Abstract: In this paper, the authors investigate the lateral elastic buckling problem of a circular arch space system Composed of X-type double main arrh ribs with hinged or fixed ends and transverse bracing beams, loaded by uniformly distributed radial force. Employing the principle of the minimun potential energy, the analytic formulas of Critical buckling load qcr are obtained. Theoretical and numerical analyses show that the critical burkling load formulas given by this paper might be simply and conveniently used in design practice with Sufficient accuracy.

Key words: Rib arch, Large span, Lateral stability

摘要： 本文研究了X型双肋拱系在径向荷载作用下的弹性屈曲问题,利用最小势能原理推导了具有不同支承条件的拱系侧倾屈曲临界荷载的解析表达式,理论分析和计算表明:本文提出的临界荷载表达式具有足够的精度,使用简捷方便。

关键词: 肋拱, 大跨径, 侧向稳定性