Resistance of Short, Stiff Piles to Multidirectional Lateral Loadings
Resistance of Short, Stiff Piles to Multidirectional Lateral Loadings
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短而硬的桩对多向横向荷载的抵抗力
DOI：
10.1520/gtj103840
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发表时间：
2012-02
影响因子：
1.6
通讯作者：
Su, D.
中科院分区：
文献类型：
--
作者：
Su, D.
在某些情况下，作用在桩基上的横向荷载是多方向的。然而，以往的研究大多只考虑单向水平荷载作用下的桩土相互作用。本文介绍了一种利用计算机数控双轴运动平台进行的单向和多向水平荷载作用下桩-砂体系的综合试验研究。桩顶位移路径包括单向规则路径、十字形路径、"8“字形路径、单向和多向不规则路径，其位移幅值和位移幅值沿水平方向沿着的纵横比α不同。试验结果表明，沿沿着一个水平方向的预加荷影响随后沿沿着正交水平方向的反应，在桩阻力和力增量矢量的方向。在8字形试验中，大多数情况下的力-位移曲线的形状与单向常规试验所得的力-位移曲线的形状显著不同，并且与单向常规试验不同，最大力出现在位移达到最大值之前。在这些试验中，力增量矢量的方向总是偏离位移增量矢量的方向。根据规则和不规则载荷试验结果，多方向路径下桩的侧阻力普遍低于单方向路径下的侧阻力，且降低程度随高宽比（α）的增大而增大。力比（rF）定义为多向试验中的最大力与单向试验中的最大力，可表示为α的指数函数。考虑到阻力的降低可以达到大约30%，忽略多方向加载效应在某些情况下可能导致不保守的分析或设计。
Lateral loads applied to pile foundations in some cases are multidirectional. However, most of the past studies only considered soil-pile interaction under unidirectional horizontal loadings. This paper describes a comprehensive experimental study on a pile-sand system under both unidirectional and multidirectional horizontal loadings using a computer numerically controlled biaxial motion platform. The displacement paths at the pile head include unidirectional regular paths, cross paths, figure-8 paths, and unidirectional and multidirectional irregular paths with different displacement amplitudes and different aspect ratios of the displacement amplitudes along two horizontal directions (α). The test results indicate that the preloading along one horizontal direction influences the subsequent response along the orthogonal horizontal direction, in terms of the pile resistance and the direction of the force increment vector. In the figure-8 tests, the shapes of the force-displacement curves in most cases differ significantly from that obtained from the unidirectional regular test and different from the unidirectional regular test, the maximum forces appear before the displacements reach the maximum values. In these tests, the direction of the force increment vector always deviates from the direction of the displacement increment vector. According to the results of the regular and irregular loading tests, the lateral resistance of the pile under the multidirectional paths is generally lower than that under the unidirectional path, and the degree of reduction increases with the aspect ratio (α). The ratio of force (rF), defined as the maximum force in the multidirectional tests to that in the unidirectional test, can be expressed as an exponential function of α. Considering that the reduction in the resistance can reach as large as about 30%, overlooking the multidirectional loading effect can lead to unconservative analysis or design in some cases.
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影响因子：
5.8
作者：
D. Su;X. Li
通讯作者：
D. Su;X. Li
DOI：
10.1061/(asce)1090-0241(1997)123:12(1153
发表时间：
1997-12
影响因子：
3.9
作者：
P. Ruesta;F. Townsend
通讯作者：
P. Ruesta;F. Townsend
影响因子：
1.6
作者：
T. Ueng;Ming-Huei Wang;Mingyong Chen;C. Chen;Li Peng
通讯作者：
T. Ueng;Ming-Huei Wang;Mingyong Chen;C. Chen;Li Peng
DOI：
10.1061/(asce)1090-0241(1999)125:11(936
发表时间：
1999-11
影响因子：
3.9
作者：
L. Zhang;M. McVay;P. Lai
通讯作者：
L. Zhang;M. McVay;P. Lai
DOI：
10.1061/(asce)1090-0241(1998)124:6(468
发表时间：
1998-06
影响因子：
3.9
作者：
K. Rollins;K. Peterson;T. Weaver
通讯作者：
K. Rollins;K. Peterson;T. Weaver