Near-Fault Ground Motion Influence on the Seismic Responses of a Structure with Viscous Dampers considering SSI Effect
Near-Fault Ground Motion Influence on the Seismic Responses of a Structure with Viscous Dampers considering SSI Effect
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DOI：
10.1155/2021/6649124
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发表时间：
2021-02
影响因子：
1.8
通讯作者：
Jinping Yang;Peizhen Li;Hang Jing;Meng Gao
中科院分区：
文献类型：
--
作者：
Jinping Yang;Peizhen Li;Hang Jing;Meng Gao
本文研究了近断层地震动特征对采用土-结构相互作用（SSI）等消能装置的结构地震响应的影响。介绍了软土地基上的十层钢筋混凝土框架，并设计了框架内加装的粘性阻尼器。通过ANSYS程序建立了带有粘滞阻尼器的土-结构体系的数值分析方法。此外，还对上盘效应、速度脉冲效应、前向性效应等近断层地震动主要特征的响应谱进行了仔细研究，了解其谱能量分布特征。然后，对带有和不带有粘性阻尼器的SSI系统进行选定的近断层地震动的动态时程分析。研究表明，在近断层地震动作用下，上盘效应结构的地震响应明显大于下盘效应，表明上盘效应对结构动力响应的影响明显。此外，与前向效应相比，粘滞阻尼器结构的性能更容易受到含有抛步效应的地震动的影响。而且，前向地震动水平分量对结构地震响应的影响比平行分量地震动更明显。因此，近断层地震动前向效应中的上盘效应、速度脉冲和水平分量对考虑SSI效应的消能装置结构的地震响应具有明显的影响，为考虑地震SSI效应的近断层建筑物基于性能的抗震设计提供了见解。
This paper studies the influence of the characteristics of the near-fault ground motion on the seismic responses of the structure with energy dissipation devices including soil-structure interaction (SSI). A ten-story reinforced concrete frame rested on soft site is introduced, and the viscous dampers added in the frame are designed. The numerical analysis method of the soil-structure system with viscous dampers is established through ANSYS program. In addition, the response spectra of the main characteristics of the near-fault ground motion, like hanging wall effect, velocity pulse-like effect, and forward-directivity effect, are investigated carefully to learn the features of spectra energy distribution. And then, the dynamic time-history analysis is performed on the SSI system with and without viscous dampers subjected to the selected near-fault ground motion. The study reveals that the seismic responses of the structure subjected to near-fault ground motion with hanging wall effect are obviously larger than those of the footwall effect, indicating the distinct hanging wall effects on the structural dynamic responses. In addition, the performance of the structure with viscous dampers is more influenced by the ground motion containing fling-step effect than that with forward-directivity effect. Moreover, the influence of the horizontal component of forward-directivity ground motion on the seismic responses of the structure is more obvious than that of parallel component ground motion. Consequently, the hanging wall effect, velocity pulse, and horizontal component in forward-directivity effect of the near-fault ground motion have distinct influence on the seismic responses of the structure with energy dissipation devices considering SSI effect, providing insight towards the performance-based seismic design of buildings rested at the near-fault sites considering the seismic SSI effect.