纵横弯曲桩计算的综合刚度和双参数法的有限差分解

发布时间：2018-03-19 00:24

本文选题：桩基工程　切入点：纵横弯曲桩　出处：《岩石力学与工程学报》2016年03期 　论文类型：期刊论文

【摘要】：为提高外露段较长的桩在横向和竖向荷载共同作用下变形和内力的计算精度和效率,基于综合刚度原理和双参数法推导可考虑桩的纵横弯曲,即计及竖向荷载(包括桩顶竖向力及桩身自重和桩侧摩阻力)对弯曲变形影响的有限差分解,采用MATLAB程序语言编制相应的计算程序。与模型试验数据或现有方法工程实例计算结果的比较验证了该法的可靠性,同时还表明该方法比基于相同原理的杆系有限元法更方便快捷。研究结果表明:对于外露长度和桩顶竖向荷载较大的桩,重力二阶效应是不容忽视的,且竖向荷载不仅会增大桩身弯矩,还会导致桩身剪力的增大,现有方法未体现其对剪力的影响,是偏于不安全的,在纵横弯曲桩的设计计算中应引起重视。
[Abstract]:In order to improve the accuracy and efficiency of calculating the deformation and internal force of long exposed piles under the combined action of transverse and vertical loads, the longitudinal and transverse bending of piles can be considered based on the principle of comprehensive stiffness and the method of two parameters. Taking into account the finite difference decomposition of the effects of vertical loads (including the vertical force on the top of the pile, the weight of the pile body and the friction on the side of the pile) on the bending deformation, The MATLAB program language is used to compile the corresponding calculation program. The reliability of the method is verified by comparison with the model test data or the calculation results of existing engineering examples. It is also shown that the method is more convenient and faster than the finite element method based on the same principle. The results show that the second-order gravity effect can not be ignored for piles with large exposed length and vertical load on the top of the pile. The vertical load will not only increase the bending moment of the pile body, but also lead to the increase of the shear force of the pile body. The existing methods do not reflect the influence of the shear force on the shear force, so it is not safe and should be paid more attention to in the design and calculation of the longitudinal and horizontal bending pile.
【作者单位】：福州大学岩土工程研究所;卧龙岗大学土木采矿与环境工程学院;
【分类号】：TU473.1

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