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一、概述为分析斜桥,已经研究过各种单元。例如现行斜桥设计通用程序中,采用的是位移函数为不完全三次多项式的三角形单元,它是一个非完全协调单元,采用位移法分析薄板时,一个困难的问题是如何使相邻单元间的位移协调。早先我们曾作过完全五次多项式的完全协调三角形单元,在每个节点选定节点参数为挠度 w,斜率 w_x,w_y 及曲率、扭率 w_(xx)、w_(xy)、w_(yy)。虽然它有很多优点,但因未知数太多,就目前的一般计算机而言,容量和机时都成问题。再则,高阶节点
I. Overview For the analysis of inclined bridges, various units have been studied. For example, in the general program of the current design of the inclined bridge, the triangular unit whose displacement function is an incomplete cubic polynomial is adopted. It is an incomplete coordination unit. When using the displacement method to analyze the thin plate, a difficult problem is how to make the adjacent units Displacement coordination. Earlier we had completely complete triangular polynomial polynomial units. The node parameters of each node were selected as deflection w, slope w_x, w_y, curvature, w_ (xx), w_ (xy), w_ (yy) . Although it has many advantages, but due to unknowns too much, in the current general computer, capacity and machine time are a problem. Then, high-order nodes