前言在一般结构力学中,由于结构变形小,其对内力的影响可以略去不计。但在某些体系,例如大跨度的拱和悬索桥,这种影响可能很大,这就应该按所谓挠度理论(或二阶理论)进行计算。在《桥梁建设》1973年第5期“黄河某单跨加劲式公路悬索桥设计简介”一文中介绍了一种按挠度理论计算悬索桥的方法,从计算过程可以看出,按挠度理论计算需要经过多次试算才能得到正 Preface In general structural mechanics, due to structural deformation is small, its impact on internal forces can be ignored. However, in some systems, such as long-span arches and suspension bridges, this effect can be significant and should be calculated in terms of so-called deflection theory (or second order theory). In the “bridge construction” in 1973 the fifth period “Yellow River single-suspension stiffening highway suspension bridge design” article introduced a method according to deflection theory to calculate the suspension bridge can be seen from the calculation process, according to the calculation of deflection theory need to go through more Try to get positive test