所谓影响线法,即单位荷载在框架梁上的移动,对断面内力的影响。设想在欲求其弯矩影响线i处解除约束(设置铰),应用互易定理,并使该处全部角变(θ_L-θ_R)=1,则有: M_i=-y (1) 此时梁的变位曲线,即为M_i处的影响线,见图1。已知框架梁的端转角θ_L、θ_R时 The so-called influence line method, that is, the movement of the unit load on the frame beam, influences the internal force of the section. Imagine that if you want to remove the constraint (setting the hinge) at the moment of influence line i, and apply the reciprocity theorem and make all the angle changes (θ_L-θ_R)=1, then there are: M_i=-y (1) The displacement curve is the influence line at M_i, see Figure 1. When the end angles θ_L, θ_R of the frame beam are known