地震作用下河流对成层中软土上建筑物的影响

为研究河流对成层中软土地基上建筑物地震反应的影响,构建河流-土体-结构体系动力相互作用的非线性完全有限元计算模型,在考虑土体重力的前提下,分别采用三条地震波对此相互作用体系进行时域内数值分析。计算结果表明,建筑物靠近河流时,结构顶层总位移、基础的水平移动和转动明显增大,并产生明显的不可恢复偏移;软弱夹层的存在,使整个相互作用体系的地震反应增大。

Effect of river on the structures on layered medium-soft-soil under seismic action

In order to study the effect of rivers on structure on layered medium-soft-soil under seismic action, a non-linear finite element model is established for the interaction among the river, soil and structures. Numerical computationis preformed in time domain under three seismic waves with the consideration of gravity. The results revealed that when the structure is close to the river the total displacement at the top of the structure, the horizontal displacement and rotation of its foundation increase obviously, leading to irreversible displacement. The response of the structure under seismic action increases due to the presence of soft soil sandwich.