US-Tunisia Cooperative Research: Vibration Confinement in Seismically Excited Linear and Hysteretic Structures

描述：该奖项支持弗吉尼亚州布莱克斯堡弗吉尼亚理工学院和州立大学工程科学与机械系AliNayfeh教授与突尼斯突尼斯综合理工学院工程系Sami El-Borgi博士之间的合作研究项目。研究人员将研究通过被动限制振动来控制地震激发的线弹性或滞后结构。本研究的目标是：a)开发一种被动控制策略，该策略允许将振动能量从结构转移到添加的被动元件，如对角支撑元件，从而降低结构的振动幅值，并以减缓被动元件收敛到初始状态为代价，更快地将其降至所需的平衡状态；B)确保该策略对与结构的质量、阻尼和刚度相关的参数不确定性具有灵敏度和鲁棒性；c)在各种地震荷载下保持被动构件的振动约束。范围：保护建筑物免受有害地震和/或风的振动是一个世界性的问题。在土木工程应用中，利用被动元件约束振动来控制地震激励结构是一种新的设计方法。这个想法与各个领域相关，例如机械系统和多层建筑。Nayfeh博士一直活跃于动态系统的线性和非线性控制研究。他将与El-Borgi博士和另外两名突尼斯教员合作。El-Borgi博士在地震激励结构的非线性分析和控制以及大型土木工程结构的实验测试方面非常活跃。资金由国际科学与工程办公室和土木与机械系统司提供。

0138083 NayfehDescription: This award supports a cooperative research project between Professor AliNayfeh, Department of Engineering Sciences and Mechanics, Virginia Polytechnic Institute and State University (VA Tech.), Blacksburg, Virginia and Dr. Sami El-Borgi, Department of Engineering, Ecole Polytechnique de Tunisie (EPT), Tunis, Tunisia. The investigators will examine the control of a seismically excited linear elastic or hysteretic structure by passive confinement of vibrations. The objectives of the research are: a) to develop a passive control strategy which allows the transfer of the vibrational energy from the structure to added passive elements, such as diagonal bracing elements, resulting in reducing the vibration amplitudes of the structure and bringing it down to its desired equilibrium state more rapidly at the expense of slowing down the convergence of the passive elements to their initial state; b) to ensure the sensitivity robustness of such a strategy against parameter uncertainties related to the mass, damping, and stiffness of the structure; and c) to preserve the vibration confinement in the passive elements for various types of seismic loadings.Scope: The protection of structures from harmful earthquake and/or wind vibrations is a worldwide issue. The control of seismically excited structures by confinement of vibrations with the aid of passive elements is a novel design methodology in civil engineering applications. The idea is relevant to various fields, such as mechanical systems and multi-floor buildings. Dr. Nayfeh has been quite active in research on linear and nonlinear control of dynamical systems. He will collaborate with Dr. El-Borgi and two other Tunisian faculty members. Dr. El-Borgi has been quite active in nonlinear analysis and control of seismically excited structures and experimental testing of large civil engineering structures. Funding is provided by the Office of International Science and Engineering and the Division of Civil and Mechanical Systems.