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直接刚度法,对支承条件有“先处理法”和“后处理法”。对杆系结构的铰结点,需要建立许多单元刚度矩阵。在程序中要输入不同结点性质信息。因此,本文提出用“虚链杆代换的方法,在结构简图上“先处理非刚性结点”。使10种以上的单元刚度矩阵减少到两种,使6种以上的梁式杆减少到1种,使非结点荷载的相关性减少到6与1之比。
Direct stiffness method, the support conditions are “first processing method” and “post-processing method.” For the hinge point of the bar structure, many element stiffness matrices need to be established. In the program to enter the nature of different nodes information. Therefore, in this paper, the method of “virtual chain rod substitution” is used to “handle non-rigid nodes first in the structure diagram”, so that more than 10 kinds of element stiffness matrices can be reduced to two, and more than 6 kinds of beam rods can be reduced To 1, reducing the correlation of non-nodal loads to a ratio of 6 to 1.