形状异常的筏基在SV波作用下的水平与扭转响应

Horizontal and torsional responses of abnormally shaped raft foundation to SV-wave excitation

采用薄层元素法,建立了土-筏基动力相互作用分析模型,研究了"L"形和"C"形两种常见的异常形状刚性筏板在SV波作用下的水平与扭转响应。结果表明:在倾斜SV波作用下,形状异常的基础会产生较大的扭转响应,并随着凹进尺寸的增大而增大,"L"形基础的扭转响应比"C"形基础的扭转响应大;当SV波的入射角为临界角时,水平和扭转响应达到最大值。

A numerical model for dynamic soil-raft foundation interaction is developed by using the thin layered element method, and the horizontal and torsional responses of L-shaped and C-shaped rigid raft foundations, which are common in engineering, subjected to inclined SV wave excitation are studied. The results obtained indicate that： obliquely incident SV waves generate marked torsional responses in abnormally shaped foundations. The torsional response coefficients are greater for L-shaped foundations than those for C-shaped foundations and increase with increasing the size of the recessed part. When the incident angle of the SV wave is the critical angle, the horizontal and the torsional response coefficients reach the maximum values.