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(-)计算精度 1.分载位移法在形成整体协调方程过程中,没有设置整体坐标,没有对内力,分载,位移进行坐标变换。通常拱是水平布置的,梁轴线不是竖直的,在结点上两者法线方向不重合。因此,在同一点,拱梁的位移必须转换在相同坐标上才相等;分载也必须转换在相同的座标上,才有两者之和等于外荷载。当梁元轴线取直线时,整条梁轴呈折线形,梁元的内力,分载,位移必须先转换成相同的座标系上,才能建立梁的平衡条件,否则必然带来相当的误差。而杆元分载法是进行了上述坐标变换的。
(-) Calculation Accuracy 1. In the course of forming the overall coordination equation, the load-displacement method does not set the overall coordinates, and does not coordinate transformation of internal forces, load, displacement. Usually the arches are horizontally arranged, the beam axis is not vertical, and the normal directions of the two are not coincident at the nodes. Therefore, at the same point, the displacements of the arches and beams must be converted to be equal on the same coordinates; the load sharing must also be converted on the same coordinates, so that the sum of the two is equal to the external load. When the axis of the beam and beam is taken as a straight line, the entire beam axis is in the form of a broken line. The internal forces, load and displacement of the beam element must first be converted into the same coordinate system in order to establish the equilibrium condition of the beam. Otherwise, it will inevitably bring about considerable errors. . The rod element decentralization method performs the above coordinate transformation.