Development and Implementation of Effective Force Testing: A Method of Seismic Simulation

有效力测试的开发和实施：地震模拟方法

• 批准号: 9821076
• 负责人: Catherine French
• 金额: $ 32.17万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2003-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9821076&HistoricalAwards=false
• 关键词: Development; Implementation; Effective; Force; Testing

The objective of this research project is to develop and implement a test method, "Effective Force Testing" (EFT), which enables real-time testing of large-scale structural systems subjected to earthquake loadings. This method has at least two desirable characteristics. First, it permits economical real-time dynamic testing of large-scale structural systems, which is important for structural details affected by strain rate effects. Second, it provides a means of testing the robustness and reliability of active, semi-active, and passive control systems on large-scale structures.The EFT method provides capabilities which complement those of the other three primary types of earthquake simulation test methods: shake table, quasi-static, and pseudodynamic. Restrictions on the type of structures that can be tested are similar to those required by the pseudodynamic test method (i.e. lumped mass systems fixed to the laboratory floor). However, rather than using a displacement control algorithm, as is the case for the pseudo-dynamic test method, EFT uses a force control algorithm. The EFT method can be used to conduct real-time earthquake simulation studies because the effective forces to be applied to the limped mass structure are known a priori. They are the product of the respective story masses and the ground acceleration record. Consequently, the effective forces are independent of structural response.A pilot study conducted on the EFT method on a linear elastic SDOF system was successful; but control problems associated with actuator/structure interaction were discovered. In this project, the investigation will be extended systems.The project will be accomplished in two phases. The first phase consists of experimental and numerical simulation studies to investigate potential control problems expected with increased servovalve flow demands associated with taking a test structure into the nonlinear range of behavior. A source of control problems may be associated with servovalve/actuator nonlinearities not currently accounted for in the linear models used by the investigators. To detect these problems, tests will be conducted on a simple test structure designed to repeatably exhibit nonlinear behavior. The second phase of the research will consist of a proof-of-concept test on a replicate structure, which has been tested previously on an earthquake simulator to compare the results of the two earthquake simulation techniques.An integrated interdisciplinary approach will be used throughout the project, which combines structural testing and analysis expertise from the Department of Civil Engineering faculty, and controls expertise from the Department of Aerospace and Mechanics faculty. Japanese collaborators on the project at University of Tokyo will focus on developing a real-time "on-line" testing method, similar to pseudo-dynamic testing, including substructuring.This project is supported under NSF 98-36, "US-Japan Cooperative Research on Urban Earthquake Disaster Mitigation."

本研究项目的目标是开发和实施一种测试方法，“有效力测试”（EFT），它可以实时测试受到地震荷载的大型结构系统。 这种方法至少有两个可取的特点。 首先，它允许经济的实时动态测试的大型结构系统，这是重要的结构细节受应变率效应。 其次，它提供了一种测试大型结构主动、半主动和被动控制系统鲁棒性和可靠性的方法。EFT方法提供了对其他三种主要地震模拟试验方法（振动台、准静态和伪动态）的补充能力。 对可进行试验的结构类型的限制类似于拟动力试验方法所要求的限制（即固定在实验室地板上的集中质量系统）。 然而，EFT不是使用位移控制算法，而是使用力控制算法，如伪动态测试方法的情况。 EFT方法可用于进行实时地震模拟研究，因为要施加到跛脚质量结构的有效力是已知的先验。 它们是各自楼层质量和地面加速度记录的乘积。 因此，有效力与结构响应无关。在线弹性单自由度系统上成功地进行了EFT方法的初步研究，但发现了与作动器/结构相互作用相关的控制问题。 在本项目中，调查将扩展系统。该项目将分两个阶段完成。 第一阶段包括实验和数值模拟研究，以调查潜在的控制问题，预计增加伺服阀流量的需求与采取测试结构的非线性范围内的行为。 控制问题的一个来源可能与伺服阀/执行器的非线性不占目前的线性模型所使用的调查。 为了检测这些问题，将在一个简单的测试结构上进行测试，该结构设计成可重复地表现出非线性行为。 研究的第二阶段将包括对一个复制结构进行概念验证测试，该结构之前已经在地震模拟器上进行了测试，以比较两种地震模拟技术的结果。整个项目将采用综合的跨学科方法，结合土木工程系的结构测试和分析专业知识，并控制航空航天和机械系的专业知识。 东京大学的日本合作者将致力于开发一种类似于伪动力测试的实时“在线”测试方法，包括子结构。该项目得到了NSF 98-36“美日城市地震灾害减轻合作研究“的资助。"