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竖向简谐荷载下高承台单桩的动力压屈稳定性

, PP. 52-57

Keywords: 桥梁工程,桩基础,m法,Hamilton原理,动力稳定性

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Abstract:

为探讨动力荷载作用下桩身的压屈稳定性,以m法考虑桩周土的横向抗力,利用能量法和Hamilton原理,基于桩顶自由、桩端嵌固边界条件下的高承台单桩基础动力稳定分析模型,建立了竖向简谐荷载下桩身动力稳定的Mathieu方程。采用三角级数求解,获得了基桩的动力不稳定区域。由此进行的参数对比分析表明,随桩土体系中桩身长径比的增加、埋置率的减小、自由长度的增加及桩周土质越趋软弱,桩身动力不稳定区域将增大,而固定荷载P0的影响则较小,这一影响规律与工程实际吻合较好。

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