基于非线性动力学确定端承桩单桩竖向承载力

Determination of single end bearing pile vertical capacity based on nonlinear dynamic theory

灌注混凝土端承桩的竖向承载力确定方法较多,但没有一种有足够说服力的确定方法。从端承桩的本构关系具有突变性出发,基于非线性动力学的基本理论,获得了单桩承载力的确定方法,并给出了延性破坏和脆性破坏的界定标准。以上海某工程为例,将计算值与试验值比较,二者吻合较好,证明了用非线性动力学方法分析单桩竖向承载力是可行且高效的。为进一步研究灌注混凝土端承桩竖向承载力和制定相关规范提供了参考。

Though several theories have been introduced to determine the vertical capacity of cast-in-place end bearing pile, none of them is persuasive enough as many factors are not easy to decide, such as it is extremely difficult to distinguish ductility failure and brittle failure of end bearing pile in reality. Based on the catastrophe character of its constitutive relation, the vertical capacity of end bearing pile and the criteria to differentiate the two kinds of failure are determined though the nonlinear dynamic theory. Take an engineering project of Shanghai for example, the calculated data and experimental data agree well with each other, showing that determining the vertical capacity of end bearing pile with the nonlinear dynamic theory is available and effective. It is useful for the further research of the pile vertical capacity and designing of relevant codes.