考虑竖向荷载影响的大直径管桩水平振动响应解析解

发布时间：2018-10-20 16:41

【摘要】：建立了黏弹性地基中受轴力作用的现浇大直径管桩水平振动响应计算模型,通过引入势函数对土体振动方程进行解耦,结合桩土耦合条件求得了桩顶复阻抗解析表达式。将该解退化到不考虑竖向荷载的水平振动响应解与已有理论解对比,验证了该解的合理性。通过算例分析,研究了竖向荷载、激振频率和桩长对管桩桩顶水平复阻抗、桩身位移和内力的影响,研究结果表明:复阻抗实部和虚部在桩土系统固有频率处均发生共振;竖向荷载使管桩位移和内力发生重分布,竖向荷载为零时,位移、弯矩和剪力最大值均出现于管桩中上部,随着竖向荷载增大,其最大值均出现于桩底;桩身水平位移随频率变化而变化,管桩中下部转角、弯矩和剪力受频率影响较大;桩身中下部位移和内力受桩长影响大于桩身其他部分;无桩芯土时桩顶水平位移和转角比桩芯土存在时大。
[Abstract]:A calculation model of horizontal vibration response of cast-in-situ large-diameter pipe pile under axial force in viscoelastic foundation is established. The vibration equation of soil is decoupled by introducing potential function, and the analytical expression of complex impedance of pile top is obtained by combining the coupling condition of pile and soil. The proposed solution is reduced to a horizontal vibration response solution which does not take into account vertical load and is compared with the existing theoretical solution. The rationality of the solution is verified. The effects of vertical load, exciting frequency and pile length on the horizontal complex impedance, displacement and internal force of the pile are studied. The results show that the real and imaginary parts of the complex impedance resonate at the natural frequency of the pile-soil system. The vertical load redistributes the displacement and internal force of the pile. The vertical load is 00:00, the maximum of displacement, bending moment and shear force appears in the middle and upper part of the pipe pile, and the maximum value appears at the bottom of the pile with the increase of vertical load. The horizontal displacement of the pile body varies with the frequency, and the angle, bending moment and shear force of the middle and lower part of the pile are greatly affected by the frequency, and the displacement and internal force of the middle and lower part of the pile are influenced more by the length of the pile than the other parts of the pile body. The horizontal displacement and rotation angle of the top of the pile with no core soil are larger than that of the pile core soil.
【作者单位】：山地城镇建设与新技术教育部重点实验室(重庆大学);河海大学土木与交通学院;
【基金】：国家自然科学基金项目(51378177,51622803,51420105013)
【分类号】：TU473.1

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