摘要
针对正交异性钢桥面板顶板-U肋焊接接头突出的疲劳问题,以广东虎门二桥坭洲水道桥为例,基于国际焊接协会推荐的热点应力法,利用ANSYS有限元软件建立的参数化热点应力精细有限元分析模型,对顶板-U肋焊接接头热点应力受顶板厚度、熔透率、组装间隙等参数的影响进行了精细有限元分析,结果表明:顶板厚度由16 mm增加到18 mm,顶板焊趾、焊根热点应力降低约26%、28%;顶板厚度由16 mm减小到14 mm,顶板焊趾、焊根热点应力增加约38%、96%;肋板厚度由8 mm增加到10 mm,肋板焊趾、焊根热点应力降低约20%,而顶板焊趾、焊根热点应力略有增加;熔透率由60%增加到100%(全熔透),肋板焊趾、焊根热点应力降低约10%;熔透率为30%时,组装间隙由0.5 mm增加到3.5 mm,肋板焊趾、焊根热点应力增加约9%;焊趾高度由8 mm增加到10 mm或角度由40°变为30°,顶板焊趾热点应力降低约4%或11%。最后,结合一种新兴的U肋内焊技术,即将传统的顶板-U肋单面焊接接头发展为双面焊接头,通过扩展上述参数化热点应力精细有限元分析模型,对采用U肋内焊技术后的顶板-U肋焊接接头热点应力的变化及受熔透率、内焊趾高度、内焊趾角度等参数的影响进行了精细有限元分析,以为今后U肋内焊技术在正交异性钢桥面板结构的工程应用提供一些合理化建议。
Aiming at the outstanding fatigue problem of deckplate-U-rib weld joints in orthotropic steel bridge decks,taking the Nizhou Channel Bridge of Guangdong Humen 2 nd Bridge for example,based on the hot spot stress method recommended by International Institute of Welding,using the parametric hot spot stress fine FE model built by finite element software ANSYS,the refined finite element analysis of hot spot stresses of deckplate-U-rib weld joints influenced by thickness of deckplate,penetration rate and assembly gap is carried out. The result shows that(1) the hot spot stresses of weld toe and weld root of deckplate could be decreased approximately by 26 % and 28 % with deckplate thickness increased from 16 mm to 18 mm;(2)the hot spot stresses of weld toe and weld root of deckplate could be increased approximately by 38 % and96 % with deckplate thickness increased from 16 mm to 14 mm;(3) the hot spot stresses of weld toe and weld root of rib could be decreased approximately by 26 % with rid thickness increased from 8 mm to 10 mm,while the hot spot stresses of weld toe and weld root of deckplate could be increased slightly;(3) the hot spot stress of weld toe and weld root of rib could be decreased approximately by 10 % with penetration rate increased from 60 % to 100 %(full-penetration);(4) the hot spot stresses of weld toe and weld root for rib could be increased approximately by 9 % with assembly gap increased from 0. 5 mm to 3. 5 mm when penetration rate is 30 %;(5) the hot spot stresses of weld toe for deckplate could be decreased approximately by 4 % or 11 % respectively with height of weld toe increased from 8 mm to 10 mm or angle of weld toe increased from 40 ° to 30 °. Finally,based on an emerging technology of U-rib internal welding,by which the traditional one-sided weld joint of deckplate-U-rib could be developed into a double-sided welded joint,extending the above parametric hot spot stress fine FE model,the refined FE analysis of varied hot spot stress of deckplate-U-rib weld
作者
凌立鹏
唐亮
LING Li-peng;TANG Liang(CCCC Highway Bridges National Engineering Research Centre Co. Ltd. , Beijing 100088, China;CCCC Highway Consultants Co. , Ltd. , Beijing 100088, China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2018年第4期58-66,共9页
Journal of Highway and Transportation Research and Development
基金
交通运输部建设科技项目(2015 318 J41 270)
关键词
桥梁工程
疲劳性能
热点应力
钢桥面板
U肋内焊
顶板-U肋
有限元
bridge engineering
fatigue performance
hot spot stress
orthotropic steel bridge deck
U -ribinternal welding
deckplate-U-rib
finite element