黄土地区地上两层地铁车站抗震性能振动台试验

为研究黄土地区地下一层地上两层地铁车站结构的抗震性能,进行包括地上、地下结构及周围土层的振动台试验研究.在简要介绍模型设计和试验工况的基础上,重点根据试验中各传感器所记录的数据,对模型土箱的边界效应、模型地基与模型结构的动力反应、土与结构的相互作用等进行分析探讨.试验结果表明:地下一层地上两层地铁车站模型结构地上部分受输入地震动峰值加速度影响较大,地上部分的最终破坏模式是整体侧向倒塌;车站模型结构地下部分受地下结构周围土层影响较大,土层位移不大时地下结构无明显破坏;地上地下结构交接处的破坏最为严重.模型车站结构的存在对土体动力反应的影响较小,并随输入地震动峰值的增大而减弱.

Shaking table test for anti-seismic performance of subway station in loess area with two floors aboveground

In order to investigate the anti-seismic performance of subway station with 2 aboveground storeys and 1 underground storey in the loess area, the shake table test of the both aboveground and underground structure and the surrounding soil layer is carried out. Based on the brief introduction of model design and loading condition, the boundary effect of model soil box, dynamic response of model soil and model structure, and the soil-structure interaction are emphatically analyzed and discussed according to the data recorded by sensors in the tests. Test results show that the aboveground part of the model subway station with 2 aboveground storeys and 1 underground storey in the loess area will be subjected to the larger influence of peak ground acceleration of input earthquake. The final failure pattern of the aboveground part will be the overall sidesway collapse. The underground part of the subway station will be subjected to the larger influence of the soil around the underground structure. There will be no obvious damage in the underground structure when the displacement of surrounding soil is small. The interface part between aboveground and underground structure will be subjected to the worst damage. The model subway station structure will have little influence on the dynamic response of surrounding soil, and the influence will decrease with the increase of the peak ground acceleration of input earthquake.