Fixed-Head Pile Bending by Kinematic Interaction and Criteria for Its Minimization at Optimal Pile Radius
Fixed-Head Pile Bending by Kinematic Interaction and Criteria for Its Minimization at Optimal Pile Radius
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DOI：
10.1061/(asce)1090-0241(2005)131:10(1243
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发表时间：
2005-10
影响因子：
3.9
通讯作者：
M. Saitoh
中科院分区：
文献类型：
--
作者：
M. Saitoh
本研究的重点是如何确定一个最佳的半径最小化的垂直，圆柱形固定头桩嵌入在一个均匀的弹性地层中的土桩结构系统的运动相互作用占主导地位的弯曲应变。为了确定合适的半径，基于三维波传播理论，推导了桩顶弯曲应变的闭合公式。通过将弯曲应变相对于土介质的平均剪应变进行归一化，可以得到封闭式公式的一般表达式。归一化弯曲应变可以用桩的半径与高度比、土与桩的刚度比以及表示桩头荷载与地基变形之间的相对振幅和相位滞后的因子来表示。参数分析的结果表明，存在一个最佳半径，局部最小化桩的弯曲应变。提出了确定土-桩-结构体系最佳半径的准则。
This study focuses on how to determine an optimal radius minimizing the bending strains of vertical, cylindrical fixed-head piles embedded in a homogeneous elastic stratum in soil-pile-structure systems where the kinematic interaction dominates. In order to determine the appropriate radius, closed form formulae for the bending strains at the head of the piles are derived based on three-dimensional wave propagation theory. A general expression of the closed form formulae can be obtained by normalizing the bending strains with respect to a mean shear strain of the soil medium. The normalized bending strains can be expressed by the radius to height ratio of the piles, the ratio of soil to pile stiffness, and a factor representing the relative amplitude and the phase lag between the loading at the head of the piles and the deformation of the ground. The results of parametric analyses reveal the presence of an optimal radius that locally minimizes the bending strains of the piles. Criteria for determining the optimal radius of soil-pile-structure systems are presented.