Static Behavior Analysis of Hinged Six-Bar Tetrahedral Spherical Lattice Shell
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摘要: 为了简化半刚接半铰接六杆四面体球面网壳的节点形式,提出两种新型的由投影面为圆环形的铰接六杆四面体构成的球形网壳构造。对两种铰接六杆四面体构成的球形网壳构造进行了静力和特征值屈曲分析及非线性稳定性分析,结果显示:上弦径向杆沿跨度方向布置且支撑位于下弦和下弦径向杆沿跨度方向布置且支撑位于上弦的六杆四面体球形网壳结构通过线性特征值屈曲分析和考虑几何初始缺陷、荷载不对称布置的稳定性分析,均能够得到较好的力学性能。此种网壳结构的构型非常简洁,节点和杆件数量相比于双层球形网壳构造较小,且网格抽空率高,同时具备了单层和双层球形网壳构造的主要优势。铰接六杆四面体所构成的球形网壳能够通过螺栓球连接,便于标准化设计、工业化生产和装配化施工,符合绿色工程的特征。
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关键词:
- 铰接六杆四面体球面网壳 /
- 特征值屈曲分析 /
- 几何非线性 /
- 材料非线性
Abstract: In order to simplify joint form of semi rigid and semi hinged six-bar tetrahedral spherical lattice shell, this paper presents two new types of hinged six-bar tetrahedral spherical lattice shell with a circular ring projection surface. The new shell configuration was simple because of comparatively fewer members and high evacuation ratio than double-layer spherical lattice shell structure. Six-bar tetrahedral spherical lattice shell has advantages of both single-layer and double-layer spherical lattice shell structure. Static and linear and nonlinear stability analyses of shell with two new types of hinged six-bar tetrahedral spherical lattice shell were carried out. Through the linear eigenvalue buckling analysis, stability analysis considering load asymmetry distribution and geometrical initial defects, the results show that the six-barred tetrahedral spherical reticulated shell structure with the lower chord support of the upper chord arranged along the span direction and the upper chord support of the lower chord arranged along the span direction are good in integral rigidity, mechanical property, stability. The hinged six-bar tetrahedral spherical lattice shell with bolted spherical joints is beneficial to standardized design, industrial production and assembly construction, which meets the characteristics of green architecture industry. -
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