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

PI：罗伯特·克里斯滕森，科罗拉多矿业学院这项研究的目标是通过对非线性结构的半主动控制进行创新的全尺寸实验验证，调查和推进由自然和人为危害引起的结构损伤的缓解。这项研究将利用位于博尔德科罗拉多大学的George E. Brown, Jr.地震工程模拟网络（NEES）共享快速混合测试系统。智力优势：新开发的半主动技术在保护土木结构方面显示出希望。半主动控制提供了额外的阻尼，以更有效地消散由于动态载荷的能量，提高了结构的安全性和性能。半主动阻尼通常是为线性结构设计和应用的。然而，土木结构通常被设计为屈服，因此在极端动力荷载下表现为非线性。半主动装置固有的稳定性使该技术可以应用于结构，无论是否增加控制，在恶劣条件下都可能遭受损坏。半有源器件的低功耗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备用电源继续完全工作。尽管有这些优点，存在非线性结构行为的半主动控制受到的关注有限，并且尚未得到实验证明。本提案的目标是调查和促进减轻自然和人为灾害造成的结构破坏。提出了创新研究，以进一步提高半主动技术的认识状态和接受程度。这是通过实验研究验证了在大地震事件中表现出非线性行为的建筑物的半主动控制策略来实现的。该研究将利用位于博尔德的科罗拉多大学的NEES共享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180千牛磁流变液阻尼器的混合测试，同时实时模拟建筑结构在模拟和记录地震下的非线性响应。更广泛的影响：从最近的灾害中可以看出，结构性能对社会的安全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，以提高国家开展地震工程研究的能力。环境监测系统的设施将于2004年10月投入运作。拟议的研究可能对土木结构的半主动控制和减灾的进展产生重大影响。这项研究的成功完成将导致涉及物理建筑模型和实际结构的进一步研究。提议使用科罗拉多大学博尔德分校的NEES共用场地，将为PI提供有效且经济有效地对非线性建筑结构进行半主动控制的全面实验验证的手段。全尺寸半主动结构控制实验将在项目结束时提供给感兴趣的研究人员一段时间。这将影响其他研究人员的半主动控制策略的实验验证，从而推进土木结构半主动控制的整体研究状态。

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.