覆板和加劲板加强的Q460C方钢管有间隙N型节点力学性能研究
PDF下载 (104)汪锦林,初汉增,赵东平,王万祯.覆板和加劲板加强的Q460C方钢管有间隙N型节点力学性能研究[J].宁波大学学报(理工版),2025,38(1):63-72.DOI:10.20098/j.cnki.1001-5132.2023.1108
WANG Jinlin,CHU Hanzeng,ZHAO Dongping,WANG Wanzhen.Mechanical properties of gap N-joints of Q460C steel square tube strengthened with cover plates and stiffening ribs[J].Journal of Ningbo University(Natural Science & Engineering Edition),2025,38(1):63-72.DOI:10.20098/j.cnki.1001-5132.2023.1108
| Title: | Mechanical properties of gap N-joints of Q460C steel square tube strengthened with cover plates and stiffening ribs |
| 作者: | 汪锦林, 初汉增, 赵东平, 王万祯 |
| Author(s): | WANG Jinlin, CHU Hanzeng, ZHAO Dongping, WANG Wanzhen |
| 关键词: | Q460C方钢管; 有间隙N型节点; 覆板; 加劲板; 承载力; 破坏模式 |
| Keywords: | Q460C steel square tube; gap N-joint; cover plate; stiffening rib; bearing capacity; failure mode |
| 分类号: | TU391 |
| DOI: | 10.20098/j.cnki.1001-5132.2023.1108 |
| 文献标识码: | A |
| 摘要: | 为考察覆板和加劲板加强构造对Q460C方钢管有间隙N型节点的破坏模式、荷载—位移曲线、极限承载力、热点应变和应力分布等受力性能影响, 对加强节点和基本节点进行了主管轴压静力加载试验和基于椭球面断裂模型的数值模拟与破坏机制分析. 试验和数值模拟结果表明, 基本节点的破坏模式为主管上翼缘受拉鼓曲开裂, 与受拉支管相连的主管壁凸起; 加强节点破坏模式为加劲板屈曲和覆板焊缝受拉开裂. 覆板和加劲板加强构造使节点区应力分布更均匀, 降低了节点区焊缝断裂风险; 增加覆板厚度明显减小了主管上翼缘变形, 提高了节点的极限承载力. 加强节点的极限承载力较基本节点提高了9.4%~36.5%, 破坏位移减小了16.5%~25.2%, 转角减小了57.5%~72.0%. |
| Abstract: | In order to investigate the effects of cover plates and stiffening ribs on the failure mode, load-displacement curve, ultimate bearing capacity, as well as distribution of hot spot strain and stress of the gap N-joints of Q460C steel square tube, both static test with axial compression on the chord and numerical simulation and failure mechanism analysis based on an ellipsoid fracture model were carried out on the basic joint and the strengthened joints. The results show that the failure modes of the basic joint include the buckling of the upper flange of the chord, the cracking of the bottom flange of the chord, and the bulge of the chord walls connected to the branch under tension, while those of the strengthened joints include the buckling of the stiffened ribs and the cracking of the welds between the cover plate and the chord. The distribution of stress in the connected zone is more uniform due to the cover plate and the stiffening ribs, and this increases the ultimate bearing capacity and reduces the deformation of N-joints. Compared with those of the basic joint, the ultimate bearing capacity of the strengthened joints increases by 9.4%-36.5%, the displacement at failure reduces by 16.5%-25.2%, and the rotation angle reduces by 57.5%-72.0%. |
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| 备注/Memo: | 收稿日期: 2023−11−04. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 浙江省公益技术应用研究项目（LGF18E080007）. 第一作者: 汪锦林, 硕士研究生, 主要研究方向: 钢结构和组合结构. E-mail: 17369966025@163.com *通信作者: 初汉增, 讲师, 主要研究方向: 钢结构断裂与疲劳. E-mail: chuhanzeng@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
