钢桥面板钻孔工艺对止裂效果的影响分析
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摘要
考虑实桥顶板角焊缝疲劳裂纹止裂孔的钻孔角度、钻孔偏心角度和钻孔深度,建立了顶板与U肋有限元模型,得到了桥面板顶板顶面与底面止裂孔两侧的应力分布情况。从孔边应力与裂纹扩展速率两个方面,对比不同参数下的止裂效果,提出了钻孔工艺参数的建议范围。研究结果表明:为了避免加速裂纹扩展,建议钻孔角度为0°~25°;对于焊趾裂纹,为了保证止裂孔孔周应力分布均匀,建议钻孔偏心角度为-15°~30°;对于未贯穿止裂孔,钻孔深度较浅时,其内侧应力较大且底面应力分布不均匀。
Finite element models for a bridge steel deck fillet welded with a U-Rib were established with consideration of stop-holes(for fatigue cracks of the fillet weld) of different drilling angles,eccentric angles and drilling depths. Stress distributions on top and bottom surfaces of the steel deck near the stop-holes were obtained. Based on the stresses around the holes and crack propagation rates,crack arrest effects of the holes were evaluated under different working conditions. The results show that drilling angle ranging from 0° to 25° is favorable to avoid acceleration of crack propagation. Eccentric angle between-15° and 30° is suggested to achieve a uniform stress distribution around stop-hole. Moreover,in terms of non-penetrating stop-holes,shallow depth of the stop-holes results in larger stress at the inner side and non-uniform stress distribution on bottom surface of the steel deck.
Finite element models for a bridge steel deck fillet welded with a U-Rib were established with consideration of stop-holes(for fatigue cracks of the fillet weld) of different drilling angles,eccentric angles and drilling depths. Stress distributions on top and bottom surfaces of the steel deck near the stop-holes were obtained. Based on the stresses around the holes and crack propagation rates,crack arrest effects of the holes were evaluated under different working conditions. The results show that drilling angle ranging from 0° to 25° is favorable to avoid acceleration of crack propagation. Eccentric angle between-15° and 30° is suggested to achieve a uniform stress distribution around stop-hole. Moreover,in terms of non-penetrating stop-holes,shallow depth of the stop-holes results in larger stress at the inner side and non-uniform stress distribution on bottom surface of the steel deck.
引文
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[11]刘天笳,吉伯海,傅中秋,等.钢桥疲劳裂纹钻孔止裂技术多孔布置方法研究[J].合肥工业大学学报(自然科学版),2016,39(10):1376-1380.
[12]谢曙辉,吉伯海,傅中秋,等.钢桥面板疲劳裂纹钻孔止裂分析及实验验证[J].河南大学学报(自然科学版),2016,46(6):732-738.
[13]吉伯海,袁周致远,刘天笳,等.钢箱梁疲劳裂纹钻孔止裂修复的影响因素[J].江苏大学学报(自然科学版),2016,37(1):97-102.
[14]MIKI C.Fatigue damage in orthotropic steel bridge decks and retrofit works[J].International Journal of Steel Structures,2006,6(4):255-267.
[15]陈传尧,高大兴.疲劳断裂基础[M].武汉:华中科技大学出版社,1991.
[2]张允士,李法雄,熊锋,等.正交异性钢桥面板疲劳裂纹成因分析及控制[J].公路交通科技,2013,30(8):75-80.
[3]YA S,YAMADA K.Fatigue durability evaluation of trough to deck plate welded joint of orthotropic steel deck[J].Structural Engineering/Earthquake Engineering,2008,64(3):603-616.
[4]XIAO Z G,YAMADA K,YA S,et al.Stress analyses and fatigue evaluation of rib-to-deck joints in steel orthotropic decks[J].International Journal of Fatigue,2008,30(8):1387-1397.
[5]余波,邱洪兴,王浩,等.正交异性钢桥面板构造细节疲劳性能及损伤演化研究[J].公路交通科技,2009,26(9):64-69.
[6]安群慧.正交异性钢桥面板纵向U肋与横梁接缝的应力特点和疲劳裂纹特性[J].世界桥梁,2009(4):26-29.
[7]唐亮,黄李骥,刘高,等.正交异性钢桥面板顶板贯穿型疲劳裂纹研究[J].公路交通科技,2012,29(2):59-66.
[8]MURDANI A,MAKABE C,SAIMOTO A,et al.Stress concentration at stop-drilled holes and additional holes[J].Engineering Failure Analysis,2008,15(7):810-819.
[9]郭阿明,王力忠,田秋月.疲劳裂纹钻孔止裂技术研究[J].四川建筑科学研究,2008,34(4):107-109.
[10]谢曙辉,吉伯海,姚悦,等.钢桥面板顶板角焊缝疲劳裂纹钻孔孔位分析[J].广西大学学报(自然科学版),2017,42(1):290-298.
[11]刘天笳,吉伯海,傅中秋,等.钢桥疲劳裂纹钻孔止裂技术多孔布置方法研究[J].合肥工业大学学报(自然科学版),2016,39(10):1376-1380.
[12]谢曙辉,吉伯海,傅中秋,等.钢桥面板疲劳裂纹钻孔止裂分析及实验验证[J].河南大学学报(自然科学版),2016,46(6):732-738.
[13]吉伯海,袁周致远,刘天笳,等.钢箱梁疲劳裂纹钻孔止裂修复的影响因素[J].江苏大学学报(自然科学版),2016,37(1):97-102.
[14]MIKI C.Fatigue damage in orthotropic steel bridge decks and retrofit works[J].International Journal of Steel Structures,2006,6(4):255-267.
[15]陈传尧,高大兴.疲劳断裂基础[M].武汉:华中科技大学出版社,1991.