给水管道地震作用下可靠度分析
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摘要
目的研究给水管道在地震作用下地面运动具有很大非平稳性时的可靠度.方法将地面运动看作在时间和空间上分布的随机过程.建立地下供水管道在地震力作用下的力学模型、数学模型,地下供水管道在非平稳激励下的响应数学表达式,可靠度数学表达式.采用首次超越破坏理论分析管道的可靠度.结果7度地震作用下的接口可靠度为0.992;在8度地震作用下的接口可靠度为0.978;在9度地震作用下的接口可靠度为0.914.并且随地震烈度的加大,其可靠度降低幅度不大.结论U-PVC管道接口较铸铁管道接口有更高的可靠度,U-PVC管道可以在震害中更好地保证管网的供水功能.
The purpose of this paper is to study on seismic reliability of watersupply pipes under non-stationary earthquake.Considering the ground motion as random process on time and space.Establishing the dynamic and mathematic formula of buried pipes under earthquake,the mathematic formula of pipes under non-stationary process,and the formula of pipes'seismic reliabilities to use the first overpass probability theory to give analysis about pipes'reliability.As a result we get the seismic reliable degree of U-PVC under different seismic intensities:under 7 seismic intensities,the result is 0.992;under 8 seismic intensities,the result is 0.978;under 9 seismic intensities,the result is 0.914.And we also find U-PVC pipes don't have much decrease with a higher seismic intensity.They have a higher reliable degree comparing to cast iron pipes.U-PVC pipes can protect web water supply function under earthquake.
The purpose of this paper is to study on seismic reliability of watersupply pipes under non-stationary earthquake.Considering the ground motion as random process on time and space.Establishing the dynamic and mathematic formula of buried pipes under earthquake,the mathematic formula of pipes under non-stationary process,and the formula of pipes'seismic reliabilities to use the first overpass probability theory to give analysis about pipes'reliability.As a result we get the seismic reliable degree of U-PVC under different seismic intensities:under 7 seismic intensities,the result is 0.992;under 8 seismic intensities,the result is 0.978;under 9 seismic intensities,the result is 0.914.And we also find U-PVC pipes don't have much decrease with a higher seismic intensity.They have a higher reliable degree comparing to cast iron pipes.U-PVC pipes can protect web water supply function under earthquake.
引文
[1]屈铁军,王前信.地下管线在空间随机分布的地震作用下的反应[J].工程力学,2003,20(3):120-124.
[2]Newmark N M.Problems in wave propagationin soiland rock.proc.of international symposium on propaga-tion and dynamic properties of earth materials[C]//Albuquerque:New Mexico,1967.
[3]屈铁军,王前信.地下管线多点地震激励纵向振动的级数解[J].地震工程与工程振动,1993,13(4):39-46.
[4]严松宏,梁波,高峰,等.考虑地震非平稳性的隧道纵向抗震可靠度分析[J].岩石力学与工程学报,2005,24(5):818-822.
[5]Xu Chengchao,Goulter I C.Probabilistic model for wa-ter distribution reliability[J].J.Water Resources Plan-ning and Management,1998,124(4):218-228.
[6]戴宗信.结构动力学的概率分析[M].上海:上海交通大学出版社,1989.
[7]Zerva A,Ang A H S,Wen Y K.Lifeline response tospatially variable ground motion[J].Earthquake Engi-neering&Structural Dynamics,1988,16(3):361-379.
[8]Wang L R L,Shim J S,Ishibashi I,et al.Dynamic re-sponses of buried pipeline during a liquefaction process[J].International Journal of Soil Dynamics and Earth-quake Engineering.Condor,Engand,1990,9(1):44-55.
[9]龙驭球.弹性地基梁的计算[M].北京:人民教育出版社,1981
[2]Newmark N M.Problems in wave propagationin soiland rock.proc.of international symposium on propaga-tion and dynamic properties of earth materials[C]//Albuquerque:New Mexico,1967.
[3]屈铁军,王前信.地下管线多点地震激励纵向振动的级数解[J].地震工程与工程振动,1993,13(4):39-46.
[4]严松宏,梁波,高峰,等.考虑地震非平稳性的隧道纵向抗震可靠度分析[J].岩石力学与工程学报,2005,24(5):818-822.
[5]Xu Chengchao,Goulter I C.Probabilistic model for wa-ter distribution reliability[J].J.Water Resources Plan-ning and Management,1998,124(4):218-228.
[6]戴宗信.结构动力学的概率分析[M].上海:上海交通大学出版社,1989.
[7]Zerva A,Ang A H S,Wen Y K.Lifeline response tospatially variable ground motion[J].Earthquake Engi-neering&Structural Dynamics,1988,16(3):361-379.
[8]Wang L R L,Shim J S,Ishibashi I,et al.Dynamic re-sponses of buried pipeline during a liquefaction process[J].International Journal of Soil Dynamics and Earth-quake Engineering.Condor,Engand,1990,9(1):44-55.
[9]龙驭球.弹性地基梁的计算[M].北京:人民教育出版社,1981
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