NEES Experimental Project for Verifying Full-Scale Semiactive Control of Nonlinear Structures

主要研究者：罗伯特·克里斯滕森，科罗拉多矿业学院本研究的目的是调查和推进减轻结构损坏，由于自然和人为的危害，通过创新的全尺寸实验验证半主动控制应用于表现出非线性行为的结构。该研究将利用乔治E.小布朗博尔德市科罗拉多大学的地震工程模拟网络（NEES）共用快速混合测试系统。智力优点：新开发的半主动技术在保护土木结构方面显示出希望。半主动控制提供了补充阻尼，以更有效地耗散由于动态载荷引起的能量，并提高了结构的安全性和性能。半主动阻尼通常被设计并应用于线性结构。然而，土木结构通常被设计为屈服，因此在极端动态载荷期间表现为非线性。半主动装置的固有稳定性允许将该技术应用于结构，无论增加的控制如何，该结构在恶劣条件下可能会受到损坏。半有源器件的低功率要求确保在外部电源不可用的重大事件期间，半有源器件可以使用替代电源继续完全工作。尽管有这些优点，在非线性结构行为的存在下，半主动控制受到了有限的关注，并尚未被证明experimental.The本建议的目标是调查和推进由于自然和人为灾害的结构损伤的缓解。创新研究的建议，以进一步推进国家的知识和接受的半主动技术。这是通过实验研究验证半主动控制策略的建筑物表现出非线性行为在大地震事件。该研究将利用位于博尔德的科罗拉多大学的NEES共享使用快速混合测试系统进行全面的实验验证。该实验将采用半主动180 kN磁流变液（MR）阻尼器的混合测试，同时实时模拟建筑结构在模拟和记录地震的套件下的非线性响应。更广泛的影响：正如在最近的灾难中所观察到的那样，结构性能对社会的安全性和经济可行性至关重要。1999年，美国国家科学基金会（NSF）启动了NEES，以改变国家进行地震工程研究的能力。NEES设施将于2004年10月投入使用。该研究对土木结构半主动控制和减灾的发展具有重要意义。这项研究的成功完成将导致进一步的研究，涉及物理建筑模型和实际结构。拟议使用的NEES共享使用网站在科罗拉多大学博尔德分校的科罗拉多将提供PI的手段，有效地和成本有效地进行全面的实验验证非线性建筑结构的半主动控制。在项目结束时，将向感兴趣的研究人员提供一段时间的全尺寸半主动结构控制实验。这将影响其他研究人员的半主动控制策略可以通过实验验证的容易程度，从而推进土木结构半主动控制研究的整体状态。

PI: Robert Christenson, Colorado School of Mines The objective of this proposed research is to investigate and advance the mitigation of structural damage due to natural and man-made hazards through the innovative full-scale experimental verification of semiactive control applied to structures exhibiting nonlinear behavior. The research will make use of the George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) shared-use Fast Hybrid Test system at the University of Colorado at Boulder.Intellectual Merit: Newly developed semiactive technology shows promise in protecting civil structures. Semiactive control provides supplemental damping to more efficiently dissipate the energy due to dynamic loads and increases the safety and performance of the structure. Semiactive damping has typically been designed for and applied to linear structures. Civil structures, however, are typically designed to yield, thus behaving nonlinearly during extreme dynamic loading. The inherent stability of a semiactive device allows this technology to be applied to structures which, regardless of the added control, may experience damage during severe conditions. The low power requirements of semiactive devices ensure that during a major event when external power may not be available the semiactive device can continue to fully function using an alternate power source. Despite these advantages, semiactive control in the presence of nonlinear structural behavior has received limited attention and has yet to be demonstrated experimentally.The objectives of this proposal are to investigate and advance the mitigation of structural damage due to natural and man-made hazards. Innovative research is proposed to further advance the state of knowledge and acceptance of semiactive technology. This is accomplished through experimental research verifying semiactive control strategies for buildings exhibiting nonlinear behavior during large seismic events. The research will utilize the NEES shared-use Fast Hybrid Test system at the University of Colorado at Boulder to perform full-scale experimental verification. The experiment will employ hybrid testing of a semiactive 180 kN magnetorheological fluid (MR) damper while simulating in real-time the nonlinear response of a building structure subjected to suites of simulated and recorded earthquakes.Broader Impacts: Structural performance is critical to the safety and economic viability of society as observed in recent disasters. In 1999, the National Science Foundation (NSF) launched NEES to transform the nation's ability to carry out earthquake engineering research. The NEES facilities will be operational in October 2004. The proposed research can potentially have a significant impact on the advancement of semiactive control and hazard mitigation for civil structures. Successful completion of this research will lead to further studies involving physical building models and actual structures. The proposed use of the NEES shared-use site at the University of Colorado at Boulder will provide the PI with the means to efficiently and cost-effectively perform full-scale experimental verification of semiactive control for nonlinear building structures. The full-scale semiactive structural control experiment will be made available to interested researchers for a period of time at the end of the project. This will impact the ease at which additional researchers' semiactive control strategies can be experimentally verified, thus advancing the overall state of research in semiactive control for civil structures.