脉动激励下的浅埋管道轴向应力分析
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摘要
考虑土体-结构-流体耦合作用,研究流体脉动对浅埋输液管道轴向应力的影响。基于流固耦合、管-土耦合理论,建立了浅埋管道动力学分析模型,应用力平衡条件,推导了浅埋管道的静力及动力方程,并利用行波方法求取了动力方程的解析解。在此基础上,研究了管道应力特性。结果表明:流固耦合对浅埋管道应力有较大影响,较小幅值的压力脉动可使管道应力大幅增加。同时,讨论了管道埋深、土质条件及管道半径对管道应力的影响。在相同流体脉动激励下,管道应力随覆盖层厚度、土体刚度、管道半径增加而减小。
In consideration of coupled influence among soil-structure-fluid interaction,static and dynamic analysis of buried pipeline system conveying fluid is investigated by employing the traveling wave method.The dynamic analytical model of the shallowly buried pipeline is established based on soil-structure interaction(SSI)and fluid-structure interaction(FSI)theories;and the static and dynamic formulations are deduced by applying the equilibrium condition of forces.The analytical results are obtained by employing the traveling wave method.Based on the above work,the stress characteristics of the buried pipeline under fluid impulsive excitation are studied.Analysis results of numerical examples indicate that FSI can cause bigger stress level in the shallow buried pipeline.The stress amplitude of pipe under FSI has a remarkable change with the less amplitude variation of the fluid pulsation.In addition,the influences of embedded depth H,soil property and pipe radius R on pipe stress are discussed.Under the same impulse excitation action,the pipe stress reduces with the increasing of H,the soil spring stiffness and pipe radius R.
In consideration of coupled influence among soil-structure-fluid interaction,static and dynamic analysis of buried pipeline system conveying fluid is investigated by employing the traveling wave method.The dynamic analytical model of the shallowly buried pipeline is established based on soil-structure interaction(SSI)and fluid-structure interaction(FSI)theories;and the static and dynamic formulations are deduced by applying the equilibrium condition of forces.The analytical results are obtained by employing the traveling wave method.Based on the above work,the stress characteristics of the buried pipeline under fluid impulsive excitation are studied.Analysis results of numerical examples indicate that FSI can cause bigger stress level in the shallow buried pipeline.The stress amplitude of pipe under FSI has a remarkable change with the less amplitude variation of the fluid pulsation.In addition,the influences of embedded depth H,soil property and pipe radius R on pipe stress are discussed.Under the same impulse excitation action,the pipe stress reduces with the increasing of H,the soil spring stiffness and pipe radius R.
引文
[1]KAWABATA T,ARIYOSHI M,UCHIDA K D E M.Analysis on Behavior of Shallowly Buried Pipe Subject to Traffic Loads[J].New Pipeline Technologies,Security,and Safety,Proceedings of International Conference on Pipeline Engineering and Construction,ASCE,2003,(2):1218-1227.
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[10]Beale L S,ACCORSI M L.Power flow in two and three dimensional frame structures[J].Journal of Sound and Vibration,1995,185(4):685-702.
[11]诸德超,刑誉峰,程伟,等.工程振动基础[M].北京:北京航空航天大学出版社,2004.
[12]KOO G H,PARK Y S.Vibration analysis of a3-dimensional piping system conveying fluid by wave approach[J].International Journal of Pressure Vessel&Piping,1996,67:249-256.
[13]吴小刚,张土乔,张仪萍,等.管道埋深对管-土耦合应力的影响规律浅析[J].水利水电科技进展,2003,23(6):64-67.WU Xiao-gang,ZHANG Tu-qiao,ZHANG Yi-ping,et al.Effect of depth of pipe buried on pipe-soil coupling stress[J].Advances in Science and Technology of Water Resources,2003,23(6):64-67.
[14]李杰.生命线工程抗震:基础理论与应用[M].北京:科学出版社,2005.
[2]孙绍平,韩扬.生命线地震工程研究述评[J].土木工程学报,2003,36(5):97-104.SUN Shao-ping,HAN Yang.State of the art of the research on lifeline earthquake engineering[J].China Civil Engineering Journal,2003,36(5):97-104.
[3]张东臣,БыковЛИ.滑坡条件下埋地管道受力分析[J].石油规划设计,2001,12(6):1-6.ZHANG Dong-chen,БыковЛИ.The force-summing analysis of buried pipeline under landslide condition[J].Petroleum Lay-out and Design,2001,12(6):1-6.
[4]YUN MOOK LIM,MOON KYUM KIM,TAE WOOK KIM.The behavior analysis of buried pipeline consid-ering longitudinal permanent ground deformation[J].Jounal of Geotechnical Engineering,ASCE,2001:1-11.
[5]林毅峰,胡明.有压管道结构运动对管内水锤压力的影响研究[J].河海大学学报,2003,31(4):440-443.LIN Yi-feng,HU Ming.Effect of pressure conduit structure movement on water hammer pressure[J].Journal of Hohai University,2003,31(4):440-443.
[6]李勇.低输量运行方式对长输管线动水压力的影响[J].压力容器,2004,21(4):12-16.LI Yong.Low oil transportation way moves influence on water pressure of long distance pipeline[J].Pressure Vessel,2004,21(4):12-16.
[7]刘全林,杨敏.地埋管与土相互作用分析模型及其参数确定[J].岩土力学,2004,25(5):728-731.LIU Quan-lin,YANG Min.Analytical model and parameters determination of interaction between buried pipe and soil[J].Rock and Soil Mechanics,2004,25(5):728-731.
[8]YANG KE,LI Q S,ZHANG LIXIANG.Longitudinal vibration analysis of multi-span liquid-filled pipelines with rigid constraints[J].Journal of Sound and Vibration,2004,27(3):125-147.
[9]任建亭,林磊,姜节胜.管道流固耦合振动的行波方法研究[J].应用力学学报,2005,22(4):530-535.REN Jian-ting,LIN Lei,JIANG Jie-sheng.Traveling Wave Method for Pipe Fluid-Structure Interaction[J].Chinese Journal of Applied Mechanics,2005,22(4):530-535.
[10]Beale L S,ACCORSI M L.Power flow in two and three dimensional frame structures[J].Journal of Sound and Vibration,1995,185(4):685-702.
[11]诸德超,刑誉峰,程伟,等.工程振动基础[M].北京:北京航空航天大学出版社,2004.
[12]KOO G H,PARK Y S.Vibration analysis of a3-dimensional piping system conveying fluid by wave approach[J].International Journal of Pressure Vessel&Piping,1996,67:249-256.
[13]吴小刚,张土乔,张仪萍,等.管道埋深对管-土耦合应力的影响规律浅析[J].水利水电科技进展,2003,23(6):64-67.WU Xiao-gang,ZHANG Tu-qiao,ZHANG Yi-ping,et al.Effect of depth of pipe buried on pipe-soil coupling stress[J].Advances in Science and Technology of Water Resources,2003,23(6):64-67.
[14]李杰.生命线工程抗震:基础理论与应用[M].北京:科学出版社,2005.
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