蜂窝网格型球面网壳的非线性稳定性研究

发布时间：2018-05-10 04:44

本文选题：单层蜂窝型球面网壳 + 稳定性　；参考：《湖南大学学报(自然科学版)》2016年11期

【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比分析,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40m,矢跨比取0.25左右,杆件长度取2m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.
[Abstract]:The nonlinear stability of single-layer honeycomb reticulated spherical shell is studied by finite element software ANSYS. Firstly, the stability performance of two kinds of honeycomb reticulated spherical shells is compared and analyzed, and a reasonable grid layout is determined. Then, the effects of span, rise-span ratio, mesh size, initial defects, load asymmetry distribution and material nonlinearity on the stability of latticed shells are analyzed. It is found that the overall stability of the mesh type I is better in the spherical reticulated shells with two types of honeycomb meshes, and it is suggested that the span should not be larger than 40m, the ratio of rise-to-span is 0.25, the length of the members is about 2m, and the overall stability of the latticed shells is better. The effect of material nonlinearity on the stability bearing capacity of single-layer honeycomb reticulated spherical shell is significant. Considering the material nonlinearity, the stable bearing capacity of reticulated shell decreases to 50%, and the reticulated shell is very sensitive to the initial defects. The theoretical maximum defect value is 1 / 150 of the span, and the ultimate bearing capacity of the latticed shell decreases by about 52%, and the latticed shell structure is not sensitive to the asymmetric distribution of load.
【作者单位】：湖南大学土木工程学院;
【基金】：国家重点研发计划资助项目(2016YFC0701200,2016YFC0701201) 湖南省高校科技创新团队滚动计划资助项目(湘财教指(2015)616号)
【分类号】：TU399

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