车轮位置对钢桥面板U肋对接焊缝的影响范围分析
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摘要
通过建立正交异性钢桥面板局部有限元模型,计算车轮荷载下U肋对接焊缝的主应力,提取各测点最不利横向位置下的纵向应力分布,得到纵向影响范围.基于各测点随荷载横向位置变化的应力,得到各测点的荷载横向影响范围,对比单轮单次荷载作用下的损伤度获得U肋对接焊缝的易损部位.结果表明:车轮荷载位置对U肋对接焊缝的纵向影响范围约2个横隔板间距;U肋对接焊缝靠近顶板部位横向影响范围约为900 mm,其他部位影响范围约为600 mm,可忽略"多车效应";U肋对接焊缝靠近顶板位置为U肋对接焊缝中的易损部位.
The local finite element model of orthotropic steel bridge deck is established. The principal stress of U-rib butt welds under single wheel is calculated. The longitudinal influence scope is obtained by the longitudinal stress distribution of measuring points under the most unfavorable transverse position. The transverse influence scope is obtained by the variation of stress amplitude with the change in transverse position. The vulnerable position of U-rib butt welds is determined by comparing the damage degree of four measuring points under a single loading of a single wheel. The results show that the longitudinal influence scope is about the distance between two diaphragms. The transverse influence scope of the position close to the deck is about 900 mm and others are about 600 mm, thus the multiple vehicles effect could be ignored. The position close to the deck is the most unfavorable in U-rib butt weld.
The local finite element model of orthotropic steel bridge deck is established. The principal stress of U-rib butt welds under single wheel is calculated. The longitudinal influence scope is obtained by the longitudinal stress distribution of measuring points under the most unfavorable transverse position. The transverse influence scope is obtained by the variation of stress amplitude with the change in transverse position. The vulnerable position of U-rib butt welds is determined by comparing the damage degree of four measuring points under a single loading of a single wheel. The results show that the longitudinal influence scope is about the distance between two diaphragms. The transverse influence scope of the position close to the deck is about 900 mm and others are about 600 mm, thus the multiple vehicles effect could be ignored. The position close to the deck is the most unfavorable in U-rib butt weld.
引文
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[2]PFEIL M S,BATTISTA R C,MERGULH珟AO A J R.Stress concentration in steel bridge orthotropic decks[J].Journal of Constructional Steel Research,2005,61(8):1172-1184.DOI:10.016/j.jcsr.2005.2.06.
[3]张玉玲,辛学忠,刘晓光.对正交异性钢桥面板构造抗疲劳设计方法的分析[J].钢结构,2009,24(5):33-37.DOI:10.969/j.issn.1007-9963.009.5.08.ZHANG Yuling,XIN Xuezhong,LIU Xiaoguang.A-nalysis on fatigue design method of orthotropic floor details in steel bridge[J].Steel Construction,2009,24(5):33-37.DOI:10.969/j.issn.1007-9963.009.5.08.(in Chinese)
[4]李体翰,檀永刚.U肋焊接残余应力数值分析[J].北方交通,2016(5):12-16.DOI:10.5996/j.cnki.bfjt.2016.5.04.LI Tihan,TAN Yonggang.Numerical analysis of welding residual stress of U-rib[J].Northern Communications,2016(5):12-16.DOI:10.5996/j.cnki.bfjt.2016.5.04.(in Chinese)
[5]杨绍林,卜一之,崔闯,等.U肋对接焊缝三维疲劳裂纹应力强度因子分析[J].桥梁建设,2015,45(5):54-59.YANG Shaolin,BU Yizhi,CUI Chuang,et al.Analysis of stress intensity factors of 3-dimensional fatigue crack in butt weld joint of U-rib[J].Bridge Construction,2015,45(5):54-59.(in Chinese)
[6]朱劲松,郭耀华.正交异性钢桥面板疲劳裂纹扩展机理及数值模拟研究[J].振动与冲击,2014(14):40-47.DOI:10.3465/j.cnki.jvs.2014.4.08.ZHU Jinsong,GUO Yaohua.Numerical simulation on fatigue crack growth of orthotropic steel highway bridge deck[J].Journal of Vibration and Shock,2014(14):40-47.DOI:10.3465/j.cnki.jvs.2014.4.08.(in Chinese)
[7]曾志斌.正交异性钢桥面板典型疲劳裂纹分类及其原因分析[J].钢结构,2011,26(2):9-15.DOI:10.969/j.issn.1007-9963.011.2.03.ZENG Zhibin.Classification and reasons of typical fatigue cracks in orthotropic steel deck[J].Steel Construction,2011,26(2):9-15.DOI:10.969/j.issn.1007-9963.011.2.03.(in Chinese)
[8]FU Z,JI B,ZHANG C,et al.Experimental study on the fatigue performance of roof and U-rib welds of orthotropic steel bridge decks[J].KSCE Journal of Civil Engineering,2017(3):1-9.DOI:10.007/s12205-017-1725-0.
