考虑强弱轴影响的矩形钢管网壳结构弹塑性稳定性分析  

Elastic-Plastic Stability Analysis of Rectangular Hollow Section Latticed Shells Considering Influence of Strong and Weak Axis

作　　者：马胜玲 张莉[1] MA Shenging;ZHANG Li(School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学力学与工程科学学院,上海200444

出　　处：《结构工程师》2024年第2期23-32,共10页Structural Engineers

摘　　要：在单层网壳结构中,存在强弱轴的矩形钢管较圆钢管、方形钢管在结构受力合理性、材料性能充分利用上存在优势。首先通过一组算例对比分析了圆钢管、H型钢、方形钢管和矩形钢管四种杆件形式在网壳结构曲面内外承受双向压弯的稳定性差异,随后将矩形钢管带入装配式节点的弹簧单元有限元模型,对比刚接模型进行研究,得到了节点域、节点刚度、初始缺陷幅值、矢跨比等参数对结构稳定承载力的影响规律。结果表明,矩形钢管的稳定应力在两个方向上可以达到平衡,且在强轴方向的稳定应力要低于同截面面积的圆钢管和方形钢管的稳定应力;对于截面存在强、弱轴且在截面两个方向材料充分运用的杆件,其弱轴方向抗弯刚度的影响不可忽视。In single-layer reticulated shell structures,rectangular steel tubes have advantages over circular and square steel tubes in terms of structural rationality and the utilization of material properties due to the presence of strong and weak axis.Firstly,the stability of four shell surfaces under internal and external biaxial compression bending is compared and analysed.These four shell surfaces are composed of four types of steel tubes independently,which are circular steel tubes,H-shaped tubes,square steel tubes,and rectangular steel tubes.Then,the rectangular steel tube is used into the finite element model of the spring element of the prefabricated joint,and compared with the rigid joint model to study the influence of parameters such as the effects of joint region,joint stiffness,initial defect amplitude,and span-to-depth ratio on the stable bearing capacity of the structure.The results show that the stable stress of the rectangular steel tubes can be balanced in both directions,and the stable stress in the strong axis direction is lower than that of circular and square steel tubes with the same cross-sectional area.For members with strong and weak axes in the cross-section and full utilization of materials in both directions,the influence of the flexural stiffness in the weak axis direction cannot be ignored.

关 键 词：单层网壳结构 矩形钢管 装配式节点 弹塑性稳定性能 精细化数值模型 

分 类 号：TU392.3[建筑科学—结构工程]