援巴布亚新几内亚国际会议中心玻璃采光顶整体稳定性和节点应力分析

援巴布亚新几内亚国际会议中心玻璃采光顶为圆形,跨度32m,结构为内外钢环与连系钢梁组成的空间结构。此结构受力特点类似扁壳,存在整体稳定性问题。文章利用有限元软件ABAQUS对其做了整体稳定性分析,对承受复杂应力的连接节点做了应力状态分析。分析结果表明:结构第二阶失稳模态为可能失稳模态其对应的线性屈曲特征值为8.67;全跨活荷布置下最大缺陷为跨度1/300的缺陷结构的失稳加载系数为4.0,其为线性特征值的46%。结构整体稳定承载力对初始缺陷不敏感。节点应力分析得到连接节点的材料处于弹性状态,节点是安全的。

Overall Stability and Node Stress Analysis of Central Glass Skylight of China-Aided Papua New Guinea International Conference Centre

The round central glass skylight is an important part of the China-aided Papua New Guinea international conference center. It is mainly composed of two steel rings and fifteen steel beams and spans 32 m. The spatial structure reflects the mechanical characteristics of shallow shell. Therefore, the overall stability should be studied. This paper studies the space overall stability and typical node stress state with the finite element software ABAQUS. The results show that： the second order buckling mode is the most probable for the structure buckling and its linear buckling eigenvaluc is 8.57; the nonlinear buckling eigenvalue is 4.0 for the structure buckling with the initial imperfections of 1/300 span and live load covered. It is 45% of the linear buckling eigenvalue. The overall structural stability is not sensitive to initial imperfections. The material is elastic and the typical node is safe from the node stress analysis.