成层地基与浅埋结构物动力相互作用的简化分析

基于任意侧向位移下挡土墙地震土压力理论,建立了新的地基-浅埋式结构物相互作用力与其相对位移之间的关系,并对该关系加以推广,应用到成层地基及深基础情形。提出了一种实用的求解成层地基-浅埋式结构物动力相互作用的简化质-阻-弹模型,该方法概念简单合理,参数确定简便,不需迭代,计算量小,可适用于以下情形:1) 结构物可视为粘弹性介质;2) 地基和浅埋式结构物可简化为一维运动;3) 结构物运动对土体运动的影响忽略不计。

SIMPLIFIED ANALYSIS OF DYNAMIC INTERACTION BETWEEN LAYERED SOILS AND SEMI-BURIED STRUCTURE

Based on the modification of a seismic earth pressure theory for retaining structures under any lateral displacements, new formulas are proposed to determine the relationship of lateral soil-wall displacement and corresponding earth pressures against the sidewalls of the structure during an earthquake. The formulas can be extended to layered soils and deep foundations. A simplified mass-damping-spring model with the formulas is presented for dynamic interaction between layered soils and semi-buried structure. The model is feasible because parameters are easily obtained and no iteration is needed. The model is effective under the following conditions: 1) The soils behave as a 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) The soil抯 response is not affected by the structure抯 movement.