水平荷载单桩计算的综合刚度和双参数法杆系有限元数值解

发布时间：2018-12-11 19:24

【摘要】：为提高水平荷载单桩设计计算的准确度和效率,建立基于综合刚度和双参数法原理的杆系有限元数值解。同时,从理论和对静载试验实例的分析上,指出我国现行规范建议的水平荷载桩设计计算m法存在的缺陷,建议改进方法。本文建立的杆系有限元法不像解析法那样存在参数取值的限制,避免了烦琐的查表计算,且无需对桩端约束条件进行假定及区分长桩、短桩和中长桩。实例计算比较表明,当采用与解析法相同的综合刚度和双参数时,杆系有限元解与解析解结果吻合很好,能保证桩顶位移和转角、桩身最大弯矩和及其作用位置与实测结果基本一致;当根据桩长范围内土层变化确定各土层比例系数m,通过若干次试算调整幂指数n和综合刚度EI可获得较解析法更好的计算结果。
[Abstract]:In order to improve the accuracy and efficiency of the design and calculation of single pile under horizontal load, a finite element numerical solution of bar system based on the principle of comprehensive stiffness and two-parameter method is established. At the same time, based on the analysis of theory and examples of static load test, this paper points out the defects of m method in the design and calculation of horizontal load pile, which is suggested in the current code of our country, and suggests to improve the method. The finite element method of the bar system established in this paper does not have the limitation of parameter selection as the analytical method, and avoids the cumbersome table checking calculation, and does not need to assume and distinguish the long pile, the short pile and the medium length pile with the constraint conditions at the end of the pile. The calculation results show that the results of finite element method and analytical solution are in good agreement with the analytical solution, and the displacement and rotation angle of the pile top can be guaranteed when the composite stiffness and double parameters are the same as the analytical method. The maximum bending moment sum and its action position of the pile body are in good agreement with the measured results. When the ratio coefficient of each soil layer is determined according to the variation of soil layer in the range of pile length, the better results can be obtained by adjusting the power exponent n and the comprehensive stiffness EI through several trial calculations.
【作者单位】：福州大学岩土工程研究所;卧龙岗大学土木采矿和环境工程学院;福建省交通规划设计院;
【基金】：福建省交通厅资助项目(20130002)~~
【分类号】：TU473.1

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