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

采用有限元方法,建立一系列土-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(SSSI)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.

With finite element method, a series of three- dimensional models of structures and soil were built to study the influence of seismic motion directions, the spectrum composition, shear wave velocities and damping ratios of the subsoil, the foundation forms and depths, floor numbers on structure-soil-structure interaction （ SSSI ） effect. The calculation result shows that SSSI effect can be ignored when the seismic motion is perpendicular to buildings＇ orientation. SSSI effect is directly bound up with the spectrum composition of the seismic wave. SSSI effect is apparent if the shear wave velocity is slow, the damping ratio is small and the foundation depth is shallow, and especially the floor numbers of buildings are the same.