【摘要】 空间焊接相贯节点受力复杂,对大尺寸、多平面支管及空间多向加载作用下相贯节点的承载力设计方法,目前相关的设计规范并未给出详细规定。因此,有必要针对焊接钢管相贯节点在空间多向加载作用下的性能进行分析。以山西省太原南站为工程背景,选取其屋盖结构——伞形空间钢桁架下弦节点为研究对象,采用ABAQUS对其进行有限元分析,计算了节点在空间多向加载作用下的应力、变形分布,并重点探讨节点相贯区域内不同加劲构造措施对节点强度和刚度的影响。分析结果表明:支管与主管相贯区域为节点受力最不利位置,尤以受拉支管与主管汇交处最为明显;圆形截面支管屈服先于矩形截面支管;相对于"井字形加劲肋"构造,"横隔板+纵向加劲肋"构造有效提高节点承载能力,但在纵向加劲肋与横隔板相交处,存在局部塑性变形。更多还原

【Abstract】 The forces that the spatial welded steel tubular joints bear are complicated,and there is no design code for the load carrying capacity of large scale welded steel tubular joints as well as branch pipes in the multiple planes and under the multi-direction spatial loading. Therefore,it is necessary to analyze the performance of welded steel tubular joints under multi-direction spatial loading. Considering the bottom chord in the umbrella-shaped roof structure of the South Railway Station of Taiyuan,‘the ten major constructions in Shanxi Province’,the distribution of stress and deformation of the joints under multi-direction spatial loading were calculated using the finite element analysis software ABAQUS,and the strength and the stiffness of the joints influenced by different stiffener arrangement in the intersecting area of the joints were discussed. The results indicate that the intersecting area between the branch duct and main duct is the most unfavorable position of the joints,especially in the area between main duct and pull tube; that the circular branch yields before the rectangular branch; that the structure reinforced by ‘diaphragm combined with longitudinal ribs’ has a higher load carrying capacity than that reinforced by ‘well-shaped ribs’,but there are local plastic deformation in the intersecting area.更多还原