地震作用下成层地基中结构物的动力响应

采用解析方法研究成层地基与结构物动力相互作用特性。将地震条件下土体与结构物作用力及其相对位移之间的关系简化为线性关系。假设土体和结构物均可简化为只发生水平位移的粘弹性剪切梁且地震输入为竖直向上传播的剪切波。在此基础上得到了一种新的浅埋于成层地基中的结构物动力响应的一维解析方法及其公式,该方法能够直接计算地震过程中土与结构上任意一点的响应。使用该方法初步分析了不同分层特性的地基中的浅埋结构物的加速度及位移等动力响应。结果表明地基的分层特性对结构物的加速度响应和所受的土体作用力影响很大。

Dynamic response of structures in layered soils during earthquakes

The dynamic interaction between structures and layered soils during earthquakes was studied analytically. The total earth pressure against the sidewalls of the structure was simplified to be proportional to the corresponding lateral soil-wall displacement during an earthquake. The structure and its surrounding soil layers were assumed to act as a group of visco-elastic beams which displace only in the horizontal direction. As a result, the analytical solution describes the dynamic soil-structure response for the simpler condition where a structure is partially buried in layered soils. The solution accurately describes the dynamic response at any spot in the soil and structure during an earthquake. The solution was employed to calculate the dynamic acceleration and displacement response of a partially buried structure in layered soils with different shear moduli distributions. The results show that the mechanical characteristics of the layered soils significantly affect the dynamic structure response and the earth pressures acting on the structure.