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本文应用求解二维轴向扭转波动方程的类特征线法,计算圆形刚性埋置基础的扭转振动;介绍了以这一方法为基础而编制的计算程序CHARFOUND,这是计算圆形刚性基础扭转振动的通用程序。 应用这一程序计算了几种情况下的基础扭转问题。对于弹性半空间上埋置基础的静力扭转问题,本文计算结果与弹性力学数值解的结果十分吻合。通过这两个结果的分析比较,认为CHARFOUND程序计算结果的精度是较高的。分析表明,对于埋深比大于0.3的埋置基础,不必需要过密的节点网就能得到具有一定精度的结果。通过三种不同地基条件下一个模型基础的计算,说明地基土的非线性以及基础与地基接触面的滑移,对基础的动态反应以及地基中的应力、应变和位移都有重大影响。计算结果与现场模型基础实测资料的比较表明,为了取得较为符合实际的结果,在承受较大动荷载的埋置基础的动态反应计算分析中,考虑地基土的非线性和基础侧表面可能发生的相对滑移是十分必要的。
In this paper, the torsional vibration of a circular rigid embedded foundation is calculated by the method of class-feature method for solving the two-dimensional axial torsional wave equation. The calculation program CHARFOUND based on this method is introduced, which is to calculate the circular rigid foundation torsion. General procedure for vibration. This procedure was used to calculate the basic torsion in several cases. For the static torsion problem of embedded foundation on elastic half-space, the results of this paper are in good agreement with the numerical results of elastic mechanics. Through the analysis and comparison of these two results, it is considered that the accuracy of the CHARFOUND program calculation results is high. The analysis shows that for a buried foundation with a depth ratio greater than 0.3, it is not necessary to have a dense network of nodes to obtain a result with a certain degree of accuracy. The calculation of a model foundation under three different ground conditions shows that the nonlinearity of the foundation soil and the slip of the contact surface between the foundation and the foundation have a significant influence on the dynamic response of the foundation and the stress, strain and displacement in the foundation. The comparison between the calculated results and the actual measured data of the on-site model shows that in order to obtain more practical results, the nonlinearity of the foundation soil and the possible occurrence of the base-side surface may be considered in the calculation of the dynamic response of the buried foundation subjected to large dynamic loads. Relative slip is necessary.