摘要
H型钢栓焊拼接节点具有优良的拼装性能,广泛应用于钢结构建筑。但在施工过程中,这种节点常有错边、气孔、夹渣等焊接缺陷,不满足验收规范的要求,也严重影响结构安全。为保证结构安全使用,有必要研究带缺陷H型钢栓焊拼接节点承载力的精确评估方法及受限空间内的加固技术。根据焊缝缺陷程度进行定量分级,提出一种利用缺陷焊缝的有效部分、螺栓摩擦力和缺陷焊缝的抗压能力进行节点剩余承载力精确评估的方法;对5种常用梁型、带不同程度焊缝缺陷的节点进行评估,给出了各节点承载力评估结果。基于评估结果,提出了受限空间内将H型变为III型截面的H型栓焊拼接节点抗弯加固方法。
H-shaped steel bolted welded joints have excellent welding performance and are widely used in steel buildings. However, during the construction, the joints often show welding defects such as misalignment, air holes, and slag inclusion, which do not meet the requirements of acceptance specifications and seriously affect structural safety. In order to ensure the safe use of structures, it is necessary to study the method for accurately evaluating the bearing capacity and the reinforcement technology in a confined space of the defective H-shaped steel bolted welded joints. In this paper, defective welds were quantitatively classified into different levels, and a method for accurately evaluating the residual bearing capacity of joints by using the effective part of the defective welds, bolt friction, and compressive capacity of the defective welds was proposed. In addition, joints of five commonly used beams with different defective welds were evaluated, and the evaluation results of the bearing capacity of each joint were given. According to the evaluation results, a bending reinforcement method of H-shaped bolted welded joints was proposed, which changed H-shaped structures into III-shaped sections in a confined space. The research results can provide a reference for the identification and reinforcement of defective H-shaped steel bolted welded, as well as the revision of reinforcement codes of steel structure joints in China.
作者
吴晨煊
幸坤涛
李胜林
冯绍攀
WU Chenxuan;XING Kuntao;LI Shenglin;FENG Shaopan(China University of Mining and Technology,Beijing 100083,China;Inspection and Certification Co.,Ltd.,MCC,Beijing 100088,China)
出处
《工业建筑》
CSCD
北大核心
2022年第10期176-181,194,共7页
Industrial Construction
关键词
H型钢栓焊拼接节点
焊缝缺陷
剩余承载力评估
节点加固
H-shaped steel bolt welded joint
defective welds
evaluation of residual bearing capacity
joint reinforcement
