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试载法是目前一种比较常用的拱坝应力分析方法。本文介绍的是利用有限元概念来改进多拱梁体系的一种计算方法。首先,用弹性中心法给出变截面及等截面拱单元刚度矩阵的显式;然后用弹性中心法给出变截面及扭曲梁单元的刚度矩阵,并采用组合刚度法建立整体平衡方程,使方程组带宽及存储量大为减少,以致在微机上即可用多拱梁法计算拱坝应力。同时,还提出了计算扭曲梁的方法。利用本文推导的公式而编制的计算拱坝应力的ADAS程序,具有较强的功能和较高的效率。可以计算单心圆、多心圆、抛物线、双曲线、椭圆、对数、螺旋线、单曲、双曲、等厚,变厚等各种类型的拱坝应力。大量计算结果表明,本文方法具有良好的计算精度。
Test method is currently a more commonly used stress analysis of arch dam. This paper presents a method to improve the multi-arch system by using the concept of finite element. First, the elastic center method is used to give the explicit formulas of the stiffness matrix of the variable cross-section and the equivalent cross-section arch elements. Then, the stiffness matrix of the variable cross-section and the torsion beam elements is given by the elastic center method, and the global equilibrium equation is established by using the combined stiffness method. Group bandwidth and storage capacity greatly reduced, so that the computer can be used to calculate the arch arch multi-arch stress. At the same time, a method of calculating the torsion beam is proposed. The ADAS program to calculate the arch dam stress using the formulas deduced in this paper has strong function and high efficiency. Can calculate single heart circle, multi-heart circle, parabola, hyperbolic, elliptical, logarithmic, spiral, single, hyperbolic, thick, thick and other types of arch dam stress. A large number of calculation results show that this method has a good calculation accuracy.