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在计算等截面结构弯曲变形时常用图乘法,但对变截面结构则用变梁常数较简捷。变梁常数有形常数和载常数之分。以单位力矩M=1作用于简支梁的一端,梁端发生的角变形称形常数,如图1中a_(ab)、a_(ba)和β_(ab)。a之注脚为梁端编号,第一个注号a或b表示单位力矩M和角变形都是位于同一个梁端a或b。图1a和图1b之β相等,都用β_(ab)表示。对于等截面梁荷载使梁端发生的角变形称载常数,见图2之θ_(ab)和θ_(ba)。θ之注脚为梁端编号,第一个注脚a或b表示θ所在之梁端a或b。
In the calculation of the bending deformation of the equal section structure, the graph multiplication is commonly used, but for the variable section structure, the variable beam constant is simpler. Variable beam constant tangent constants and load constants. The unit moment M = 1 acts on one end of the simply-supported beam, and the angle deformation of the beam end occurs as a shape constant, such as a_(ab), a_(ba), and β_(ab) in Fig. 1 . The footnote of a is the number of the end of the beam, and the first notation a or b indicates that the unit moment M and angular distortion are all located at the same beam end a or b. The β in Figures 1a and 1b are equal and both are represented by β_(ab). For the constant beam load, the angle deformation of the beam ends is called load constant, see θ_(ab) and θ_(ba) in Fig. 2 . The footnote of θ is the number of the beam end, and the first footnote a or b represents the beam end a or b where θ is located.