等壁厚钢管桩横向焊缝应力集中系数的数值模拟
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摘要
大型海洋工程结构多常用钢管桩,在钢管桩的制作和安装过程中通常会产生环向对接焊缝,由管节偏位引起的环向焊缝应力集中现象是焊缝疲劳热点应力评估和焊缝疲劳安全分析的重要影响因素。通过实用近似分析方法,研究在轴向拉力和平面内弯矩单独作用下等壁厚对接焊缝应力集中问题,得出等壁厚拉弯构件对接焊缝应力集中系数的近似计算公式;根据对钢管桩模型案例的试算,该近似公式的计算结果与ANSYS有限元数值模拟结果非常接近,可供实际工程参考。
Steel pipe piles are widely applied in large marine structure projects.Hoop butt-jointed welds are usually generated during the fabrication and installation of steel piles.The stress concentration at hoop butt-jointed welds caused by socket misalignment is an important factor which affects the hotspot stress evaluation and the safety analysis of fatigue welds.By the approximate analysis method,we research the stress concentration at the butt-jointed weld between the steel pipe piles in identical wall thickness under axial tension or in-plane bending moment,and furthermore develop an approximate formula for the stress concentration factor at the butt-jointed weld between the bending structures in identical wall thickness.According to a trial calculation of steel pipe piles model,the result by the approximate formula is very close to the value by ANSYS finite element numerical simulation,which will provide references for similar projects.
Steel pipe piles are widely applied in large marine structure projects.Hoop butt-jointed welds are usually generated during the fabrication and installation of steel piles.The stress concentration at hoop butt-jointed welds caused by socket misalignment is an important factor which affects the hotspot stress evaluation and the safety analysis of fatigue welds.By the approximate analysis method,we research the stress concentration at the butt-jointed weld between the steel pipe piles in identical wall thickness under axial tension or in-plane bending moment,and furthermore develop an approximate formula for the stress concentration factor at the butt-jointed weld between the bending structures in identical wall thickness.According to a trial calculation of steel pipe piles model,the result by the approximate formula is very close to the value by ANSYS finite element numerical simulation,which will provide references for similar projects.
引文
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[2]朱才科,郑海洪,王嘉定,等.大直径超长钢管桩制造技术[J].桥梁建设,2006(3):47-50.
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[5]安振武.对接焊缝错位应力集中系数研究[D].大连:大连理工大学,2010.
[6]周瑾,祁文军,薛强.浅析应力集中对焊接接头疲劳强度的影响[J].机械工程与自动化,2010(2):212-213.
[7]张文博,徐开国,张汝春.焊接接头疲劳强度的研究及其技术工艺的改进[J].煤矿机械,2005(3):70-73.
[8]安振武.焊缝结构错位应力集中系数研究[J].科学观察,2010(5):81-82.
[9]刘明,雷斌隆,徐磊.错边对压力管道焊接接头应力集中影响的研究[J].管道技术与设备,2008(1):36-37.
[10]周张义,李芾,卜继玲.基于名义应力的焊接结构疲劳强度评定方法研究[J].内燃机车,2007(7):1-4.
[11]张毅,黄小平,崔维成,等.对接接头焊趾处应力集中系数有限元分析[J].船舶力学,2004,8(5):91-99.
[12]IIW—1430—00 Fatigue Analysis of Welded ComponentsDesigner’s Guide to the Structural Hot-spot StressApproach[S].Cambridge:Woodhead Publishing Limited,2009.
[13]Li Y,Zhou S,Wang D.SIF and SCF of CircumferentialWelds on Steel Tubular Piles Under Bending Moments[C]//Proceedings of the ASME 29th International Conference onOcean,Offshore and Arctic Engineering.Shanghai:American Society of Mechanical Engineers,2010.
[14]Lotsberg I.Stress Concentration Factors at CircumferentialWelds in Tubular[J].Marine Structures,1998(11):207-230.
[15]Li Y,Lence B J,Zhou S,et al.Stochastic FatigueAssessment for Berthing Monopoles in Inland Waterways[J].ASCE Journal of Waterway,Port,Coastal,and OceanEngineering,2011,137(2):43-53.
