under tri-directional earthquake excitations of various intensities from frequent to rare events, and (b) how the performance capacity inherent to equipment isolation systems can be augmented with innovative materials and optimization approaches. The specific tasks of the project are aimed at: (1) characterizing 3D seismic hazards to critical building contents and defining risk-based performance objectives for these components; (2) discovering and realizing optimum nonlinear restoring and damping forces for passive 3D isolation systems composed of rolling pendulum bearings and quasi-zero stiffness isolators that exhibit response-based adaptation; (3) experimentally validating physics-based mathematical models of these protective systems for use in design to capture the complex behavior that occurs under seismic loading; and (4) establishing a design framework to facilitate the direct transfer of this concept to engineering practice.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项教师的早期职业发展（职业）赠款将推动建筑物的地震隔离解决方案的设计，分析和实施，克服现有的限制，以确保基本设施中关键任务设备的地震后功能。紧急响应中心和医院等基本设施必须在公共福利和安全地震期间和之后仍在运营。地震隔离系统（例如滚动隔离平台）是保护此类设施中各个组件或设备组的可行手段。但是，这些系统目前遭受了有限的位移能力，并且没有防止垂直激发的保护，从而在强烈的三方向地震引起的地板运动下降低了其性能。该研究项目将开发一个多目标，风险知识的框架，以优化3D隔离系统，推进使用框架设计的被动3D隔离系统的数学建模，并实验验证在三方向地震载荷下的预测性能。这种新知识再加上改进的设计工具，将使执业工程师能够更好地了解这些系统的行为，并采取创新策略来减轻对重要设备的损害，从而减少国家基本设施的脆弱性。该研究计划将编织成教育活动，旨在通过低成本，教育性的摇桌模块为K-12，本科生和研究生创造动手的教育机会。 项目数据将在自然危害工程研究基础设施数据台（https://www.designsignsafe-ci.org）中进行存档并公开提供。 该项目为国家科学基金会的角色做出了贡献，即国家地震危害计划。 这项研究的总体目的是通过更深入地了解其潜在物理学并优化，评估和验证其性能，以推进3D地震隔离策略。这项研究将回答与（a）有关基本设施及其内容的不间断操作有关的基本问题，可以在三方向地震激励下可靠地确保各种强度从频繁到罕见事件的各种强度以及（b）如何通过创新的材料和优化的设备隔离系统来增强设备隔离系统的固有性能能力。该项目的特定任务的目的是：（1）表征对关键建筑物内容的3D地震危害，并为这些组件定义基于风险的绩效目标； （2）发现和实现由滚动摆轴承和准零刚度隔离器组成的被动3D隔离系统的最佳非线性恢复和阻尼力，这些隔离器表现出基于响应的适应性； （3）实验验证这些保护系统的基于物理学的数学模型，以捕获在地震载荷下发生的复杂行为； （4）建立一个设计框架，以促进该概念直接转移到工程实践中。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的评估标准通过评估来支持的。

项目成果

Structural Dynamics Through the Lens of 3-D Printing

3D 打印视角下的结构动力学

• DOI: 10.17603/ds2-d689-jr55
• 发表时间: 2022
• 期刊: Designsafe-CI
• 作者: Mundt, Amanda;Vanderheiden, Erika;Harvey, Philip
• 通讯作者: Harvey, Philip

Inextensibility and Its Effect on the Number of Equilibria of Shallow Buckled Beams

• DOI: 10.1115/1.4048199
• 发表时间: 2020-12
• 期刊: Journal of Applied Mechanics
• 作者: P. S. Harvey;R. Wiebe;T. Cain

A dual-mode floor isolation system to achieve vibration isolation and absorption: Experiments and theory

• DOI: 10.1016/j.jsv.2022.116757
• 发表时间: 2022-01-29
• 期刊: JOURNAL OF SOUND AND VIBRATION
• 影响因子: 4.7
• 作者: Bin, P.;Harvey, P. S., Jr.
• 通讯作者: Harvey, P. S., Jr.

Exploration of Dynamics through 3-D Printed Designs

通过 3D 打印设计探索动力学

• DOI: 10.17603/ds2-2k0d-3e48
• 发表时间: 2022
• 期刊: Designsafe-CI
• 作者: Griffin, Mia;Vanderheiden, Erika;Harvey, Philip
• 通讯作者: Harvey, Philip

A lateral–torsional buckling demonstration model using 3D printing

使用 3D 打印的横向扭转屈曲演示模型

• DOI: 10.1016/j.engstruct.2023.115682
• 发表时间: 2023
• 期刊: Engineering Structures
• 影响因子: 5.5
• 作者: Virgin, L.N.;Harvey, P.S.
• 通讯作者: Harvey, P.S.