不同雪荷载分布形式下弦支穹顶结构稳定性研究

Stability studies of cable-suspended dome under snow load of different distribution forms

雪荷载分布形式对弦支穹顶结构的稳定性有重要影响。本研究分析了凯威特型弦支网壳结构在不同雪荷载分布下的非线性稳定性能,结构在最不利雪荷载布置下失稳变形过程和失稳前后撑杆及预应力索的应力变化过程。研究表明结构在雪荷载沿半跨非均匀分布时的稳定承载力最小;结构失稳过程中,随着荷载的增加,索与撑杆构件的预应力逐渐减小,到达失稳点后失稳点对应的撑杆变为倾斜状态。

The distribution of snow load has an important influence on the stability of cable-suspended dome structure.The non-linear stability bearing capacity of Kiewitt cable-suspended dome structure is investigated under snow load of different distribution forms.Instability deformation process of structures is analyzed under the most unfavorable load arrangement.Stress variation of braces and cables are also analyzed.The results show that:when the snow load is non-uniformly distributed along the half-span,the structure has the smallest stability bearing capacity.In the process of structural instability,with the increase of load,the pre-stress of cable and brace members decreases gradually,and the brace becomes oblique after reaching the instability point.