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以刚度矩阵法计算影响线,一般是令P=1在结构上移动,形成荷载矩阵,解方程先求得位移再计算内力或反力。本文介绍另一方法,其要点是:根据功的互等定理,用挠度曲线表示影响线,以单刚相应的列,作为结构荷载向量的元素,便可由方程直接解得该挠度曲线纵座标。它对杆系、板壳及三维结构均适用,优点是程序简明,能节省存贮量,缩短机时。另外还提供了统一处理同一结构部位不同支承条件的方法。
The stiffness matrix method to calculate the impact line, the general is to make P = 1 in the structure to move to form the load matrix, the equation to find the displacement and then calculate the internal force or reaction force. This article introduces another method, the main points are: According to the reciprocal theorem of work, the deflection curve is used to represent the influence line, and the corresponding column is used as the element of the structural load vector to directly solve the vertical coordinate of the deflection curve . It applies to the rod system, the plate shell and the three-dimensional structure. The advantage is that the program is concise, the storage capacity can be saved and the machine time can be shortened. It also provides a unified approach to deal with the same structural parts of different support conditions.