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城市地下隧道的存在将改变地表临近既有建筑的地基条件,进而影响建筑的地震响应。基于广义层间位移谱,研究地下隧道对距隧道不同距离的地表建筑结构的层间位移的影响,同时分析隧道对结构层间位移沿无量纲高度分布的影响。结果表明:地下隧道的存在将增加临近地表建筑结构的层间位移,对结构的安全性带来危害,在工程设计和分析中不容忽视;当地表建筑位于距离隧道中心线2倍隧道直径的区域外时,隧道的影响可以忽略;隧道的存在对临近建筑结构层间位移沿高度分布趋势的影响并不明显,但是将显著增加结构抗震性能薄弱部位的层间位移。
The existence of underground tunnels in the city will change the ground conditions near the existing buildings and thus affect the seismic response of the buildings. Based on the generalized interlayer displacement spectrum, the influence of underground tunnels on the interlayer displacements of the surface structures at different distances from the tunnels is studied. At the same time, the influence of the tunnels on the dimensionless height distributions of the structural layers is analyzed. The results show that the existence of underground tunnels will increase the interlayer displacement near the surface structure, which will bring harm to the safety of the structure. It can not be ignored in the engineering design and analysis. The local surface structure is located in the area of 2 times of tunnel diameter from the tunnel centerline The influence of the tunnel on the distribution of displacement along the adjacent building structure is not obvious. However, it will significantly increase the interlayer displacement at the weak part where the seismic performance of the structure is weak.