X型双肋拱系的侧倾屈曲

LATERAL BUCKLING OF X-TYPE TWIN RIBBED ARCH BRACED WITH TRANSVERSE BEAMS

本文研究了X型双肋烘系在径向荷载作用下的侧倾屈曲问题,提出了供肋间距的扩展系数和拱系在侧倾屈曲过程中的变形协调关系,利用最小势能原理推导了两端铰接的X型双肋拱系的侧倾屈曲临界荷载表达式;通过对临界荷载系数λ_c? 的各参数分析比较,可供拱系结构优化设计参考;理论分析与实验结果和电算结果比较表明:本文提出的临界荷载q_(cr)表达式具有足够的精确性,使用简捷方便。

In this paper, the lateral elastic buckling problem of a circular arch spacesystem, composed of X-type double main arch ribs with hinged ends and transversebracing beams, loaded by uniformly distributed radial force are investigated.The spreading coefficient of arch rib and the space deformation compatibilityrelations of arch system in lateral buckling are studied. By use of the principleof the minimum potential energy, the critical buckling load q_(cr) is obtained. Inanalysing each parameter of the critical buckling coefficient λ_(cr), attention isgiven to the optimization of the design of arch system structure. Comparison ofthe theoretical analysis with the results obtained from experiments and compu-ters shows that the critical buckling load q_c, given in this paper might besimply used in design practice with sufficient accuracy.