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树状结构是一种具有形态统一特征的新型空间结构形式,特别适用于展览馆、航站楼等大型公共建筑中。以黑龙江省新博物馆自然展区树状结构为例,详细介绍该结构的形态创建过程,通过对单柱方案和六柱方案的比较分析,获得了具有良好建筑效果且受力合理的空间结构形式;对该树状结构进行非线性全过程分析,考察结构的失稳模式,指出对于这种复杂空间刚架体系,整体稳定性分析应同时考虑几何非线性和材料非线性;探讨构件计算长度系数的确定方法,指出树状结构的杆件计算长度系数无法参照规范规定,而应通过对整体模型中的杆件失稳模态分析确定;最后,采用基于整体模型的屈曲分析方法给出各级分枝的计算长度系数取值建议。
The tree structure is a new type of space structure with uniform features of shape and shape, especially suitable for large public buildings such as exhibition halls and terminal buildings. Taking the tree structure of the New Museum of Heilongjiang Province as an example, this paper introduces in detail the morphological creation process of this structure. By comparing and analyzing the single-column solution and the six-post solution, the spatial structure form with good building effect and reasonable force is obtained. The whole structure of the tree structure is analyzed nonlinearly and the instability mode of the structure is investigated. It is pointed out that for such a complex space rigid frame system, the overall stability analysis should consider both the geometrical nonlinearity and the material nonlinearity. It is pointed out that the calculation of the length coefficient of the tree-shaped bar can not be referred to the specification, but should be determined through the analysis of the instability mode of the bar in the whole model. Finally, the buckling analysis method based on the whole model The calculation of the branch length coefficient is recommended.