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Large shaking table tests of pile-supported structures in different ground conditions
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.soildyn.2020.106307
Chengshun Xu , Pengfei Dou , Xiuli Du , M. Hesham El Naggar , Masakatsu Miyajima , Su Chen

Abstract This study investigates the dynamic response of structures and the effect of soil-structure interaction for flexible structures supported by pile foundations located in non-liquefiable and liquefiable sites as well as a rigid foundation. A series of large-scale shaking table experiments were performed, and accelerations and dynamic displacements of model superstructures were recorded during the shaking events. It was observed that the structure in non-liquefiable soil deposits had the highest accelerations due to the amplification of ground motion within the soil. On the other hand, the accelerations of the structure in liquefied site was small due to the increased dissipation of seismic energy. The structures founded on soil experienced residual (permanent) lateral displacements, with the permanent lateral displacement and tilting of the structure in the liquefied site being much larger. The structure on rigid foundation (i.e. foundation on rock or fixed base) experienced high accelerations and oscillatory displacement as the seismic energy could not be dissipated. Therefore, structures in liquefiable soil are prone to overturning damage due to failure of their foundations. Furthermore, the base shear force of the structure in the non-liquefied site was significantly larger than that in the liquefied site and fixed-base, indicating it would be more susceptible to shear failure. On the other hand, the fixed-base structure experienced relatively large acceleration and dynamic displacement responses, which indicates increased seismic demands on its structural members.

中文翻译:

不同地基条件下桩承结构大振动台试验

摘要 本研究研究了结构的动力响应和土-结构相互作用对由位于不可液化和可液化场地以及刚性地基中的桩基支撑的柔性结构的影响。进行了一系列大型振动台实验,并记录了振动过程中模型上部结构的加速度和动态位移。据观察,由于土壤内地面运动的放大,不可液化土壤沉积物中的结构具有最高的加速度。另一方面,由于地震能量耗散的增加,液化场地结构的加速度很小。建立在土壤上的结构经历了残余(永久)横向位移,液化现场结构的永久横向位移和倾斜要大得多。由于地震能量无法消散,刚性基础(即岩石基础或固定基础)上的结构经历了高加速度和振荡位移。因此,可液化土壤中的结构容易因地基失效而发生倾覆损坏。此外,非液化场地结构的基础剪力显着大于液化场地和固定基础的结构,表明它更容易发生剪切破坏。另一方面,固定基础结构经历了相对较大的加速度和动态位移响应,这表明对其结构构件的抗震要求增加。由于地震能量无法消散,刚性基础(即岩石基础或固定基础)上的结构经历了高加速度和振荡位移。因此,可液化土壤中的结构容易因地基失效而发生倾覆损坏。此外,非液化场地结构的基础剪力显着大于液化场地和固定基础的结构,表明它更容易发生剪切破坏。另一方面,固定基础结构经历了相对较大的加速度和动态位移响应,这表明对其结构构件的抗震要求增加。由于地震能量无法消散,刚性基础(即岩石基础或固定基础)上的结构经历了高加速度和振荡位移。因此,可液化土壤中的结构容易因地基失效而发生倾覆损坏。此外,非液化场地结构的基础剪力显着大于液化场地和固定基础的结构,表明它更容易发生剪切破坏。另一方面,固定基础结构经历了相对较大的加速度和动态位移响应,这表明对其结构构件的抗震要求增加。岩石或固定基础上的基础)经历了高加速度和振荡位移,因为地震能量无法消散。因此,可液化土壤中的结构容易因地基失效而发生倾覆损坏。此外,非液化场地结构的基础剪力显着大于液化场地和固定基础的结构,表明它更容易发生剪切破坏。另一方面,固定基础结构经历了相对较大的加速度和动态位移响应,这表明对其结构构件的抗震要求增加。岩石或固定基础上的基础)经历了高加速度和振荡位移,因为地震能量无法消散。因此,可液化土壤中的结构容易因地基失效而发生倾覆损坏。此外,非液化场地结构的基础剪力显着大于液化场地和固定基础的结构,表明它更容易发生剪切破坏。另一方面,固定基础结构经历了相对较大的加速度和动态位移响应,这表明对其结构构件的抗震要求增加。非液化场地结构的基础剪力显着大于液化场地和固定基础结构,表明其更容易发生剪切破坏。另一方面,固定基础结构经历了相对较大的加速度和动态位移响应,这表明对其结构构件的抗震要求增加。非液化场地结构的基础剪力显着大于液化场地和固定基础,表明结构更容易发生剪切破坏。另一方面,固定基础结构经历了相对较大的加速度和动态位移响应,这表明对其结构构件的抗震要求增加。
更新日期:2020-12-01
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