热点应力法进行钢桥疲劳检算
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摘要
研究目的:随着钢桥的重载化和整体化,桥梁钢结构中出现了较多无法明确其名义应力、现行规范也无对应细节的复杂构造。在实践中,对于该类细节多采用原形疲劳试验的方法进行验证。但疲劳试验的长周期和高费用,制约了该类细节的快速应用和推广。本文旨在用热点应力进行钢桥疲劳检算,实现在设计阶段尽可能准确地评估复杂细节的疲劳性能的目的。研究结论:本文分析计算了多种接头的热点应力集中系数,采用热点应力集中系数法推导了钢桥疲劳检算的热点应力Shot～N曲线。BS5400规范多种构造细节的名义应力疲劳强度与导出的热点应力疲劳强度的对比表明,热点应力疲劳强度明显比名义应力法的离散性小,热点应力法适合桥梁工程应用。
Research purposes:As steel bridges are becoming more heavy-loaded and integrative,many complicated structures that their nominal stress can not be identified and their details can not corresponded with the existing design codes have happened in the steel bridge structure.In practice,the prototypical fatigue tests are usually done to validate these structures.However,the fatigue tests need long time and high cost and it restricts the fast and wide application of the fatigue test to validate the details of these structures.In order to accurately evaluate the fatigue behaviours of these details of the complicated structure,the study was done on the application of the hot spot stress in evaluating the bridge fatigue. Research conclusions:The analysis of the concentration factors of the hot spot stress of many kinds of joint was made and the shs-N curve of the hot spot stress for checking the steel bridge fatigue was deduced by using the concentration factors of the hot spot stress.The comparison of the fatigue strength of nominal stress of the many kinds of structure details stipulated in BS5400 with the deduced fatigue strength of hot spot stress showed the deduced fatigue strength of hot spot stress was obviously less than the discreteness obtained with the nominal stress method.So the hot spot stress method is available for bridge construction.
Research purposes:As steel bridges are becoming more heavy-loaded and integrative,many complicated structures that their nominal stress can not be identified and their details can not corresponded with the existing design codes have happened in the steel bridge structure.In practice,the prototypical fatigue tests are usually done to validate these structures.However,the fatigue tests need long time and high cost and it restricts the fast and wide application of the fatigue test to validate the details of these structures.In order to accurately evaluate the fatigue behaviours of these details of the complicated structure,the study was done on the application of the hot spot stress in evaluating the bridge fatigue. Research conclusions:The analysis of the concentration factors of the hot spot stress of many kinds of joint was made and the shs-N curve of the hot spot stress for checking the steel bridge fatigue was deduced by using the concentration factors of the hot spot stress.The comparison of the fatigue strength of nominal stress of the many kinds of structure details stipulated in BS5400 with the deduced fatigue strength of hot spot stress showed the deduced fatigue strength of hot spot stress was obviously less than the discreteness obtained with the nominal stress method.So the hot spot stress method is available for bridge construction.
引文
[1]中国船级社.中国船级社指导性文件——船体结构疲劳强度指南[Z].北京:人民交通出版社,2007.China Classification Society.CCS Guidance Documents-Guidelines for the Fatigue Strength of Ship Structure[Z].Beijing:China Communications Press,2007.
[2]王斌杰.高速列车结构热点应力疲劳评定方法及应用研究[D].北京:北京交通大学,2008.Wang Binjie.Research on Hot Spot Stress Approach ofFatigue Evaluation and Application for High Speed Car[D].Beijing:Beijing Jiaotong University,2008.
[3]周张义,李芾.基于表面外推的热点应力法平板焊趾疲劳分析研究[J].铁道学报,2009(5):90-96.Zhou Zhangyi,Li Fu.Study on Fatigue Analysis ofWelded Toes of Plate Structures Using Hot Spot StressMethod Based on Surface Extrapolation[J].Journal ofthe China Railway Society,2009(5):90-96.
[4]贾法勇,霍立兴,张玉凤,等.热点应力有限元分析的主要影响因素[J].焊接学报,2003(3):27-30.Jia Fayong,Huo Lixing,Zhang Yufeng,etc.KeyInfluence Factors in Hot Spot Stress FEM Analysis[J].Transactions of the China Welding Institution,2003(3):27-30.
[5]贾法勇,霍立兴,吴冰,等.用热点应力评定双相不锈钢焊接接头疲劳强度.天津大学学报,2004(11):1014-1017.Jia Fayong,Huo Lixing,Wu Bing,etc.Evaluation onFatigue Strength of Duplex Stainless Steel Welded Jointsby Hot Spot Stress[J].Journal of Tianjin University,2004(11):1014-1017.
[6]乔晋飞,李凤芹.钢桁结合梁整体节点及细节构造设计与研究[J].铁道工程学报,2009(8):68-72.Qiao Jinfei,Li Fengqin.Study and Design of IntegralJoints and Detailed Structures of Steel Truss Girder[J].Journal of Railway Engineering Society,2009(8):68-72.
