【摘要】 地铁车站横断面抗震分析通常采用考虑土—结构相互作用的二维平面应变模型,中柱简化为沿纵向连续墙体,在保证中柱质量不变前提下,通过折减墙体的几何尺寸或材料参数使其具有与中柱相同的截面抗弯刚度EI或抗压刚度EA,四种折减方式为:EA横向几何折减、EI横向几何折减、纵向几何折减和弹模折减。通过某两层三跨地铁车站结构抗震分析,讨论了上述四种折减方式的可行性。结果表明,弹模折减和纵向几何折减引起的变形和内力误差均较小,适用于地下结构横断面抗震分析。更多还原

【Abstract】 Two-dimensional plane strain model was usually used in the seismic analysis of subway station considering soil-structure interaction. The column is simplified as continuous wall along the longitudinal. Under the premise that the quality of the center column remains unchanged, reducing the geometry size or material parameter of continuous wall to obtain the same sectional flexural stiffness EI or compressive stiffness of EA as that of column. Four reduction ways are: EA transverse lateral geometric reduction geometric reduction, EI longitudinal geometric reduction and elastic modulus reduction. This paper discusses the feasibility of the above four reduction methods through seismic analysis of a two-story and three-span subway station structure. The results show that the deformation and internal force errors caused by elastic reduction and longitudinal geometric reduction are small, which is suitable for cross-section seismic analysis of underground structures.更多还原