BRIGE: Reliability Assessment of Real-Time Hybrid Simulation Results for Performance Evaluation of Structures under Earthquakes

这一扩大参与的研究启动赠款(CLIEW)项目开发了一种新的方法，使用实时混合模拟技术来评估实验结果的可靠性，以复制地震期间的实际结构响应。实时混合仿真被广泛认为是研究结构速率相关行为的最先进工具。然而，在研究大型结构在地震作用下的行为时，由于伺服液压执行器延迟引起的跟踪误差在实验室中积累和传播，严重限制了其应用。基于以前对执行器延迟累积效应的研究，该项目将确定结构非线性、子结构分区以及地面运动输入和强度变化的影响。数据分析将使用延迟微分方程的数值模拟和执行器延迟与模拟精度之间的相关性分析。该项目将导致开发一个基于概率的能量误差和跟踪指标，使工程界能够评估实验结果的可靠性并验证这些结果，特别是在无法立即比较地震下的实际结构反应的情况下。这项研究将通过解决目前限制实时混合模拟技术应用的问题，填补地震工程界的一个重大知识空白。它将产生一个高效和有效的评估工具，使实时混合仿真技术能够在实验室中充分应用其潜力。该项目将有助于建立国际合作，并加强旧金山州立大学工程学院的研究基础设施。旧金山州立大学是美国种族和文化最多元化的大学之一？S。它将与最近在旧金山州立大学获得的NSF-MRI赠款获得的伺服液压设备相结合，并将使本科生和研究生研究人员参与当前地震工程研究的各个方面。该项目还将接触到卡尼亚达学院的学生，这是一家主要的拉美裔服务机构，以扩大现有NASA CiPair和美国能源部CalSTEP项目的影响，并为这些学生提供无与伦比的地震工程研究机会。

This Broadening Participation Research Initiation Grant (BRIDGE) project develops a novel approach to assessing the reliability of experimental results using the real-time hybrid simulation technique for replicating actual structural responses during earthquakes. Real-time hybrid simulation is widely viewed as the most advanced tool for investigating the rate-dependent behaviors of structures. However, its application has been severely limited by the servo-hydraulic actuator delay induced tracking errors which accumulate and propagate in laboratory to study the behavior of large-scale structures under earthquakes. Building on previous research into the cumulative effect of actuator delay, this project will determine the effects of structural nonlinearity, substructure partitions, and variations in ground motion inputs and intensities. Data will be analyzed using numerical simulation of delay differential equations and correlation analysis between actuator delay and simulation accuracy. The project will result in the development of a probability-based energy error and tracking indicator which will enable the engineering community to assess the reliability of experimental results and to validate these results, especially when the actual structural responses under earthquakes are not available for an immediate comparison. The research will fill a significant knowledge gap in the earthquake engineering community by resolving a problem that currently limits the application of real-time hybrid simulation technique. It will lead to an efficient and effective assessment tool that will enable the real-time hybrid simulation technique to be applied in the laboratory to its full potential. The project will help to build international collaborations and enhance the research infrastructure at the School of Engineering at San Francisco State University, one of the nation?s most ethnically and culturally diverse universities. It will be integrated with the servo-hydraulic equipment acquired through a recent NSF-MRI grant at SFSU and will engage undergraduate and graduate researchers in current aspects of earthquake engineering research. The project will also reach out to students from Cañada College, a premier Hispanic-serving institution, to extend the impact of existing NASA CiPair and DoE CalSTEP programs and provide these students with unparalleled opportunities in earthquake engineering research.