论文部分内容阅读
某研究机构科研楼采用折板式网格与网架组合而成的空间结构,外形类似钻石体。该结构从中部开始往下内收,仅底部周边有柱脚支承,内部无支撑,约束较少,空间关系复杂,整体稳定性问题突出。利用ANSYS软件进行特征值屈曲分析,确定结构的初始几何缺陷分布,进而进行结构的非线性屈曲分析;研究了节点刚度、结构关键部位对整体稳定性能的影响;通过特征值屈曲分析反算了结构主要杆件的计算长度系数。分析结果表明:该钻石体折板式网格结构为对初始缺陷不敏感结构;在D+L工况下,考虑几何、材料双重非线性时,结构的临界荷载系数约为2.45,满足规程要求;节点的刚度对结构的稳定性影响较小;关键部位失效后,也不会发生结构的整体倒塌,证明了折板式网格是一种稳定性较好的空间结构形式。
A research institutes research institutes using folded plate grid and grid combination of space structure, shaped like a diamond body. The structure starts from the middle down adduction, only the bottom periphery of the column foot support, internal no support, less constraints, spatial relationship is complex, the overall stability issues outstanding. The eigenvalue buckling analysis is carried out by ANSYS software to determine the initial geometric defect distribution of the structure, and then the nonlinear buckling analysis of the structure is carried out. The influence of the joint stiffness and the key parts of the structure on the overall stability is studied. The eigenvalue buckling analysis The main rod of the calculation of length coefficient. The results show that the diamond plate folded grid structure is insensitive to the initial defect. Under the condition of D + L, considering the geometrical and material nonlinearity, the critical load coefficient of the structure is about 2.45, which meets the requirements of the procedure. The stiffness of the node has little effect on the stability of the structure. After the failure of the key part, the overall collapse of the structure will not occur, which proves that the folded-plate grid is a kind of stable space structure.