不对称及非均匀雪荷载下单层球面网壳结构的稳定性研究

发布时间：2018-10-08 14:12

【摘要】：不对称非均匀雪荷载对单层球面网壳结构的稳定性有重要影响.基于非线性有限元分析理论,研究了K8型单层球面网壳结构在雪荷载下的非线性稳定性能,分析中不仅考虑了雪荷载在网壳结构投影面上分布区域的不对称性,同时考虑了雪荷载沿网壳结构径向分布厚度的非均匀性.在分布区域上分别考察了在雪荷载全跨、半跨、半跨最外两环3种情况,在分布厚度上分别考察了雪荷载均匀、非均匀2种情况.结合定量计算和概念分析,确定了网壳结构雪荷载的最不利分布状态.分析结果表明,单层球面网壳在雪荷载沿半跨最外两环非均匀分布时的稳定承载力最小,较雪荷载在全跨均匀分布、全跨非均匀分布时的稳定承载力分别下降36.4%和9.6%.基于此,建议我国现行《空间网格结构技术规程》在球面网壳稳定性验算时考虑雪荷载分布的不对称性和非均匀性.
[Abstract]:Asymmetric nonuniform snow loads have an important effect on the stability of single-layer spherical reticulated shells. Based on the theory of nonlinear finite element analysis, the nonlinear stability of K8 single-layer spherical reticulated shell structure under snow load is studied. The asymmetry of the distribution of snow load on the projection plane of reticulated shell structure is not only considered in the analysis. At the same time, the inhomogeneity of the thickness distribution of snow load along the radial distribution of the reticulated shell structure is considered. In the distributed region, three cases of the outermost two rings of snow load are investigated, and two cases of uniform and non-uniform snow load are investigated in the distributed thickness. Combined with quantitative calculation and conceptual analysis, the most unfavorable state of snow load distribution of reticulated shell structure is determined. The results show that the stable bearing capacity of single-layer spherical reticulated shell is the smallest when the snow load is distributed inhomogeneously along the outermost two rings of half span, and the stable bearing capacity of single-layer spherical reticulated shell decreases by 36.4% and 9.6% respectively when the snow load is distributed uniformly in the whole span. Based on this, it is suggested that the present Technical Specification for Spatial Grid structures in China take into account the asymmetry and non-uniformity of snow load distribution when checking the stability of spherical latticed shells.
【作者单位】：河北农业大学城乡建设学院;中国石油集团工程设计有限责任公司华北分公司;
【基金】：建设部科学技术计划项目(2015-K2-028) 河北省科技计划重点基础研究项目(15965401D) 河北省教育厅青年基金项目(QN2015047) 河北农业大学理工基金项目(LG201628;LG201626)
【分类号】：TU399

【相似文献】