地表建筑对地下车站结构地震响应的影响

由于在地震中邻近地表建筑对地基周围场地的扰动，必然会对周围的地下结构动力响应产生影响。本文构建了地表建筑-土-地下车站结构共同作用计算模型。在该计算模型中引入了土体的非线性本构模型，同时考虑了结构与土的接触面特性和地基无限域的影响，对该体系进行了地震反应的时域分析。计算结果表明：由于地表邻近建筑物的存在，地下结构的位移、内力等地震响应均有较大的增加。同时也研究了地表建筑的自振周期和相对距离等因素的变化对地下结构动力响应的影响，得到了一些规律性的结论，为工程设计提供有益参考。

Influence of ground surface building on seismic response of underground station structure

Due to the disturbance of ground adjacent building to the site,the seismic response of underground structure in the site will be influenced.The non-linear interaction finite element models were set up,which are composed of buildings,soil and underground structures.A hysteretic nonlinear soil constitutive model was used in the analysis.In the interaction finite element models were taken into account,the contact surface characteristics between the structure and soil and the impact of foundation’s infinite domain.The models were analyzed numerically in time domain.The results show that the displacement response and force response of underground station structure are significantly amplified due to the existence of ground adjacent building.Additionally,a comparative study on influencial factors which affect the seismic response of underground structures was carried out.Here,the influencial factors include natural periods of adjacent building and relative distances between ground buildings and underground structures.Some useful conclusions were obtained through analysis,which are beneficial to engineering designs.