为了探讨綦江虹桥垮塌的原因,通过对现有结构计算分析程序功能的分析,论述了对压弯杆件最不利受力状态分析时的遗漏和针对压弯杆件强度及稳定验算方法中存在的错误；质疑是否存在哑铃形或圆端矩形断面的拱肋抗弯截面模数的计算方法，指出了钢管混凝土拱桥存在诸多不安全因素；建议设计工程师放弃片面追求新、奇的设计思想,转变为注重安全、耐用、适用来设计和建造百年之内决不会垮塌的工程。

The paper discusses the omission in analyzing the worst stressed state and the mistake in strength and stability checking computations method for compression and bending member, by analyzing the available construction calculation analysis program function, in order to approach the reason of Qijiang arch bridge breakdown. Especially the paper queries whether there exists the bend section modular calculating method for dumbbell or round end rectangular section arch rib, to prove the existence of a lot of unsafe factors in the steel pipe-concrete arched bridge. Finally the paper recommends, the designer to change the idea of unilaterally chasing new and strange into the principle of safe, durable and useful,so as to design and build the structure that will never break down for a century.