正交异性钢桥面板肋-面板焊缝疲劳验算的应力分析模型评估
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摘要
以天津塘沽海河大桥的正交异性钢桥面板为例,建立钢箱梁节段的有限元分析(FEA)模型、简化FEA模型和基于钢箱梁节段的子模型进行肋-面板焊缝疲劳应力分析模型的评估。计算结果表明:对于远离纵腹板处的肋-面板焊缝,通过提高简化FEA模型中横隔板高度和约束横隔板底部翼缘的方式可减小与钢箱梁节段FEA模型结果的误差;对于靠近纵腹板处的肋-面板焊缝,所有简化FEA模型的应力计算结果均低于钢箱梁节段FEA模型的结果,且误差超过23%。基于钢箱梁节段的三跨子模型可以准确地给出钢桥面板任意位置的肋-面板焊缝的疲劳应力。它具有钢箱梁节段FEA模型的计算精度和简化FEA模型的计算效率,因此它可作为正交异性钢桥面板任意位置处肋-面板焊缝疲劳应力分析的准确和高效计算模型。
Based on the orthotropic steel deck of Haihe Bridge in Tanggu, Tianjin, three finite element analysis(FEA) models for the fatigue stress analysis of rib-to-deck welded joints are evaluated, where the three FEA models are a FEA model of a standard steel box girder segment, a simplified FEA model, and a submodel of a steel box girder. The results show that the deviation between the simplified FEA model results and the FEA model results of a standard steel box girder segment can be reduced by increasing the diaphragm depth and constraining the flanges at the bottom edges of the diaphragm when analyzing the fatigue stress of rib-to-deck joints far away from a longitudinal web. All the simplified FEA models are not applicable to the stress analysis of the rib-to-deck joints near a longitudinal web since the stresses given by all simplified FEA models are at least 23% lower than that given by a standard steel box girder segment model. The 3-span submodel based on a steel box girder can give accurate results for the fatigue stress of rib-to-deck joints at any position of an orthotropic steel deck. Therefore, the3-span submodel proposed is an efficient and accurate FEA model for the fatigue stress analysis of rib-to-deck welded joints at any position of a orthotropic steel deck, because it has the computational accuracy of the FEA model of a standard steel box girder segment and the computational efficiency of the simplified FEA model.
Based on the orthotropic steel deck of Haihe Bridge in Tanggu, Tianjin, three finite element analysis(FEA) models for the fatigue stress analysis of rib-to-deck welded joints are evaluated, where the three FEA models are a FEA model of a standard steel box girder segment, a simplified FEA model, and a submodel of a steel box girder. The results show that the deviation between the simplified FEA model results and the FEA model results of a standard steel box girder segment can be reduced by increasing the diaphragm depth and constraining the flanges at the bottom edges of the diaphragm when analyzing the fatigue stress of rib-to-deck joints far away from a longitudinal web. All the simplified FEA models are not applicable to the stress analysis of the rib-to-deck joints near a longitudinal web since the stresses given by all simplified FEA models are at least 23% lower than that given by a standard steel box girder segment model. The 3-span submodel based on a steel box girder can give accurate results for the fatigue stress of rib-to-deck joints at any position of an orthotropic steel deck. Therefore, the3-span submodel proposed is an efficient and accurate FEA model for the fatigue stress analysis of rib-to-deck welded joints at any position of a orthotropic steel deck, because it has the computational accuracy of the FEA model of a standard steel box girder segment and the computational efficiency of the simplified FEA model.
引文
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[15]张启伟,张鹏飞.正交异性钢桥面板焊接节点应力集中系数[J].同济大学学报(自然科学版),2010,38(10):1428―1433.Zhang Qiwei,Zhang Pengfei.Hot spot stress concentration factor for welded joints in steel orthotropic decks[J].Journal of Tongji University(Natural Science),2010,38(10):1428―1433.(in Chinese)
[2]Wolchuk R.Lessons from weld cracks in orthotropic decks on three European bridges[J].Journal of Structural Engineering,1990,116(1):75―84.
[3]Taskopoulos P A,Fisher J W.Full-scale fatigue tests of steel orthotropic decks for the Williamsburg bridge[J].Journal of Structural Engineering,2003,8(5):323―333.
