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厚街体育馆钢屋盖采用大跨度椭圆抛物面弦支穹顶结构,支座间净跨110m×80m,上部单层网壳矢高9.4 m.分别以此结构与相应的单层网壳为分析对象,采用改进的随机缺陷模态法,对两类结构的缺陷敏感区域进行对比研究.在此基础上,进一步探讨局部拓扑形式改变及活载半跨分布对弦支穹顶结构缺陷敏感区域的影响.研究表明:弦支穹顶结构的缺陷敏感区域位于上部单层网壳;弦支穹顶与相应单层网壳的缺陷敏感区域有较大差异,下部索杆体系的引入明显改善了上部单层网壳的缺陷敏感性;局部拓扑形式的改变,可有效降低结构的缺陷敏感程度;活载的半跨分布对传统拓扑形式弦支穹顶结构缺陷敏感区域的影响并不大,但对于该结构上部单层网壳中心区域的影响较为显著.
The steel roof of Houjie Gymnasium adopts the long-span elliptic paraboloid suspen-dome structure, with a net span of 110m × 80m and an upper single-layer reticulated shell with a height of 9.4 m. Based on this structure and the corresponding single-layer reticulated shell, Improved stochastic defect modal method to contrast the sensitive areas of the two types of structures.On this basis, the further study is to investigate the influence of the change of local topological forms and the distribution of live half-span on the sensitive area of the substructure defect : The suspicious area of the suspen-dome structure is located in the upper monolayer reticulated shell. The suspen-dome has a big difference with the sensitive area of the corresponding single-layer reticulated shell. The introduction of the lower cable system obviously improves the defects of the upper monolayer reticulated shell Sensitivity. The local topological changes can effectively reduce the sensitivity of structural defects. The semi-span distribution of live load has little effect on the sensitive area of the traditional topological suspen-dome structure defect. However, for the upper monolayer reticulated shell The influence of the central area is more significant.