考虑剪切变形影响的桩基m法计算理论

发布时间：2018-07-17 15:43

【摘要】：考虑桩基的剪切变形影响,利用单广义位移深梁理论,建立了桩基m法的计算方法,导出了水平位移、转角、弯矩和剪力的初参数表达式和无量纲参数函数的统一表达式,根据桩底边界条件建立了初参数解的计算公式;给出了无量纲参数函数随换算深度和弯剪刚度比的变化图形。研究表明,换算深度小于3.0时,弯剪刚度比对无量纲参数函数影响较小,换算深度大于4.0时,弯剪刚度比对无量纲参数函数影响的趋势非常明显,桩基剪切变形的影响程度与桩的边界条件有关。算例结果表明,桩身的剪切变形有增大桩顶水平位移、提高弯矩零点位置、改变弯矩分布特征、扩大桩侧土压力大小等影响。
[Abstract]:Considering the effect of shear deformation on pile foundation, the calculation method of m method for pile foundation is established by using the theory of single generalized displacement deep beam. The expressions of initial parameters of horizontal displacement, rotation angle, moment and shear force and the dimensionless parametric function are derived. According to the boundary condition of pile bottom, the calculation formula of initial parameter solution is established, and the graph of dimensionless parameter function changing with conversion depth and bending shear stiffness ratio is given. The results show that when the conversion depth is less than 3.0, the effect of bending shear stiffness ratio on dimensionless parametric function is smaller than that of non-dimensional shear stiffness ratio, and when the conversion depth is greater than 4.0, the effect of bending shear stiffness ratio on dimensionless parametric function is very obvious. The influence of shear deformation of pile foundation is related to the boundary condition of pile. The results show that the shear deformation of the pile body has the effects of increasing the horizontal displacement of the pile top, increasing the position of the moment zero, changing the distribution characteristics of the moment and expanding the soil pressure on the side of the pile.
【作者单位】：长沙理工大学土木与建筑学院;
【基金】：国家自然科学基金(51278072) 湖南交通科技创新项目(201452)~~
【分类号】：TU473.1

【相似文献】