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倾斜受压荷载作用下斜桩受力特性的数值分析

, PP. 57-61

Keywords: 桥梁工程,受力特性,数值模拟,斜桩,倾斜荷载

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Abstract:

为揭示倾斜受压荷载作用下斜桩的受力特性,基于非关联流动Mohr-Coulomb准则的弹塑性本构关系,建立三维弹塑性有限元模型,分析了倾斜荷载作用下荷载倾角和桩身倾角对斜桩受力特性的影响。结果表明当荷载倾角较小时,倾斜荷载作用下的斜桩刚度同时取决于轴向与水平向刚度,二者刚度存在一个平衡,导致斜桩刚度并非在轴向受力时达到最大斜桩极限抗压承载力随着荷载倾斜角度呈现M型,桩身极限抗压承载力峰值并非出现在轴向受力时,而出现在荷载倾斜小角度附近正向倾斜荷载作用下,桩的刚度和承载力均随桩身倾角的增大而增大,在负向倾斜荷载作用下,其结果却相反不同倾角斜桩的极限荷载受桩—土摩擦系数影响较大。

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