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近年来,随着地下结构数量的增多和震害的频繁出现,储液池因功能的特殊性,其抗震设计日益受到重视。场地土的动力特性直接影响储液池结构的抗震性能,因此考虑土层动力特性的土弹簧刚度分析是十分必要的。首先依据场地土类别和结构的固有周期,计算结构的基准水平震度k_(h0),使用震度法,依据k_(h0)计算动荷载并对整体模型进行静力线弹性计算,得到两级地震、四个加震方向共8个工况下与结构相邻各侧土层的平均剪切角γ;其次依据土层G/G_0-γ曲线,计算每个工况下各侧土层动剪切模量值G并分析影响因素;最后由G计算土弹簧刚度用以模拟各侧土和储液池的动力作用关系。通过本文分析,为模拟地下储液池与场地土动力相互作用的土弹簧刚度分析提供了一种简易、可行的方法。
In recent years, with the increase of the number of underground structures and the frequent occurrence of earthquake damage, the anti-seismic design of reservoir is paid more and more attention because of its special function. The dynamic characteristics of the site soil directly affect the seismic performance of the reservoir structure. Therefore, it is necessary to analyze the soil spring stiffness considering the dynamic characteristics of the soil layer. Firstly, the basic horizontal seismicity k_ (h0) of the structure is calculated according to the natural period and the natural period of the structure. Using the seismic method, the dynamic load is calculated according to k_ (h0) And the mean shear angle γ of the soil layers adjacent to each other under eight conditions with four seismic directions. Secondly, according to the curve of soil G / G_0-γ, the dynamic shear strength of each soil layer under each condition is calculated Modulus value G and analyze the influencing factors. Finally, the stiffness of soil spring is calculated by G to simulate the dynamic interaction between each side soil and reservoir. Through the analysis in this paper, a simple and feasible method is provided for the analysis of soil spring stiffness that simulates the interaction of underground reservoir with site soil.