增设斜支撑的双桩基础水平承载特性试验分析

Experimental analysis on horizontal bearing behavior of double-pile foundations with oblique support

为研究斜支撑对双桩基础的水平受力性能的影响,建立了普通双桩基础与增设斜支撑双桩基础的室内试验模型,通过施加水平往复荷载,对两种不同桩基础的荷载位移曲线和桩身弯矩分布情况进行比较分析。分析结果表明:在水平承载力方面,增设斜支撑双桩基础略高于普通双桩基础;两桩之间增设斜支撑可使桩身弯矩峰值下移;增设斜支撑对提高双桩基础的抗弯刚度及抑制桩身的弯曲变形都有一定作用。并建议适当增加斜支撑以改善双桩基础的受力性能。

In order to study the influence of oblique support on the horizontal bearing capacity of double-pile foundation,indoor test models of the ordinary double-pile foundations and those with oblique support were established. The load-displacement curves and the bending moment distribution of the foundations were compared and analyzed after applying horizontal cyclic loading. Analysis results show that the double-pile foundation with oblique support has slightly better horizontal bearing capacity thanthe ordinary double-pile foundation; that the additional oblique support between the two piles could reduce the peak bending moment; that the support plays a certain role in improving the bending stiffness of double-pile foundations and restraining the bending deformation of the pile body.Proper increase of oblique support could improve the bearing capacity of double-pile foundations.