筒仓形地下车库地震响应分析

Earthquake Response Analysis of Silo-shaped Underground Parking Garage

摘要

为研究地震作用下筒仓形地下车库结构响应的变化规律,基于振动台试验和数值模拟方法,通过监测结构应力分布、位移、变形响应以及加速度等指标,分析了不同入射方向、峰值加速度、加载频率的地震波对结构响应的影响。结果表明:不同入射方向地震波作用下,应力集中区域不变;水平地震波作用时,结构水平(平行于地面)方向响应大于竖向(重力方向),竖向地震波作用时则相反,楼板竖向响应明显;水平方向-竖向耦合地震波加剧土体振动,结构应力增大;峰值加速度变化不改变应力分布,但会使应力集中现象更显著;频率过高或过低,径向应力变化不大。综合来看,应力主要集中在筒壁与底板、柱与楼板连接处,是抗震设计重点区域。

Abstract

To study the variation law of the response of silo-shaped parking garages under the seismic action, vibration table tests and numerical simulation methods were employed. The effect of seismic waves with different incident directions, peak accelerations, and loading frequencies on the seismic response of the structure was analyzed by monitoring the stress distribution, displacement, deformation response, and acceleration of the structure. The results show that the stress concentration areas remain unchanged under different incident directions. When the horizontal seismic wave acts, the response of the structure in the horizontal direction (the direction parallel to the ground) is greater than that in the vertical direction (gravity direction), while when the vertical seismic wave acts, the opposite is true, and the vertical response of the floor slab is obvious. The horizontal-vertical coupled seismic wave intensifies the vibration of the soil and increases the structural stress. The change of peak acceleration does not cause a change in stress distribution, but will make the stress concentration phenomenon more significant. When the frequency is too high or too low, the change of radial stress is not significant. Overall, the stress mainly concentrates at the joints between the cylinder wall and the bottom plate, as well as those between the columns and the floor slabs, which are the key areas for aseismic design.

关键词

地震作用 / 筒仓形车库 / 应力分布 / 变形响应 / 时程分析

Key words

seismic action / silo-shaped parking garage / stress distribution / deformation response / time history analysis

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基金资助

中央引导地方科技发展资金项目(236Z5409G)

国家自然科学基金青年科学基金资助项目(52308458)