Risk-Based Design of Seismic Isolation for Critical Facilities

轻阻尼滚动隔离系统被用于保护关键任务设备免受冲击和振动危害。该项目将为包含被动可控阻尼处理的滚动隔震系统开发经过实验验证的模型和抗震鉴定指南。被动阻尼处理将使用弹性复合材料，并将使用实验和半分析方法相结合的方法进行建模和设计。可控摩擦阻尼将采用磁控摩擦阻尼，结合具有高摩擦系数的新型磁渗透聚合物，并将使用非线性最优控制方法进行评估。地震鉴定指南将以概率地震危险性分析方法为基础，并将以均匀危险性地震地面运动的详细统计模型为特色。该项目将解决有关位移能力、阻尼水平、阻尼机制以及与保护设备免受地震危害有关的响应控制等长期存在的问题。这些结果将使工程师能够设计和鉴定滚动隔离系统，以达到特定地理区域和一般安装环境所需的危害缓解水平。最终，这项研究将有助于减轻必须在大地震期间和之后运行的设施的地震危害，从而改善响应和恢复工作。在这个项目中开发的技术将通过发展工业联盟和培训当前和未来的专业人员转移到实践中。参与本研究的研究生将学习并应用动态和风险分析的先进方法。本科生和高中生将一起学习实验动力学和模型验证的方法。该项目将建立大量基于网络的实验室，通过这些实验室，任何水平的学生都可以通过物理和数值模拟来在线研究滚动隔离系统的行为。

Lightly-damped rolling isolation systems are being used to protect mission-critical equipment from shock and vibration hazards. This project will develop experimentally-validated models and seismic qualification guidelines for rolling isolation systems incorporating passive and controllable damping treatments. The passive damping treatments will use elastomeric composites and will be modeled and designed using a combination of experimental and semi-analytic methods. The controllable friction damping will feature magnetically-controlled friction damping incorporating novel magnetically-permeable polymers with high friction coefficients and will be assessed using methods of nonlinear optimal control. The seismic qualification guidelines will be based on methods of probabilistic seismic hazard analysis and will feature detailed statistical models of uniform-hazard earthquake ground motions. This project will resolve persistent issues regarding displacement capacity, damping levels, damping mechanisms, and response-control pertaining to the protection of equipment from earthquake hazards. These results will enable engineers to design and qualify rolling isolation systems to achieve a desired level of hazard mitigation for specific geographic regions and general installation environments. Ultimately, this research will contribute to the mitigation of seismic hazards for facilities that must operate during and after major earthquakes and will thereby improve response and recovery operations. Technology developed in this project will transfer to practice through the development of an industrial consortium and the training of current and future professionals. Graduate students involved in this research will learn and apply advanced methods in dynamics and risk analysis. Undergraduates and high school students will work together to learn methods of experimental dynamics and model validation. The project will undertake the creation of substantial web-based laboratories through which students of any level may investigate the behavior of rolling isolation systems on-line, through physical and numerical simulations.