索撑双向网格型单层柱面网壳稳定性研究

双向网格型单层柱面网壳结构不仅外型美观、各构件布置规则，而且质量轻、采光好。但是随着网壳跨度越来越大，整体稳定性问题也日益突出，因此制约了此类网壳结构在实际工程中的应用。为此，针对双向网格型单层柱面网壳结构，提出了一种新型布索方案，即在双向网格面内布置斜拉索提高结构的面内刚度，在双向网格面外通过撑杆布置横、纵拉索提高结构的面外刚度。首先通过对不同跨度网壳结构的弹塑性分析验证拉索的布置效果，并考虑各种参数变化对结构稳定性的影响，论证了此类网壳结构的合理性和实用性。其次，结合模型的静力试验研究了此类索撑柱面网壳结构的稳定性，论证了拉索布置的合理性。结果表明，采用撑杆和拉索的交错布置后，网壳结构的受力更加合理，其承载能力有了大幅度提高。此类索撑网壳结构为缺陷不敏感结构，但是撑杆长度对结构承载能力的影响很大，对于不同跨度的网壳结构，撑杆的最佳长度有所不同，实际工程中要确保撑杆具有最佳长度。

Study on stability of cable supported single-layer two-way grid cylindrical shell

Two-way grid single-layer cylindrical reticulated shells are not only beautiful in appearance and regular in arrangement of components,but also light-weighted and efficient in lighting. However,as the span of reticulated shells becomes larger and larger,the problem of overall stability becomes more prominent,which restricts the application of such reticulated shell structures in practical projects. In this paper,a new type of cable stiffened two-way grid singlelayer cylindrical shell was proposed,where diagonal cables were arranged inside the two-way grid surface to improve the in-plane stiffness of the structure,and the out-of-plane cables were arranged to improve the out-of-plane stiffness of the structure. Firstly,the effect of cable arrangement was verified by elasto-plastic stability analysis of reticulated shells with different spans and the rationality and practicability of this kind of reticulated shell were demonstrated by considering the effect of various parameters on the structural stability. Secondly,the stability of the cable supported cylindrical reticulated shell structure was investigated by theoretical and experimental studies,and the rationality of cable arrangement was demonstrated. The results show that the stress of reticulated shell structure is more reasonably distributed and its bearing capacity is greatly improved after adopting the staggered arrangement of struts and cables.This kind of structure is not sensitive to defects,but the length of strut has great effect on the bearing capacity of the structure,so the best length of the strut should be ensured in practical engineering.