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Seismic Response Control Of Structures Using Semi-Active and Passive Variable Stiffness Devices.

机译：使用半主动和被动可变刚度装置的结构地震响应控制。

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摘要

Controllable devices such as Magneto-Rheological Fluid Dampers, Electro-Rheological Dampers, and controllable friction devices have been studied extensively with limited implementation in real structures. Such devices have shown great potential in reducing seismic demands, either as smart base isolation systems, or as smart devices for multistory structures. Although variable stiffness devices can be used for seismic control of structures, the vast majority of research effort has been given to the control of damping.;The primary focus of this dissertation is to evaluate the seismic control of structures using semi-active and passive variable stiffness characteristics. Smart base isolation systems employing variable stiffness devices have been studied, and two semi-active control strategies are proposed. The control algorithms were designed to reduce the superstructure and base accelerations of seismically isolated structures subject to near-fault and far-field ground motions. Computational simulations of the proposed control algorithms on the benchmark structure have shown that excessive base displacements associated with the near-fault ground motions may be better mitigated with the use of variable stiffness devices. However, the device properties must be controllable to produce a wide range of stiffness changes for an effective control of the base displacements. The potential of controllable stiffness devices in limiting the base displacement due to near-fault excitation without compromising the performance of conventionally isolated structures, is illustrated.;The application of passive variable stiffness devices for seismic response mitigation of multistory structures is also investigated. A stiffening bracing system (SBS) is proposed to replace the conventional bracing systems of braced frames. An optimization process for the SBS parameters has been developed. The main objective of the design process is to maintain a uniform inter-story drift angle over the building's height, which in turn would evenly distribute the seismic demand over the building. This behavior is particularly essential so that any possible damage is not concentrated in a single story. Furthermore, the proposed design ensures that additional damping devices distributed over the building's height work efficiently with their maximum design capacity, leading to a cost efficient design. An integrated and comprehensive design procedure that can be readily adopted by the current seismic design codes is proposed. An equivalent lateral force distribution is developed that shows a good agreement with the response history analyses in terms of seismic performance and demand prediction. This lateral force pattern explicitly accounts for the higher mode effect, the dynamic characteristics of the structure, the supplemental damping, and the site specific seismic hazard. Therefore, the proposed design procedure is considered as a standalone method for the design of SBS equipped buildings.
机译：诸如磁流变流体阻尼器，电流变阻尼器和可控摩擦装置等可控设备已经在实际结构中进行了广泛的研究，但实施受到限制。这种设备作为智能基础隔离系统或多层结构的智能设备，在减少地震需求方面显示出巨大潜力。尽管变刚度装置可以用于结构的地震控制，但是对阻尼的控制已经进行了大量的研究。本论文的主要重点是利用半主动和被动变量评估结构的地震控制。刚度特性。研究了采用可变刚度装置的智能基础隔离系统，并提出了两种半主动控制策略。设计控制算法的目的是减少受近断层和远场地面运动影响的地震隔离结构的上部结构和基础加速度。在基准结构上对所提出的控制算法进行的计算仿真表明，通过使用可变刚度装置，可以更好地缓解与近断层地面运动相关的过度基础位移。但是，设备的属性必须是可控制的，以产生大范围的刚度变化，以有效控制基本位移。说明了可控刚度装置在限制近断层激励引起的基础位移而不破坏传统隔震结构性能方面的潜力。；还研究了被动变刚度装置在多层结构减震中的应用。提出了一种加强支撑系统（SBS）来代替传统的支撑框架支撑系统。已经开发了SBS参数的优化过程。设计过程的主要目的是在建筑物的整个高度上保持均匀的层间漂移角，从而将地震需求均匀地分布在建筑物上。此行为特别重要，这样任何可能的损坏都不会集中在一个故事中。此外，建议的设计可确保在建筑物的整个高度上分布的附加阻尼装置以其最大的设计能力有效地工作，从而实现具有成本效益的设计。提出了一种可以被当前的抗震设计规范轻易采用的综合而全面的设计程序。开发了等效的横向力分布，在地震性能和需求预测方面与响应历史分析显示出良好的一致性。这种横向力模式明确地说明了较高的模态效应，结构的动力特性，附加阻尼以及特定地点的地震危险。因此，所提出的设计程序被认为是设计带有SBS的建筑物的独立方法。

著录项

  • 作者

    Salem, Mohamed M. A.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Engineering Civil.;Engineering Geophysical.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 273 p.
  • 总页数 273
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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