砂土地基中混凝土实心方桩水平承载特性分析

Analysis of Lateral Bearing Behavior of Concrete Solid Square Pile in Sand

通过大型通用有限元软件ABAQUS进行了实心方桩水平荷载特性的系统研究,采用弥散开裂模型模拟混凝土的损伤破坏行为。首先对已有方桩水平承载力原位实验进行数值模拟,计算结果与相关试验数据比较吻合。进而探讨桩周土的性质、竖向荷载、桩身配筋率等因素对实心方桩水平特性的影响。结果表明:增大竖向荷载水平使方桩桩体弯矩最大值变大,但总体上改善实心方桩的水平承载性能。增加配筋率可以明显降低桩顶的水平位移。配筋率较高时,其承载力容许值决定于桩头侧移,而配筋率较低时受到桩体裂开控制。

In this paper,the response of square concrete pile subjected to lateral loading is analyzed through finite element numerical analyses,in which non-linear damage behavior of concrete is modeled through smeared cracking model. The finite element model is validated against available lateral static loading test in situ of single pile. The computed results agreed well with those from the in-situ tests. The effect of property parameter of soil,vertical load level and reinforcement ratio of piles investigated on the lateral capacity of pile. The results show that the vertical load may improve its performance,and it will also increase the peak moment in the pile body. For the pile with low reinforcement ratio,the allowable lateral capacity is determined by concrete cracking of pile,however the lateral capacity is controlled by displacement of pile with high reinforcement ratio.