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本文采用弹性加肋板模型应用能量原理研究了斜拉桥主梁的纵向稳定问题。众所周知,在历史上,桥梁几次毁于失稳的事实教训,不能不引起我们对斜拉桥稳定问题的关注和重视。本文在导出了计算临界压力公式之后,接着举了个算例,详细地介绍了整个问题的计算过程和所得公式的具体应用。并且比较了分别由弹性加肋板和杆件得到的临界压力的数值。本文还指出了公式Pcr=2(EIC~(1/2))的来历及其适用条件,并结合本文算例评价了任意推广该公式估算斜拉桥的临界压力所存在的问题。
In this paper, the elastic principle of the ribbed plate is applied to study the longitudinal stability of the main girder of the cable-stayed bridge. As we all know, in history, the fact that the bridge was destroyed several times by instability can not but cause our attention and attention to the stability of cable-stayed bridges. After deriving the formula to calculate the critical pressure, the paper gives an example to illustrate the calculation process of the whole problem and the concrete application of the formula. The values of the critical pressures obtained from the elastic ribs and rods are also compared. The paper also points out the origin of the formula Pcr = 2 (EIC ~ (1/2)) and its application conditions, and evaluates the existing problems of estimating the critical pressure of the cable-stayed bridge by any extension of this formula.