Influence of Wall Flexibility on Seismic Earth Pressures in Vertically Homogeneous Soil

S. Brandenberg, J. Stewart, G. Mylonakis
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引用次数: 4

Abstract

Solutions are formulated for seismic earth pressures acting on vertical flexible walls with the top and bottom constrained by discrete elastic stiffness elements (top constraint representing a structural constraint, bottom constraint representing foundation stiffness). Solutions are formulated using the Winkler assumption and correspond to shear waves propagating vertically through homogeneous soil. Earth pressures decrease as wall flexibility increases. Rotational and translation constraints at the top and bottom of the wall also contribute to mobilization of seismic earth pressures. Current standard-of-practice procedures are based on limit analysis methods that do not consider the influence of frequency, wall flexibility, structural constraints, or soilstructure interaction (SSI) in general. The proposed approach is more robust because wave propagation effects are considered and seismic earth pressures result from the product of relative wall-soil displacements and stiffness at the wall-soil interface.
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竖向均质土中墙体柔韧性对地震土压力的影响
针对竖向柔性墙体的地震土压力,给出了相应的解决方案。竖向柔性墙体的顶部和底部受到离散弹性刚度元素的约束(顶部约束代表结构约束,底部约束代表基础刚度)。解决方案是用温克勒假设,并对应于横波垂直传播通过均匀的土壤。土压力随着墙体柔韧性的增加而降低。墙的顶部和底部的旋转和平移约束也有助于地震土压力的动员。目前的实践标准程序是基于极限分析方法,通常不考虑频率、墙体柔韧性、结构约束或土-结构相互作用(SSI)的影响。该方法考虑了波的传播效应,且地震土压力是土体相对位移和土体界面刚度的乘积,因此具有较强的鲁棒性。
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