基于荷载传递函数法的单桩抗拔承载力计算方法研究  

Research of Bearing Capacity Computing Method of Tension Pile Based on Load Transfer Method

作　　者：张绍斌 童华炜[1] 陈建平 袁志强 

机构地区：[1]广州大学土木工程学院,广州510006 [2]中建铁投轨道交通建设有限公司,广州510032

出　　处：《广州建筑》2017年第6期21-26,共6页GUANGZHOU ARCHITECTURE

基　　金：广东省自然科学基金(2014A030310498;2017A030313293)

摘　　要：采用荷载传递函数法,推导考虑桩身自重的抗拔桩的基本微分方程,建立荷载增量与变形增量的迭代关系。根据位移协调法,给出了荷载-位移加载曲线的计算步骤。通过与实际工程中试桩的实测结果进行对比,表明计算结果相对偏小,总体吻合情况良好,说明了该方法计算抗拔桩的可行性。此外,对桩身的设计参数进一步作了参数分析,考察承载力的变化规律。结果表明,当桩体满足承载力要求时,改变桩身的配筋率和混凝土强度对桩体的抗拔承载力影响不大,桩长和桩径是抗拔承载力主控因素。The load transmission function method is used to deduce the differential equation and iteration relation between the increment of load and deformation of tension piles considering self-weight of pile body. The calculation steps of the load-displacement curve are given according to the displacement compatibility equations. By comparing the analytically calculated result with that of a test pile in a real project, it is shown that the calculated result is relatively conservative and matches well with measured data, which indicates the feasibility of the load transmission function method for tension pile calculation. In addition, a parametric analysis of pile body is presented to investigate the characteristics of bearing capacity fluctuation. The results show that the reinforcement ratio and concrete strength have negligible effects on the bearing capacity of uplift pile when the pile is satisfied with the requirement of bearing capacity. Pile length and diameter are principal factors to the uplift capacity of the piles.

关 键 词：荷载传递函数法 抗拔桩 自重 

分 类 号：TU473.11[建筑科学—结构工程]