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Comparative numerical analysis on dynamic effects of underground large scale frame structures under seismic waves

机译：地震作用下地下大型框架结构动力效应的比较数值分析

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摘要

In this paper, dynamic effects of the underground large scale frame structure (ULSFS) with large scales along both two horizontal directions are investigated by 3-D numerical analyses. To guarantee the accuracy of seismic inputs, seismic waves are transformed into equivalent forces adding on the truncated boundary nodes based on the viscous-spring artificial boundary. 3-D finite element models of 4-span, 8-span, and 20-span underground frame structures with surrounding foundation are proposed to simulate small, middle and large scale underground structures. For a comprehensive study of results, another two analyses of the ULSFS are proposed to evaluate the two dynamic effects of structures: structural inertial effects on inner structures, and effects of structural vibration on the whole soil-structure system, respectively. Furthermore, several soil conditions are employed to study influences of the relative stiffness between the structure and soil on the two mentioned dynamic effects of the ULSFS. The results demonstrate that dynamic effects of the ULSFS are much more significant compared with small scale underground structures which make the structural deformations and internal forces to be larger; and dynamic effects of the ULSFS would decrease with increasing elastic moduli of surrounding soils due to great soil constraints.
机译：本文通过3-D数值分析研究了沿两个水平方向大比例尺的地下大型框架结构（ULSFS）的动力效应。为了保证地震输入的准确性，在粘性弹簧人工边界的基础上，将地震波转换为等效力，并添加到截断的边界节点上。提出了具有周围基础的4跨，8跨和20跨地下框架结构的3-D有限元模型，以模拟小型，中型和大型地下结构。为了对结果进行全面研究，建议对ULSFS进行另外两种分析，以评估结构的两种动力效应：分别对内部结构的结构惯性效应和对整个土壤-结构系统的结构振动效应。此外，采用了几种土壤条件来研究结构与土壤之间的相对刚度对上述两种ULSFS动力效应的影响。结果表明，与小型地下结构相比，ULSFS的动力效应更为显着，小型地下结构使结构变形和内力增大。由于土壤的限制，ULSFS的动力效应会随着周围土壤弹性模量的增加而降低。

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