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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。
In order to improve the accuracy and efficiency of single-pile design and calculation of horizontal load, a finite element numerical solution of the rod system based on the principle of composite stiffness and two-parameter method is established. At the same time, from the theory and the analysis of the static load test example, the paper points out the defects of the m method of the horizontal load pile proposed by our current norm, and suggests the improvement method. In this paper, the finite element method of the finite element method does not have the limitation of the parameter value as the analytical method, which avoids cumbersome lookup of the table and does not need to assume the pile-end constraint and distinguish the long pile, the short pile and the long pile. The example comparison shows that the finite element solution of the finite element method is in good agreement with the analytic solution when using the same comprehensive stiffness and two parameters as the analytic method, which can ensure the displacement and corner of pile top, the maximum bending moment of pile and its action position And the measured results are basically the same. When the proportion coefficient m of each soil layer is determined according to the change of soil layers within the pile length, better calculation results than the analytical method can be obtained by adjusting the power exponent n and the comprehensive stiffness EI through several trial calculations.