中文摘要：

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.

英文摘要：

Asymmetrical and non-uniform snow loads have an important influence on the stability of singlelayer latticed shell structures.Based on the theory of nonlinear finite element,stability bearing capacity of Kiewitt-8single-layer latticed shells under snow loads are investigated in this paper.The influence of asymmetrical snow area distribution on the projection surface on the shell,and non-uniformity of snow thickness distribution along the radial direction of the shell are considered.Three cases in the distribution area,including the snow across the full-span,across the half-span,and across two outer rings in the halfspan are investigated.Meanwhile,the distribution thickness of snow on uniform and non-uniform are investigated respectively.With combination of quantitative calculation and conceptual analysis,the most dangerous snow distribution on latticed dome can be determined.Stability analysis results show that,when snow is across two outer rings in the half-span and non-uniformly distributed,the stability bearing capacity of the latticed dome is lowest,which decreased 36.4% and 9.6%respectively compared with the capacity under the snow across full-span on uniform and non-uniform.Based on the result,it is recommended that asymmetrical and non-uniform distribution of snow loads should be considered for thecurrent specification for space frame structures,when examining the stability of latticed domes.