形状不规则筏基在SH波下的动力响应研究  

Research on Dynamic Response of Irregularly Shaped Raft Foundation to SH-wave Excitation

作　　者：文学章[1] 蒋林[1] 尚守平[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2014年第3期14-19,共6页Journal of Hunan University:Natural Sciences

基　　金：教育部高等学校博士学科点专项科研基金资助项目(20090161120003);国家科技支撑计划项目(2011BAJ08B00)

摘　　要：采用薄层元素法,建立了土筏板基础动力相互作用分析模型,并研究了形状不规则筏板基础在倾斜SH波作用下的动力响应.对平面形状为'L'形和'C'形的刚性筏板基础的动力响应进行了比较分析,结果表明:在倾斜SH波作用下,在一定的频率范围内,随着其入射角的增大以及其频率的增大,基础的水平响应减小,同时还会产生扭转响应.基础的不规则对其水平响应产生较大的影响,由于缺口位置的不同,'L'形基础与'C'形基础表现出不同的变化趋势.基础的不规则对其扭转响应在低频区域的影响较小,而对'C'形基础在高频区域的影响较大.A numerical model for dynamic soilraft foundation interaction was developed by using the thin layered element method, and the dynamic response of irregularly shaped raft foundation subjected to inclined SH wave excita tion was studied. Lshaped foundations and Cshaped foundations were considered. The results have shown that, when subjected to a nonvertically incident SH wave, with the increase of frequency as well as the increase of incident angle, the horizontal response decreases in a certain frequency range. And the torsional response is also generated. The irregularity of raft foundation has a great effect on the horizontal response. The trends are different in Lshaped foundations and Cshaped foundations, due to the different positions of the hole. The effects of the irregularity of raft foundation on the torsional response are very little in lowfrequency region, but are great for the Cshaped foundations in highfrequency region.

关 键 词：土-结构动力相互作用 动力响应 不规则形状筏板基础 扭转 

分 类 号：TU473[建筑科学—结构工程]