超大型Y形柱地铁车站振动台试验研究

摘要

以北京地铁新华大街站站为背景，开展大型Y形柱地铁车站结构振动台模型试验，研究并对比分析单/双层Y形柱地铁车站结构地震响应特点。结果表明：1)相同强度地震作用下，两种工况的加速度峰值变化规律大体相同，但双层工况中结构模型各测点的加速度峰值大于单层工况。2)当结构模型中部存在中板时，结构模型在地震荷载作用下的应变分布规律发生较大改变，使得单层Y形柱结构模型的应变幅值与双层Y形柱结构模型的应变幅值相差很大，其中Y形柱结构尤为突出。%The shaking table test of the ultra-large subway station structure with Y-shape column taking Xinhua street station in Beijing metro as background is carried out, and research on the seismic response of single and double Y-shape column subway station structure is achieved. The results show that, 1)The change rule of acceleration peak is similar in same seismic intensity, while the acceleration peak of double condition is larger than the single layer con-dition;2)once a middle plate is added to the station structure, the distribution regularities of strain changed signifi-cantly under earthquake action. It will lead to the strain amplitude of single Y-shape column station structure become different with that of double Y-shape column station structure,especially Y-shape column structure.