Seismic response of a mid-story isolated structure considering SSI in mountainous areas under long-period earthquakes

IF 2.6 2区工程技术 Q2 ENGINEERING, CIVIL Earthquake Engineering and Engineering Vibration Pub Date : 2024-01-01 DOI:10.1007/s11803-024-2231-2

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Abstract

At present, there is not much research on mid-story isolated structures in mountainous areas. In this study, a model of a mid-story isolated structure considering soil-structure interaction (SSI) in mountainous areas is established along with a model that does not consider SSI. Eight long-period earthquake waves and two ordinary earthquake waves are selected as inputs for the dynamic time history analysis of the structure. The results show that the seismic response of a mid-story isolated structure considering SSI in mountainous areas can be amplified when compared with a structure that does not consider SSI. The structure response under long-period earthquakes is larger than that of ordinary earthquakes. The structure response under far-field harmonic-like earthquakes is larger than that of near-fault pulse-type earthquakes. The structure response under near-fault pulse-type earthquakes is larger than that of far-field non-harmonic earthquakes. When subjected to long-period earthquakes, the displacement of the isolated bearings exceeded the limit value, which led to instability and overturning of the structure. The structure with dampers in the isolated story could adequately control the nonlinear response of the structure, effectively reduce the displacement of the isolated bearings, and provide a convenient, efficient and economic method not only for new construction but also to retrofit existing structures.

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长周期地震下山区考虑 SSI 的中层孤立结构的地震响应

摘要目前，关于山区中层隔震结构的研究不多。本研究建立了一个考虑山区土-结构相互作用（SSI）的中层隔震结构模型，以及一个不考虑 SSI 的模型。选取 8 个长周期地震波和 2 个普通地震波作为结构动态时间历程分析的输入。结果表明，与不考虑 SSI 的结构相比，考虑了 SSI 的山区中层孤立结构的地震响应会被放大。长周期地震下的结构响应大于普通地震下的结构响应。远场谐波地震下的结构响应大于近断层脉冲地震下的结构响应。近断层脉冲型地震下的结构响应大于远场非谐波地震下的结构响应。在长周期地震作用下，隔震支座的位移超过了极限值，导致结构失稳和倾覆。在隔震层中设置阻尼器的结构可以充分控制结构的非线性响应，有效减小隔震支座的位移，不仅为新建工程，也为现有结构的改造提供了一种便捷、高效、经济的方法。

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来源期刊

Earthquake Engineering and Engineering Vibration 工程技术-工程：地质

CiteScore

4.70

自引率

21.40%

发文量

1057

审稿时长

9 months

期刊介绍： Earthquake Engineering and Engineering Vibration is an international journal sponsored by the Institute of Engineering Mechanics (IEM), China Earthquake Administration in cooperation with the Multidisciplinary Center for Earthquake Engineering Research (MCEER), and State University of New York at Buffalo. It promotes scientific exchange between Chinese and foreign scientists and engineers, to improve the theory and practice of earthquake hazards mitigation, preparedness, and recovery. The journal focuses on earthquake engineering in all aspects, including seismology, tsunamis, ground motion characteristics, soil and foundation dynamics, wave propagation, probabilistic and deterministic methods of dynamic analysis, behavior of structures, and methods for earthquake resistant design and retrofit of structures that are germane to practicing engineers. It includes seismic code requirements, as well as supplemental energy dissipation, base isolation, and structural control.