内压和振动载荷联合作用下埋地管线疲劳寿命评估
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摘要
紧临铁路桥墩的埋地管线,其疲劳寿命受列车引起的振动的影响。文中以某埋地天然气高压管线为例,建立管线循环内压和桥墩振动载荷联合作用下的管线疲劳寿命评估方法。首先,偏于安全考虑,将测得的桥墩上三个方向振动载荷直接施加于管线上,进行动应力计算,获得随时间变化的应力谱;其次,运用雨流计数法对应力水平和频次进行分类;最后,运用材料S—N疲劳曲线和Miner线性累积损伤原理对管线的疲劳寿命进行评估,且分析不同土壤力学性能参数和桥梁振动频次等因素对管线疲劳寿命的影响,为埋地管线的此类疲劳问题提供一个有效的工程分析方法。
The fatigue lifetime of the buried pipelines is greatly affected by the loads arising from the train vibrating in the case that they are close to the railway pier. An evaluation method of fatigue lifetime under cyclic internal pressure of pipeline and vibrating loads of pier is established for some natural gas high pressure pipeline. First,from the conservative point of view,dynamic stress calculations were conducted by directly exerting the measured vibration loads of pier in three directions on the pipeline and the stress spectrums of nodes with time were obtained. Second,the rain-flowing counting method was employed to sort the stress level and frequency. Finally,the S—N material fatigue curve and the Miner linear cumulative damnification principle were commonly applied to evaluate the fatigue lifetime of the pipeline,and effects of various mechanical parameters of soil as well as vibration frequency of bridge were analyzed,which provided an effective engineering analysis method for these kinds of fatigue problems of the buried pipeline.
The fatigue lifetime of the buried pipelines is greatly affected by the loads arising from the train vibrating in the case that they are close to the railway pier. An evaluation method of fatigue lifetime under cyclic internal pressure of pipeline and vibrating loads of pier is established for some natural gas high pressure pipeline. First,from the conservative point of view,dynamic stress calculations were conducted by directly exerting the measured vibration loads of pier in three directions on the pipeline and the stress spectrums of nodes with time were obtained. Second,the rain-flowing counting method was employed to sort the stress level and frequency. Finally,the S—N material fatigue curve and the Miner linear cumulative damnification principle were commonly applied to evaluate the fatigue lifetime of the pipeline,and effects of various mechanical parameters of soil as well as vibration frequency of bridge were analyzed,which provided an effective engineering analysis method for these kinds of fatigue problems of the buried pipeline.
引文
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[3]杨其伟,屈铁军,林锋.地震作用下埋地管线轴线随机反应[J].北方工业大学学报,2004,16(1):87-94.YANG Qi Wei,QU TieJun,LIN Feng.Random analysis on the axial seismic response of buried pipeline[J].Journal of North China University of Technology,2004,16(1):87-94(In Chinese).
[4]李国辉,刘其民,付国英,等.埋地输气管道疲劳强度分析[J].管道技术与设备,2006,2:45-46.LI GuoHui,LIUQi Min,FUGuoYing,et al.Fatigue strength analysis of buried gas transportation pipeline[J].Pipeline Technology and Equip-ment,2006,2:45-46(In Chinese).
[5]陈万春,马建秦.既有桥梁可靠度与安全使用寿命的综合评估[J].公路交通科技,2006,23(7):78-81.CHEN WanChun,MAJianQin.Integrative assessment on an old bridge based onreliability and safe life-span[J].Journal of Highway and Trans-portation Researchand Development,2006,23(7):78-81(In Chinese).
[6]吴小刚.交通荷载下管道疲劳寿命的模糊可靠度方法[J].油气储运,2005,24(1):17-20.WUXiaoGang.Fuzzyreliability method of fatigue lifetime of pipeline un-dertrafficloads[J].Oil&Gas Storage and Transportaion,2005,24(1):17-20(In Chinese).
[7]王春生,陈艾荣,陈惟珍.铆接钢桥剩余寿命与使用安全评估方法[J].同济大学学报:自然科学版,2006,34(3):325-330.WANG ChunSheng,CHENAiRong,CHEN WeiZhen.Assessment meth-ods of remainingfatiguelife andservice safetyforrivetedsteel bridges[J].Journal of Tongji University:Natural Science,2006,34(3):325-330(In Chinese).
[8]李舜酩.机械疲劳与可靠性设计[M].北京:科学出版社,2006:119-120.LI ShunMing.Mechanical fatigue and reliability design[M].Beijing:Science Press,2006:119-120(In Chinese).
[9]刘金砺.桩基础设计与计算[M].北京:中国建筑工业出版社,1990:70-84.LIUJinLi.Pile foundation design and calculation[M].Beijing:Chinese Press of Architecture Industry,1990:70-84(In Chinese).
[10]董建国.土力学与地基基础[M].上海:同济大学出版社,2005:111.DONGJianGuo.Soil mechanics and foundation base[M].Shanghai:Tongji University Press,2005:111(In Chinese).
[11]中国压力容器标准化技术委员会.JB4732—1995钢制压力容器———分析设计标准[S].北京:锅容标准出版社,1995:17-205.Chinese Standardization Committee of Pressure Vessel.JB4732—1995Steel pressure vessel-analytical design criterion[S].Bejing:Boil and Pressure Vessel Criterion Press,1995:17-205(In Chinese).
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