地基中结构物动力响应的一维解析方法

Simplified evaluation for dynamic response of soil structure

提出了一种用于浅埋式地下结构物抗震设计的简化方法。采用任意侧向位移下地震土压力理论 ,推得在土 -结构相对位移较小的情况下 ,结构物所受的土作用力与它们的相对位移近似成线性关系 ,并提出了确定解析解中需要的地基结构动力相互作用系数的方法。在将土体和结构物均简化为只发生水平位移的粘弹性剪切梁及地震输入为竖直向上传播的剪切波等假设条件下提出了一种分析水平地基中结构物在地震荷载作用下的响应的一维解析方法 。

A new method used to determinate coefficients of dynamic soil structure interaction is presented based on the modification of a seismic earth pressure theory for retaining structures under any lateral displacements. In addition, a new analytical solution for the evaluation of dynamic response of a structure semi buried in soils is presented under the following assumptions: 1) the soil behaves as visco elastic medium; 2) the structure and its surrounding soil layers are represented as a group of shear beams which displace in horizontal direction only; and 3) seismic excitation is due to shear waves propagating vertically. From the dynamic interaction analysis using the analytical solution, it is found that the dynamic interaction force between the semi buried underground structure and its surrounding soil is approximately proportional to their relative displacement in seismic shearing. As a simplified method, the present dynamic analysis using the solution is shown to be very effective for the evaluation of dynamic soil structure response.