Seismic base isolation faces the challenge of the large displacement demands for the isolators in case of long-period ground motions. Semi-active control has the potential to mitigate the risk against such extreme scenarios and therefore increase the seismic reliability of base-isolated structures. However, the superstructural nonlinearity and the time delay in the control system are always neglected in related studies. Such a knowledge gap may overestimate the benefit of semi-active control in enhancing the seismic reliability of base-isolated buildings. This study explores the seismic reliability of semi-actively base-isolated buildings with realistic considerations of the superstructural nonlinearity and the time delay in a practical hydraulic control system in a fully probabilistic framework. It features the use of the probability density evolution method (PDEM) and the development of a MATLAB-OpenSees interaction technique. The reliability of the semi-actively isolated structure and its passive counterpart are compared, highlighting the effects of nonlinearity and time delay. The results show the superstructural nonlinearity and the inevitable time delay in a practical hydraulic control system may significantly degrade the control performance of semi-actively base-isolated buildings, potentially leading to higher failure probabilities than passive buildings.

中文翻译：

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基于动态可靠性的液压阻尼器半主动地基隔震建筑物的抗震性能评估


抗震基础隔振面临着在长时间地震动的情况下对隔振器有较大位移要求的挑战。半主动控制有可能降低此类极端情况下的风险，从而提高基座隔振结构的抗震可靠性。然而，在相关研究中，控制系统中的上部结构非线性和时延总是被忽视。这种知识差距可能高估了半主动控制在提高地基隔离建筑物的抗震可靠性方面的好处。本研究探讨了半主动地基隔振建筑物的抗震可靠性，并在完全概率框架中实际考虑了实际水力控制系统中的上部结构非线性和时间延迟。它的特点是使用概率密度进化法 （PDEM） 并开发了 MATLAB-OpenSees 交互技术。比较了半主动隔离结构与其被动结构的可靠性，突出了非线性和时间延迟的影响。结果表明，实际水力控制系统中的上部结构非线性和不可避免的时间延迟可能会显著降低半主动地基隔离建筑的控制性能，可能导致比被动建筑更高的故障概率。