Semiactive control of nonlinear and deteriorating structures

地震和其他极端事件产生的荷载会对民用基础设施造成严重破坏。例如，温哥华市设计水平地震的预计损失为30亿美元。配备有辅助设备的结构，称为智能结构，有可能显着减少损坏。然而，要从这些成果中受益，我们必须首先学习如何最好地应用这些设备并最大限度地提高其可靠性。 半主动控制由于其可靠性和低能量需求而成为提供结构控制的有吸引力的手段。半主动控制使用策略性地放置阻尼器，并使用控制算法来有效地调整它们。为了将这一新技术集成到新的和现有的结构中，关键是要开发可靠有效的算法，对结构特性中的非线性、不确定性和劣化具有鲁棒性，所有这些都经常发生在结构中。这种自适应半主动控制技术的发展是拟议的研究的主要目标。这一目标将通过理论分析，控制算法的发展，和计算机模拟，占，并解决，通常观察到的非线性和结构的不确定性。流行的半主动装置，如磁流变阻尼器和摩擦阻尼器将用于开发和执行适当的控制策略。申请人之前对基础隔震建筑控制的研究已经产生了几个复杂的模拟程序，这些程序将被扩展以实现本研究程序中寻求的新概念和算法。本项目寻求开发的技术和理解将代表新结构设计、改造现有结构、也是减少自然灾害对社会造成风险的重要一步。

Loads from earthquakes and other extreme events can cause serious damage to civil infrastructure. For example, the projected loss from a design level earthquake in the city of Vancouver is $3 billion. Structures equipped with supplemental devices, called smart structures, have the potential to significantly reduce damage. However, to benefit from the gains, we must first learn how best to apply these devices and maximize their reliability.     Semiactive control is an attractive means to provide structural control due to its reliability and low energy needs. Semiactive control uses strategically placed dampers, with control algorithms to adjust them effectively. In order to integrate this new technology in new and existing structures, it is critical to develop reliable and effective algorithms robust to nonlinearities, uncertainties in structural properties, and deterioration, all of which commonly occur in structures. The development of such adaptive semiactive control techniques is the main objective of the proposed research. This objective will be achieved by theoretical analyses, development of control algorithms, and computer simulations that account for, and address, commonly observed nonlinearities and uncertainties in structures. Popular semiactive devices, such as magnetorheological dampers and friction dampers will be used to develop and carry out the appropriate control strategies. The applicant's previous research on control of base isolated buildings has resulted in several sophisticated simulation programs that will be extended to implement the new concepts and algorithms sought in this research program.The techniques and understanding this project seeks to develop would represent a significant advance in the design of new structures, retrofitting existing structures, and an important step towards reducing the risk to the society due to natural hazards.