一、前言在我国水利水电建设中,拱坝日见增多。拱坝的应力分析比较复杂,对于比较薄的拱坝,按壳体理论计算是解决的途径之一。在文献中曾经给出了按经典壳体理论计算拱坝的基本方程。按经典理论计算拱坝,存在着两方面的困难。第一是根据不同的假定,可得到不同的基本方程,而目前还没有得到一致公认的比较满意的基本方程,第二是方程比较复杂,无法得到分析解答,只能用差分法求解,而用差分法求解时,边界条件的处理比较麻烦。因此近年来已很少采用这种方法,而倾向于采用有限单 I. Introduction In our country’s water conservancy and hydropower construction, arch dam daily increase. The stress analysis of arch dam is more complicated. For the thinner arch dam, calculating by shell theory is one of the solutions. In the literature, the basic equations for calculating arch dam according to classical shell theory have been given. According to the classical theory of arch dam, there are two difficulties. The first is based on different assumptions, can get different basic equations, but has not been universally accepted by the more satisfied with the basic equation, the second is more complex equations can not be analyzed and solved, only the difference method to solve, and use Difference method to solve the boundary conditions of the treatment more trouble. Therefore, this method has rarely been adopted in recent years and tends to adopt limited orders