拱坝应力分析的曲杆单元法

The Method of Curved Bar Units for the Analysis of Arch Dam Stresses

曲杆单元法将拱坝分离成空间刚架结构,将曲杆作为计算基本单元。通过单元及荷载分析,得出结构的总体刚度方程,并提出了求解应力的方法。计算考虑了影响拱坝结构作用的各种主要因素,包括五个结点位移分量。地基变形按F.vot方法计算,并用对角元叠加法进行支座处理。同时考虑了温度变形及泊桑比的影响。计算程序对计算机内存数量要求不高,文中给出了计算实例,并与现在使用的程序的计算结果进行了对比、分析。

In the method of curved bar units, a arch dam is seperated into space rigid framed structures and curved bars are taken as the basic units of calculation. Through the analysis of units and loads, the general stiffness equaltion has been obtained and the calculating method of stresses is also recommanded. In calculation, the varieties of main factors including 5 seperate displacements, which have influence on the structural action of a arch dam are considered. The foundation deformation is calculated by F.vogt method, and the supports are treated by method of superposition of diagonal elements. At the same time, the temperature deformation and Poissons ratio are also considered. The high capacity of a computer is not required when the computing program is running. In the paper there is a practical example of the calculation, in which the computing results of the present program and previous programs are compared.