原创《蜂窝网格型球面网壳非线性稳定性》：本论文为免费优秀的关于网壳论文范文资料，可用于相关论文写作参考。
摘 要：针对单层蜂窝网格型球面网壳利用有限元软件ANSYS对其进行了非线性稳定性研究.首先对两类蜂窝网格型球面网壳的稳定性能进行对 析,确定了一种比较合理的网格布置形式.然后进行参数分析,分析了跨度、矢跨比、网格大小、初始缺陷、荷载不对称分布和材料非线性对网壳稳定性的影响.研究发现：在两类蜂窝网格形式的球面网壳中,网格Ⅰ型的整体稳定性能更好；分析建议其跨度不宜大于40 m,矢跨比取0.25左右,杆件长度取2 m左右,此时网壳整体稳定性较好,材料利用率较高；材料非线性对单层蜂窝网格型球面网壳的稳定承载力影响显著,考虑材料非线性后,网壳稳定承载力下降达50%；网壳对初始缺陷非常敏感,其理论最大缺陷值为跨度的1/150,此时网壳极限承载力最大下降达52%左右；网壳结构对荷载不对称分布不敏感.
关键词：单层蜂窝型球面网壳；稳定性；极限承载力；非线性分析
中图分类号：TU393.3文献标识码：ANonlinear Stability Analysis of Singlelayer
Honeycomb Spherical Latticed Shells
HE Yongjun,PENG Zhengqun
（ College of Civil Engineering, Hunan Univ, Changsha, Hunan410082, China）Abstract：The finite element software ANSYS was used to investigate the nonlinear stability of singlelayer spherical latticed shells with hexagonal connection form. Firstly, a reasonable grid layout was determined by analyzing and comparing the stability of two types of honeycomb spherical latticed shells. A large scale parametric analysis was then carried out, including the influences of the span, raisespan ratios, grid size, initial geometric imperfection, asymmetric load distribution, and material nonlinearity on the stability behavior of honeycomb spherical latticed shells. The results show that the grid of typeⅠexhibits better overall stability capacity for two kinds of grid configurations of singlelayer honeycomb spherical latticed shells. It is also suggested that the span should not exceed 40 m. The overall stability of the net shell is better and material utilization is higher, when the rise to span ratio is close to 0.25 and the bar length is about 2 meters. Meanwhile, the material nonlinearity has a great effect on the stability of the bearing capacity for singlelayer honeycomb spherical latticed shells, and the bearing capacity of latticed shells is decreased by 50%. However, the critical load of latticed shells is reduced by 52% when the initial defects reach 1/150 of the span. Moreover, it is found that the reticulated shells are not sensitive to the asymmetric loads.
Key words：singlelayer honeycomb spherical latticed shells； stability property； critical load； nonlinear analysis
球面網壳是现代空间网壳结构应用非常广泛的一种结构形式,相对于双层球面网壳而言,单层球面网壳的总自由度约束大大减小,因而其刚度较弱,稳定性问题显得非常突出.近年来,国内外学者对三向网格型、肋环型、凯威特型等球面网壳的非线性稳定性的研究已比较成熟[1-5].
文献[6]建立了六边形网格球面网壳的参数化模型,但其杆件长度存在一定的差别,且不符合模数,不利于批量化生产.为解决此问题,本文从模型上做了大量的改进,使其杆件长度模数化：在球面坐标系下,采用等弧找点的办法（即利用已知点和弧长,再由结构对称性求得未知点）,在六分之一的对称扇形区域里从网壳的顶点开始逐个生成节点.通过这样的建模使得结构中的杆件长度（除和支座相连的杆件）完全相等,等长的杆件提高了工业化生产的效率,为施工也带来了极大的便利,同时形成了优美的六边形蜂窝网格结构,提高了观赏价值,具有很好的研究意义.
网壳论文参考资料：
结论：蜂窝网格型球面网壳非线性稳定性为大学硕士与本科网壳毕业论文开题报告范文和相关优秀学术职称论文参考文献资料下载，关于免费教你怎么写网壳结构读音方面论文范文。
