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首页> 外文期刊>Journal of Earthquake Engineering >ROBUST HYBRID ISOLATION SYSTEM FOR A SEISMICALLY EXCITED CABLE-STAYED BRIDGE
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ROBUST HYBRID ISOLATION SYSTEM FOR A SEISMICALLY EXCITED CABLE-STAYED BRIDGE

机译：地震激励的索桥的鲁棒混合隔离系统

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This paper presents a robust hybrid isolation system for seismic response control of a cable-stayed bridge. Because multiple control devices are operating, a hybrid control system could alleviate some of the restrictions and limitations that exist when each control system, such as passive, active, semiactive control system, is acting alone. However, the overall system robustness may be negatively impacted by active control part of the hybrid system or active controller may cause instability due to small margins. Therefore, control algorithms that guarantee the controller robustness should be considered to improve the overall system robustness of the hybrid seismic isolation system and to enhance the possibility of real applications of the system consequently. In this study, a hybrid isolation system combining lead rubber bearings and hydraulic actuators is used for seismic response control of a cable-stayed bridge. Lead rubber bearings are used as passive control devices to reduce the earthquake-induced forces in the bridge and hydraulic actuators are used as active control devices to further reduce the bridge responses, especially deck displacements. Furthermore, two kinds of robust control algorithms, i.e., the H_2 and H_∞ control designs with frequency weighting filters, are used to improve the controller robustness of the overall system. The numerical simulation results show that the proposed hybrid seismic isolation systems have the excellent robustness for stiffness perturbations without loss of control performances under the considered earthquakes in this study. Therefore, the proposed robust hybrid isolation systems could effectively be used to seismically excited cable-stayed bridges.
机译：本文提出了一种用于斜拉桥地震响应控制的鲁棒混合隔离系统。由于多个控制设备都在运行，因此混合控制系统可以减轻某些控制和限制，例如每个控制系统（例如被动，主动，半主动控制系统）单独运行时。但是，整个系统的鲁棒性可能会受到混合动力系统的主动控制部分的不利影响，或者主动控制器可能会由于较小的裕度而导致不稳定。因此，应考虑保证控制器鲁棒性的控制算法，以提高混合隔震系统的整体系统鲁棒性，从而提高系统实际应用的可能性。在这项研究中，将铅橡胶轴承和液压执行器组合在一起的混合隔离系统用于斜拉桥的地震响应控制。铅橡胶轴承用作被动控制装置，以减少桥梁中的地震作用力，液压致动器用作主动控制装置，以进一步减少桥梁的响应，尤其是桥面位移。此外，两种鲁棒控制算法，即具有频率加权滤波器的H_2和H_∞控制设计，被用于提高整个系统的控制器鲁棒性。数值模拟结果表明，在考虑地震的情况下，所提出的混合式隔震系统具有很好的鲁棒性，对刚度摄动没有损失控制性能。因此，所提出的鲁棒混合隔离系统可以有效地用于地震激励的斜拉桥。

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