钢箱梁横隔板-U肋疲劳裂纹钢板加固参数分析  

Parameters Analysis of Steel Plate Reinforcement for Fatigue Crack of Diaphragm U-rib Welded Joint in Steel Box Girder

作　　者：沈翔 吉伯海[2] 肖龙 陈欣 高天 SHEN Xiang;JI Bo-hai;XIAO Long;CHEN Xin;GAO Tian(Ningbo Hangzhou Bay Bridge Development Co.,Ltd.,Ningbo 315000,China;Civil Engineering and Transportation College,Hohai University,Nanjing 210000,China;Jiangsu Ningjingyan Expressway Co.,Ltd.,Taizhou 225300,China)

机构地区：[1]宁波市杭州湾大桥发展有限公司,宁波315000 [2]河海大学土木与交通学院,南京210000 [3]江苏宁靖盐高速公路有限公司,泰州225300

出　　处：《科学技术与工程》2022年第34期15245-15251,共7页Science Technology and Engineering

基　　金：国家重点研发计划政府间重点专项(2017YFE0128700)。

摘　　要：通过建立带疲劳裂纹的钢箱梁横隔板-U肋局部有限元模型,分析钢板加固机理。通过提取连接焊缝焊趾应力评价受损构件钢板加固效果。通过提取胶层应力分析钢板加固后的胶层破坏模式,提取裂纹尖端应力强度因子用于研究钢板加固效果。通过设置多种工况,研究加固件面积、形状、厚度等参数对于加固效果的影响。研究表明:钢板加固可显著改善横隔板-U肋焊缝应力水平。钢板可有效贴合疲劳裂纹,加固作用体现为代替受损截面参与构件协同受力。钢板加固面积对于加固效果影响较大,沿横隔板与U肋连接焊缝方向延长加固件,可提升加固效果。短裂纹加固时适当增加板厚。设置十字形加劲肋加固效果劣于等效增加板厚。The local finite element model of diaphragm U-rib welded joint with fatigue cracks was established to analyze the steel plate reinforcement mechanism.The steel plate reinforcement effect of damaged components was evaluated by extracting the stress at weld toe.The failure mode of the adhesive layer after steel plate reinforcement was analyzed through its stress.The stress intensity factor at the crack tip was also extracted to analyze the reinforcement effect.By setting a variety of working conditions,the influence of reinforcement area,shape,thickness and other parameters on the reinforcement effect was explored.The results demonstrate that the stress level of the diaphragm U-rib weld can be significantly improved by steel plate reinforcement.The steel plate can be effectively bonded to the fatigue crack,and the reinforcement effect is reflected in replacing the damaged section to participate in the collaborative working of the component.The reinforcement area of steel plate has great influence on the reinforcement effect.The reinforcement effect can be improved by extending the length of steel plate along the connection weld between diaphragm and U-rib.When short cracks are reinforced,the thickness of the steel plate shall be appropriately increased.The reinforcement effect of setting cross stiffeners is inferior to that of equivalently increasing the thickness of the steel plate.

关 键 词：钢箱梁 横隔板-U肋焊缝 疲劳裂纹 钢板加固 加固参数 

分 类 号：TU393.3[建筑科学—结构工程]