[4]张清华,卜一之,李乔.正交异性钢桥面板疲劳问题的进展研究[J].中国公路学报,2017,30(3):14―30.Zhang Qinghua,Bu Yizhi,Li Qiao.Research progress on fatigue problems of orthotropic steel deck[J].Chinese Journal of Highway and Transport,2017,30(3):14―30.(in Chinese)
[5]祝志文,黄炎,陈魏,向泽.某正交异性板钢桥弧形切口疲劳开裂的现场监测分析[J].铁道科学与工程学报,2018,15(1):118―128.Zhu Zhiwen,Huang Yan,Chen Wei,Xiang Ze.Field monitoring analyses of diaphragm cutout fatigue cracking at an orthotropic steel bridge[J].Journal of Railway Science and Engineering,2018,15(1):118―128.(in Chinese)
[6]张清华,崔闯,卜一之,等.正交异性钢桥面板足尺节段疲劳模型试验研究[J].土木工程学报,2015,48(4):72―83.Zhang Qinghua,Cui Chuang,Bu Yizhi,et al.Experimental study on fatigue features of orthotropic bridge deckthrough full-scale segment models[J].China Civil Engineering Journal,2015,48(4):72―83.(in Chinese)
[7]蒲黔辉,高立强,刘振标,等.基于热点应力法的正交异性钢桥面板疲劳验算[J].西南交通大学学报,2013,48(3):395―401.Pu Chenhui,Gao Liqiang,Liu Zhenbiao,et al.Fatigue assessment of orthotropic steel bridge deck based on hot spot stress method[J].Journal of Southwest Jiaotong University,2013,48(3):395―401.(in Chinese)
[8]Liu R,Liu Y Q,Ji B H,et al.Hot spot stress analysis on rib-deck welded joint in orthotropic steel decks[J].Journal of Constructional Steel Research,2014,97(2):1―9.
[9]Xiao Z G,Yamada K,Ya S,Zhao X L.Stress analysis and fatigue evaluation of rib-to-deck joints in steel orthotropic decks[J].International Journal of Fatigue,2008,30(8):1387―1397.
[10]王高新,丁幼亮,宋永生,等.温度作用对带铺装层钢桥面板疲劳效应的影响研究[J].工程力学,2016,33(5):115―123.Wang Gaxoin,Ding Youliang,Song Yongsheng,et al.Influence of temperature action on the fatigue effect of steel deck with pavement[J].Engineering Mechanics,2016,33(5):115―123.(in Chinese)
[11]徐伟,李智,张肖宁.子模型法在大跨径斜拉桥桥面结构分析中的应用[J].土木工程学报,2004,37(6):30―34.Xu Wei,Li Zhi,Zhang Xiaoning.Application of submodeling method for analysis of deck structure of diagonal cable-stayed bridge with long span[J].China Civil Engineering Journal,2004,37(6):30―34.(in Chinese)
[12]李爱群,王浩.子模型法在超大跨悬索桥钢箱梁应力分析中的应用[J].工程力学,2007,24(2):80―84.Li Aiqun,Wang Hao.Stress analysis on steel box girders of super-loading-span suspension bridges with submodel method[J].Engineering Mechanics,2007,24(2):80―84.(in Chinese)
[13]邓鸣,张建仁,王蕊,等.UHPC铺装加固斜拉桥正交异性钢桥面板[J].长安大学学报(自然科学版),2018,38(1):61―74.Deng Ming,Zhang Jianren,Wang Rui,et al.Reinforcement of orthotropic steel bridge deck for cable-stayed bridge based on UHPC paving system[J].Journal of Chang’an University(Natural Science Edition),2018,38(1):61―74.(in Chinese)
[14]JTG D60―2015,公路桥涵设计通用规范[S].北京:人民交通出版社,2015.JTG D60―2015,General specifications for design of highway bridges and culverts[S].Beijing:China Communications Press,2015.(in Chinese)
[15]张启伟,张鹏飞.正交异性钢桥面板焊接节点应力集中系数[J].同济大学学报(自然科学版),2010,38(10):1428―1433.Zhang Qiwei,Zhang Pengfei.Hot spot stress concentration factor for welded joints in steel orthotropic decks[J].Journal of Tongji University(Natural Science),2010,38(10):1428―1433.(in Chinese)