桩身压屈稳定性分析

桩的压屈稳定性受到桩周土体约束等多种因素的影响．理论分析表明，桩身压屈临界荷载比Euler公式计算结果高出一增量，并且计算长度越长的桩，这一增量越大；当桩长达到某一界限长度时，桩身压屈临界荷载达到最小值不再随桩长增大而减小．进一步分析表明，桩身初始弯曲将降低桩身压屈稳定承载力，而桩周摩阻力的存在使得桩身压屈稳定承载力有所提高。

Analysis of Pressing-Yield-Atability of Pile

There are many factors, such as the restriction of the soil around the pile, affecting pressing - yield - stability of the pile. It proved by theoretical analysis that comparing the result calculated by Euler formula, the critical load of the pile under pressing increased a little, and, the longer the pile was, the more the increment was. When the length of pile extended a boundary, the critical load of the pile under pressing would reach the minimum instead of failing with the length of the pile increasing. It proves by more analysis that the initial curve will depress the critical load of the pile under pressing, while, the frictional resistance around pile will increase it.