[9]苏庆田,贺欣怡,曾明根.组合桥面板U肋对接焊缝疲劳破坏及修复方法试验[J].同济大学学报(自然科学版),2017,45(2):167-172.DOI:10.1908/j.issn.0253-374x.2017.2.02.SU Qingtian,HE Xinyi,ZENG Minggen.Experiment research on fatigue failure and repair method of butt weld in U-shaped rib of composite bridge deck[J].Journal of Tongji University(Natural Science),2017,45(2):167-172.DOI:10.1908/j.issn.0253-374x.2017.2.02.(in Chinese)
[10]周泳涛,刘延芳,翟辉,等.公路钢桥疲劳设计横向多车效应分析[J].公路交通科技,2010,27(9):80-84.DOI:10.969/j.issn.1002-0268.010.9.14.ZHOU Yongtao,LIU Yanfang,ZHAI Hui,et al.Study of transverse multiple vehicle effect for fatigue design of highway steel bridge[J].Journal of Highway and Transportation Research and Development,2010,27(9):80-84.DOI:10.969/j.issn.1002-0268.010.9.14.(in Chinese)
[11]崔冰,吴冲,丁文俊,等.车辆轮迹线位置对钢桥面板疲劳应力幅的影响[J].建筑科学与工程学报,2010,27(3):19-23.CUI Bing,WU Chong,DING Wenjun,et al.Influence of acting position of vehicle wheels on fatigue stress range of steel deck[J].Journal of Architecture and Civil Engineering,2010,27(3):19-23.(in Chinese)
[12]宋永生.正交异性钢桥面板疲劳监测与试验研究[D].南京:东南大学,2014.
[13]冯兵.公路正交异性钢桥面板构造细节的热点应力分析及疲劳研究[D].成都:西南交通大学,2014.
[14]吉伯海,朱伟,傅中秋,等.正交异性钢桥面板U肋对接焊缝疲劳寿命评估[J].重庆交通大学学报(自然科学版),2015,34(1):16-21.DOI:10.969/j.issn.1674-0696.015.1.4.JI Bohai,ZHU Wei,FU Zhongqiu,et al.Fatigue life evaluation of U-rib butt weld of the orthotropic steel bridge[J].Journal of Chongqing Jiaotong University(Natural Sciences),2015,34(1):16-21.DOI:10.969/j.issn.1674-0696.015.1.4.(in Chinese)
[15]沈刚,陈祥,王满满,等.车流荷载作用下三塔悬索桥主梁动力响应分析[J].江苏科技大学学报(自然科学版),2015,29(4):403-408.DOI:10.969/j.issn.1673-4807.015.4.17.SHEN Gang,CHEN Xiang,WANG Manman,et al.Dynamic response of main girders of three-tower suspension bridge under random traffic flow[J].Journal of Jiangsu University of Science and Technology(Natural Science Edition),2015,29(4):403-408.DOI:10.969/j.issn.1673-4807.015.4.17.(in Chinese)
[16]FU Z,JI B,YE Z,et al.Fatigue evaluation of cablestayed bridge steel deck based on predicted traffic flow growth[J].KSCE Journal of Civil Engineering,2017(4):1-10.
[17]AGHOURY I E,GALAL K.A fatigue stress-life damage accumulation model for variable amplitude fatigue loading based on virtual target life[J].Engineering Structures,2013,52(9):621-628.DOI:10.016/j.engstruct.2013.3.01.
[18]唐文献,赵海洋,孟淼,等.基于谱分析法的桩腿疲劳寿命研究[J].江苏科技大学学报(自然科学版),2016,30(5):445-449.DOI:10.969/j.issn.1673-4807.016.5.07.TANG Wenxian,ZHAO Haiyang,MENG Miao,et al.Study of leg fatigue life based on spectral analysis[J].Journal of Jiangsu University of Science and Technology(Natural Science Edition),2016,30(5):445-449.DOI:10.969/j.issn.1673-4807.016.5.07.(in Chinese)