建筑群结构-土-结构相互作用的影响参数研究

Parametric study on structure-soil-structure interaction of high-rise buildings

摘要:

座落于软土之上的密集高层建筑群不断涌现，其结构-土结构相互作用（SSSI）不可忽视。本文采用有限元方法，建立了一系列土-结构系统的三维模型，研究了地震动激励方向及频谱成分、土层剪切波速及阻尼比、基础形式及埋深、上部结构楼层数等对结构-土-结构相互作用规律的影响。分析结果表明：在垂直于结构物排列方向的地震动激励下，SSSI效应几乎为零；SSSI效应的大小与地震波频谱成分密切相关；剪切波速小、阻尼小、基础埋深浅，则SSSI效应明显；两边结构与目标结构的楼层数相同时，SSSI效应最明显。

Abstract:

There are more and more high-rise buildings erected on soft soil. The structure-soil-structure interaction cannot be ignored. Through finite element method, a series of three-dimensional models of structures and soil were built to study on the influence of direction of seismic motion, spectrum composition, shear wave velocity and damping ratio of subsoil, foundation form and depth, number of floors on SSSI effect. The calculated result shows that, SSSI effect can be ignored with seismic motion perpendicular to buildings' orientation; SSSI effect is directly bound up with spectrum composition of seismic wave; SSSI effect is apparent if shear wave velocity was slow, damping ratio was small, foundation depth was shallow, and the numbers of floors of buildings were the same.