RII Track-4: Quantifying Seismic Resilience of Multi-Functional Floor Isolation Systems through Cyber-Physical Testing

地震事件对建筑物及其内容造成的损害可能会影响生命安全，并在地震后中断业务运营。通过隔振减少建筑物的地震力，可以最大限度地减少甚至消除由此造成的社会和经济损失。特别是地板隔震系统（菲斯），是一种很有前途的改造策略，可以保护重要的建筑物内容，提高社区的抗震能力。该项目将利用利哈伊大学最先进的NSF资助的自然灾害工程研究基础设施（NHERI）实验设施，为菲斯建立一个实验测试平台和测试协议。通过在扩展研究访问期间进行的测试，PI和一名研究生将评估菲斯的性能，并促进对其基础物理的理解，同时还将在Lehigh接受称为实时混合仿真的独特网络物理测试能力的实践培训。通过这些访问学到的新技术和知识将通过在现有设施上集成实时混合测试来改变PI在俄克拉荷马州大学进行研究的方式。这将对PI所在机构的本科生和研究生以及研究人员的培训产生持久的影响。一个社区对地震灾害的复原力是由其吸收极端事件并在事件发生后保持可接受的功能水平的能力来定义的。为了帮助确保一个更有弹性的社区和更安全的环境，拟议的研究将严格评估PI实验室开发的多功能菲斯的设计方法，该方法将建筑FIS相互作用结合起来。这将通过利用基于网络物理系统的方法来实现，即实时混合模拟，利用利哈伊大学最先进的设施。这些测试的总体目标是：（a）将实时混合仿真算法扩展到隔震系统;（B）通过实验验证弹性菲斯的基于物理的数学模型;（c）促进对这些系统的基本非线性动力学的理解;以及（d）量化这些系统的性能，包括多尺度（建筑物-FIS）相互作用。在延长的研究访问期间进行的网络物理测试将有助于澄清弹性隔离系统的基本局限性，并量化其在弹性目标方面可实现的性能。这些测试构成了有史以来第一次实时混合模拟FIS，特别是，和多轴混合测试的地震隔离装置，一般。这项研究有可能降低震后恢复的维修和拆除成本，包括对非结构元件/内容的损坏，拯救生命，并为关键设施提供即时操作。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

Damage caused by seismic events to buildings and their contents can impact life safety and disrupt business operations following an earthquake. The resulting social and economic losses can be minimized, or even eliminated, by reducing the seismic forces on building contents through vibration isolation. Floor isolation systems (FISs), in particular, are a promising retrofit strategy for protecting vital building contents and enhancing a community's seismic resilience. This project will establish an experimental testbed and test protocol for FISs, utilizing the state-of-the-art NSF-funded Natural Hazards Engineering Research Infrastructure (NHERI) Experimental Facility at Lehigh University. Through the tests conducted during extended research visits, the PI and a graduate student will assess the performance of FISs and advance the understanding of their underlying physics, while also receiving hands-on training on the unique cyber-physical testing capabilities at Lehigh called real-time hybrid simulation. The new techniques and knowledge learned through these visits will transform the way the PI conducts research at the University of Oklahoma through the integration of real-time hybrid testing on existing facilities. This will have a lasting impact on the training of undergraduate and graduate students and researchers at the PI's home institution. A community's resilience to seismic hazards is defined by its ability to absorb an extreme event and maintain an acceptable level of functionality following the event. To help ensure a more resilient community and a safer environment, the proposed research will rigorously evaluate a design methodology developed in the PI's lab for multi-functional FISs incorporating building-FIS interactions. This will be achieved by utilizing a cyber-physical systems based approach, namely real-time hybrid simulation, leveraging the state-of-the-art facilities at Lehigh University. The overall aim of these tests is to: (a) extend real-time hybrid simulation algorithms to seismic isolation systems; (b) experimentally validate physics-based mathematical models for resilient FISs; (c) advance the understanding of the underlying nonlinear dynamics of these systems; and (d) quantify the performance of these systems incorporating multi-scale (building-FIS) interactions. The cyber-physical tests conducted during the extended research visits will help to clarify the fundamental limitations of resilient isolation systems and quantify their achievable performance with respect to resilience goals. These tests constitute the first ever real-time hybrid simulation of FISs, in particular, and multi-axial hybrid testing of seismic isolation devices, in general. This research has the potential to lower the repair and demolition costs of post-earthquake recovery, including damage to non-structural elements/contents, save lives, and provide immediate operation for critical facilities.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.