考虑基桩差异性及桩土共同工作的桩基承台梁内力分析

传统承台梁计算方法采用倒置的连续梁进行简化计算，未能考虑基桩承载力差异对承台梁内力的影响及梁下土体对荷载的分担作用，同时也难以模拟梁下土体的连续性及应力一应变的扩散。引入荷载传递法计算基桩刚度，提出一种对基底反力能进行自动调整的梁底反力计算方法，并结合Newnlark计算原理，给出了能考虑基桩承载力差异、梁身截面变化及梁下地基土体塑性变形的承台梁内力分析方法。最后，结合某工程实例，对各种计算方法进行了分析比较，结果表明本文方法更符合桩基承台梁的实际受力状况。

Inner force analysis of pile capping beam considering stiffness variance of pile and pile-soil interaction

The traditional calculation method of pile capping beam is inverted consecutive beam method which cannot reflect the influence of pile stiffness variance and the partaking of soil, and can’t simulate sequence of soil under beam and diffusion of stress-strain. Firstly, load transferring method is used to calculate stiffness of pile; and an auto-adjustment method that can adjust counter pressure of beam bottom is put forward; then combining the Newmark calculation principle, an inner-force analysis method is deduced which considering pile bearing capacity variance and pile shaft section variance and soil plastic deformation. Finally, the comparative calculation was done with the data from an engineering instance, the calculation result shows that the new method introduced is coincide well with actual status.