H型钢厚腹板工艺孔延迟裂纹原因分析  

Analysis of Delayed Welding Cracks of Fabrication Holes in Thick Web of H-section Steel

作　　者：曾骥 叶国新 孔繁荣 冯杰 韩云鹏 ZENG Ji;YE Guoxin;KONG Fanrong;FENG Jie;HAN Yunpeng(China Construction Steel Structure Co.,Ltd.,Shenzhen ,Guangdong518000,China)

机构地区：[1]中建钢构有限公司,广东深圳518000

出　　处：《施工技术》2018年第22期101-103,共3页Construction Technology

摘　　要：某国际机场钢结构工程采用英标S355钢材,存在大量H型钢对接焊缝,腹板厚60～140mm,在现场磁粉探伤过程中发现了厚腹板位置的工艺孔延迟冷裂纹。裂纹位于焊接热影响区,起始于工艺孔中部位置。基于现场工程实例及试验研究,分析裂纹成因,指出厚钢板焊接的高拘束度、工艺孔导致的应力集中是造成裂纹的主要因素,并针对性地提出解决办法。At an international airport construction project using British Standard S355steel,there are a large number of H-section butt joint welding,witch web plate thickness from 60mm to 140mm.Cold cracks are found on the cope hole of the web plate when MPI inspection is done in site.Cracks in the welding heat affected zone begin in the center of cope hole.Based on the site practice and experimental study,causes of cracks are analyzed and the main reason is the high restrain and stress concentration in cope hole,also the corresponding solutions are put forward.

关 键 词：钢结构 焊接 延迟冷裂纹 腹板 扩散氢含量 约束度 

分 类 号：TU758.11[建筑科学—建筑技术科学]