[7]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(10):1428-1433.Zhang Qiwei,Zhang Pengfei.Hot Spot StressConcentration Factor for Welded Joints in SteelOrthotropic Decks[J].Journal of Tongji University(Natural Science),2010(10):1428-1433.
[8]周张义,李芾.基于表面外推的热点应力法平板焊趾疲劳分析研究[J].铁道学报,2009(5):90-96.Zhou Zhangyi,Li Fu.Study on Fatigue Analysis ofWelded Toes of Plate Structures Using Hot Spot StressMethod Based on Surface Extrapolation[J].Journal ofthe China Railway Society,2009(5):90-96.
[9]周太全,陈鸿天.香港青马大桥交通荷载作用下的疲劳评估[J].地震工程与工程振动,2002(5):24-29.Zhou Taiquan,Chen Hongtian.Fatigue Evaluation ofTsing-Ma bridge Subjected to Traffic Loading[J].Earthquake Engineering and Engineering Vibration,2002(5):24-29.
[10]王国波,谢伟平,于艳丽.高速列车荷载作用下铸钢焊接节点的疲劳分析[J].振动与冲击,2011(9):55-58.Wang Guobo,Xie Weiping,Yu Yanli.Fatigue Analysisof Cast Steel Welded Joint under Dynamic Load of HighSpeed Train[J].Journal of Vibration and Shock,2011(9):55-58.
[11]陈有芳,金秋东,张少雄.船舶热点疲劳强度研究[J].船海工程,2010(2):5-7.Chen Youfang,Jin Qiudong,Zhang Shaoxiong.Research of Ship Fatigue Strength Assessment with HotStress Method[J].Ship&Ocean Engineering,2010(2):5-7.
[2]王斌杰.高速列车结构热点应力疲劳评定方法及应用研究[D].北京:北京交通大学,2008.Wang Binjie.Research on Hot Spot Stress Approach ofFatigue Evaluation and Application for High Speed Car[D].Beijing:Beijing Jiaotong University,2008.
[3]周张义,李芾.基于表面外推的热点应力法平板焊趾疲劳分析研究[J].铁道学报,2009(5):90-96.Zhou Zhangyi,Li Fu.Study on Fatigue Analysis ofWelded Toes of Plate Structures Using Hot Spot StressMethod Based on Surface Extrapolation[J].Journal ofthe China Railway Society,2009(5):90-96.
[4]贾法勇,霍立兴,张玉凤,等.热点应力有限元分析的主要影响因素[J].焊接学报,2003(3):27-30.Jia Fayong,Huo Lixing,Zhang Yufeng,etc.KeyInfluence Factors in Hot Spot Stress FEM Analysis[J].Transactions of the China Welding Institution,2003(3):27-30.
[5]贾法勇,霍立兴,吴冰,等.用热点应力评定双相不锈钢焊接接头疲劳强度.天津大学学报,2004(11):1014-1017.Jia Fayong,Huo Lixing,Wu Bing,etc.Evaluation onFatigue Strength of Duplex Stainless Steel Welded Jointsby Hot Spot Stress[J].Journal of Tianjin University,2004(11):1014-1017.
[6]乔晋飞,李凤芹.钢桁结合梁整体节点及细节构造设计与研究[J].铁道工程学报,2009(8):68-72.Qiao Jinfei,Li Fengqin.Study and Design of IntegralJoints and Detailed Structures of Steel Truss Girder[J].Journal of Railway Engineering Society,2009(8):68-72.
[7]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(10):1428-1433.Zhang Qiwei,Zhang Pengfei.Hot Spot StressConcentration Factor for Welded Joints in SteelOrthotropic Decks[J].Journal of Tongji University(Natural Science),2010(10):1428-1433.
[8]周张义,李芾.基于表面外推的热点应力法平板焊趾疲劳分析研究[J].铁道学报,2009(5):90-96.Zhou Zhangyi,Li Fu.Study on Fatigue Analysis ofWelded Toes of Plate Structures Using Hot Spot StressMethod Based on Surface Extrapolation[J].Journal ofthe China Railway Society,2009(5):90-96.
[9]周太全,陈鸿天.香港青马大桥交通荷载作用下的疲劳评估[J].地震工程与工程振动,2002(5):24-29.Zhou Taiquan,Chen Hongtian.Fatigue Evaluation ofTsing-Ma bridge Subjected to Traffic Loading[J].Earthquake Engineering and Engineering Vibration,2002(5):24-29.
[10]王国波,谢伟平,于艳丽.高速列车荷载作用下铸钢焊接节点的疲劳分析[J].振动与冲击,2011(9):55-58.Wang Guobo,Xie Weiping,Yu Yanli.Fatigue Analysisof Cast Steel Welded Joint under Dynamic Load of HighSpeed Train[J].Journal of Vibration and Shock,2011(9):55-58.
[11]陈有芳,金秋东,张少雄.船舶热点疲劳强度研究[J].船海工程,2010(2):5-7.Chen Youfang,Jin Qiudong,Zhang Shaoxiong.Research of Ship Fatigue Strength Assessment with HotStress Method[J].Ship&Ocean Engineering,2010(2):5-7.
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