单层倒悬链型叉筒网壳静力与稳定性研究  

Research on Static Properties and Stability of Single-layer Intersected Inverted Catenary Cylindrical Reticulated Shell

作　　者：贺拥军[1] 钟欣[1] 周绪红[2] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]重庆大学土木工程学院,重庆400044

出　　处：《湖南大学学报（自然科学版）》2016年第3期41-47,共7页Journal of Hunan University:Natural Sciences

基　　金：教育部博士学科点专项科研基金资助项目(0161110019);湖南省高校科技创新团队资助计划项目(湘财教指(2012)80号)

摘　　要：针对以倒悬链线作为交叉柱面准线的单层倒悬链型叉筒网壳,对其常见网格形式结构的静力与稳定性进行比较,得到了结构最佳网格形式.在此基础上,将单层倒悬链型叉筒网壳与圆弧型叉筒网壳进行了静力性能与稳定承载力对比,研究了倒悬链型叉筒网壳的稳定性,包括屈曲模态及杆件截面尺寸、结构几何缺陷、荷载不对称分布与支座约束形式等对结构极限承载力的影响.结果表明,单层倒悬链型叉筒网壳三角形网格形式结构性能最佳;该结构相比圆弧型叉筒网壳具有明显的优越性;初始缺陷对结构稳定性影响较为显著,计算时应考虑1/300跨度的初始缺陷峰值;结构对不对称荷载作用较为敏感;矢跨比为0.50时,网壳的稳定性最好,为最优矢跨比.For the single-layer intersected inverted catenary cylindrical reticulated shell, the static proprties and stability of the structures with different types of grid were studied and compared, and then the optimal grid form was obtained. The static properties and stability of the single layer intersected inverted eatenary cylindrical reticulated shell were compared with those of the intersected circular cylindrical reticu- lated shell. Moreover, the stability of the former was studied comprehensively, including the buckling modes and the effect of various parameters such as the member sectional area, initial geometric imperfec- tion, asymmetric load distribution, and support conditions on the ultimate load-carrying capacity. The re- suits show that the structural performance of the single-layer intersected inverted catenary cylindrical retic- ulated shell with triangular grids is markedly superior to shell is sensitive to initial geometric imperfection, l/a00 the circular one. Because, this kind of reticulated of the structural span should be considered as the initial geometric imperfection value in the calculation of the ultimate load-carrying capacity. Additionally, the reticulated shell is also quite sensitive to the asymmetric load distribution, and the optimal value of rise-span ratio is 0.50 for shell stability.

关 键 词：单层倒悬链型叉筒网壳 静力性能 稳定性 极限荷载 

分 类 号：TU356[建筑科学—结构工程]