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以变形控制为主线,提出了横向应变传递率(STC)的概念,以研究土层向地下结构横向应变传递的影响因素和影响规律。采用二维非线性动力有限元,分析地震动不同输入(峰值和波形)、土层不同性能(剪切模量和土层厚度)以及地下结构特征(埋深、宽高比)等参数对STC的影响。结果表明,引入的横向应变传递率的概念可以反映地震荷载-地下结构-土体间相互作用问题的本质,各种参数对STC的影响具有规律性:土层软硬对应变传递率影响显著,二者间呈幂指数关系;地震动输入对应变传递率有一定影响,二者间呈抛物线关系;工程常见土层厚度内,土层厚度变化对应变传递率的影响不大,基本可以忽略;地下结构埋深、宽高比对应变传递率影响较小,应变传递率基本为一常数。
With deformation control as the main line, the concept of transverse strain transfer rate (STC) was proposed to study the influencing factors and influence laws of lateral strain transfer from soil layer to underground structure. Two-dimensional nonlinear dynamic finite element method was used to analyze the effects of different input (peak and waveform), different properties of soil (shear modulus and soil layer thickness) and subsurface structural characteristics (depth and aspect ratio) on STC Impact. The results show that the introduction of the concept of transverse strain transfer rate can reflect the nature of the seismic load-subsurface structure-soil interaction problem. The influence of various parameters on the regularity of STC is regular: soil soft and hard has a significant effect on the strain transfer rate, The relationship between them is exponential. The input of ground motion has a certain influence on the transmissibility of the strain, which shows a parabolic relationship between the two. The change of soil thickness within the thickness of common soil layer has little effect on the strain transmissibility, and can be ignored basically. Underground structure depth, aspect ratio of the strain rate of transmissibility less affected, the strain transfer rate is basically a constant.