[16]Lotsberg I.Stress Concentration Factors at Welds inPipelines and Tanks Subjected to Internal Pressure andAxial Force[J].Marine Structures,2008(21):138-159.
[17]API RP 2A—WSD:Recommended Practice for Planning,Designing and Constructing Fixed Offshore Platforms:Working Stress Design[S].Washington DC:AmericanPetroleum Institute,2000.
[18]罗刚,范引鹤,梁尤疆.高温合金焊接接头应力分析与疲劳寿命预测[J].航空动力学报,2007,22(2):327-331.
[19]陈旭华,基于ANSYS的传力杆与混凝土界面接触应力分析[J].湖南交通科技,2010,36(2):7-9.
[20]管德清,吕黎明,杨勇,等.焊接结构疲劳强度预测的局部法研究[J].湘潭大学学报:自然科学版,2005,27(1):36-39.
[21]JTJ254—1998港口工程桩基规范[S].北京:人民交通出版社,1998.
[2]朱才科,郑海洪,王嘉定,等.大直径超长钢管桩制造技术[J].桥梁建设,2006(3):47-50.
[3]Tomlinson M J.Pile Design and Construction Practice[M].Forth Edition.London:E&FN Spon,1994.
[4]DNV—RP—C203 Fatigue Design of Offshore SteelStructures[S].Norse land:Det Norske Veritas,2008.
[5]安振武.对接焊缝错位应力集中系数研究[D].大连:大连理工大学,2010.
[6]周瑾,祁文军,薛强.浅析应力集中对焊接接头疲劳强度的影响[J].机械工程与自动化,2010(2):212-213.
[7]张文博,徐开国,张汝春.焊接接头疲劳强度的研究及其技术工艺的改进[J].煤矿机械,2005(3):70-73.
[8]安振武.焊缝结构错位应力集中系数研究[J].科学观察,2010(5):81-82.
[9]刘明,雷斌隆,徐磊.错边对压力管道焊接接头应力集中影响的研究[J].管道技术与设备,2008(1):36-37.
[10]周张义,李芾,卜继玲.基于名义应力的焊接结构疲劳强度评定方法研究[J].内燃机车,2007(7):1-4.
[11]张毅,黄小平,崔维成,等.对接接头焊趾处应力集中系数有限元分析[J].船舶力学,2004,8(5):91-99.
[12]IIW—1430—00 Fatigue Analysis of Welded ComponentsDesigner’s Guide to the Structural Hot-spot StressApproach[S].Cambridge:Woodhead Publishing Limited,2009.
[13]Li Y,Zhou S,Wang D.SIF and SCF of CircumferentialWelds on Steel Tubular Piles Under Bending Moments[C]//Proceedings of the ASME 29th International Conference onOcean,Offshore and Arctic Engineering.Shanghai:American Society of Mechanical Engineers,2010.
[14]Lotsberg I.Stress Concentration Factors at CircumferentialWelds in Tubular[J].Marine Structures,1998(11):207-230.
[15]Li Y,Lence B J,Zhou S,et al.Stochastic FatigueAssessment for Berthing Monopoles in Inland Waterways[J].ASCE Journal of Waterway,Port,Coastal,and OceanEngineering,2011,137(2):43-53.
[16]Lotsberg I.Stress Concentration Factors at Welds inPipelines and Tanks Subjected to Internal Pressure andAxial Force[J].Marine Structures,2008(21):138-159.
[17]API RP 2A—WSD:Recommended Practice for Planning,Designing and Constructing Fixed Offshore Platforms:Working Stress Design[S].Washington DC:AmericanPetroleum Institute,2000.
[18]罗刚,范引鹤,梁尤疆.高温合金焊接接头应力分析与疲劳寿命预测[J].航空动力学报,2007,22(2):327-331.
[19]陈旭华,基于ANSYS的传力杆与混凝土界面接触应力分析[J].湖南交通科技,2010,36(2):7-9.
[20]管德清,吕黎明,杨勇,等.焊接结构疲劳强度预测的局部法研究[J].湘潭大学学报:自然科学版,2005,27(1):36-39.
[21]JTJ254—1998港口工程桩基规范[S].北京:人民交通出版社,1998.
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