地基土考虑材料阻尼影响的抗震性能分析

摘要

The seismic performance of an underlying soil model was conducted by finite element time-history dynamic analysis method by considering the material damping effect from different layers in the underlying soil and seismic reduction area. The soil model was numerically analyzed by a point pulse load atop its layer, the seismic reduction effect of the geometric size in seismic reduction area (including width, depth and its location) and material damping effect from the different soil materials were investigated. The results show that the less distance between the seismic reduction areas, the more effective in the seismic reduction effect. Greater width in seismic reduction area can be helpful to the seismic reduction effect. However, greater depth in seismic reduction area can be less helpful to the seismic reduction effect.%利用大型通用有限元软件，结合时程动力分析法，针对地基土和减震槽材料采用沿高度分层变化的不同阻尼参数材料时，考虑动力系统阻尼矩阵中材料相关阻尼和单元阻尼的相关贡献，综合分析减震槽采用不同深度和宽度，以及减震槽右端到震源不同水平距离时，在土体顶部承受脉冲荷载作用下，地基土顶部各节点的最大振动加速度响应。研究结果表明：减震槽到震源的水平距离越小，减震效果随果越明显。随减震槽的宽度增大减震效果越为明显。减震槽的深度增加对其减震效果增加效果不明显。