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3-D numerical analysis on seismic responses of the underground large scale frame structure under near-fault ground motions

机译:近故障地面运动下地下大规模框架结构地震反应的三维数值分析

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This paper mainly focuses on seismic responses of the underground large scale frame structure (ULSFS) under near-fault ground motions with the long-period velocity pulse and high-frequency components. 3-D finite models of the ULSFS with great scales along two horizontal directions are proposed by an underground supermarket under building. A representative near-fault ground motion including the long-period velocity pulse and high-frequency components is selected from the Northridge earthquake. Through parametric analyses, the distinctive seismic responses of the ULSFS under the near-fault ground motion have been highlighted. In addition, the typical near-fault ground motion is decomposed into the low-frequency motion and the high-frequency motion to investigate effects of the soil deformation and structural vibration on the ULSFS, respectively. This study reveals that there are obvious tensile damages on the outside floor slabs and walls where soil-structure interaction is great; and bottom columns have the greatest horizontal deformation and tensile damage with an increase from outside to inside of the ULSFS, and top second-columns perform the salient flexural deformation due to soil-structure interaction. Moreover, the dynamic vibration of the ULSFS not only enlarges the whole seismic responses but also causes the severe tensile damage on outside floor slabs and walls; and the soil deformation in the long-period velocity pulse is more likely to result in the increasing internal forces of bottom columns and the flexural deformations of top second-columns.
机译:本文主要集中在带有长周期速度脉冲和高频分量的近断层地运动下地下大规模框架结构(ULSF)的地震反应。建筑物下的地下超市提出了沿两个水平方向具有巨大鳞片的ULSF的3-D有限型号。包括长周期速度脉冲和高频分量的代表性接近故障接地运动选自北极地震。通过参数分析,突出了近端故障地面运动下ULSF的独特地震反应。此外,典型的近故障接地运动分解成低频运动和高频运动,以分别研究土壤变形和结构振动对ULSF的影响。本研究表明,外层板和墙壁上存在明显的拉伸损坏,其中土壤结构相互作用很大;底柱具有最大的水平变形和抗拉损伤,随着ULSF的内部增加,顶柱由于土壤结构相互作用而进行凸出的弯曲变形。此外,ULSF的动态振动不仅扩大了整个地震响应,而且还会导致外层板和墙壁上的严重拉伸损伤;长周期速度脉冲中的土壤变形更可能导致底柱的内部力增加以及顶部第二柱的弯曲变形。

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