城市地下供水管道的地震反应分析
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摘要
在埋地管道抗震规范法的基础上提出改进,考虑了管土之间的弹塑性滑移,并推导了埋地管道在地震作用下最大反应的解析表达式。运用ANSYS建立了地下管线在地震作用下的有限元模型,合理运用接触单元真实地模拟了管土之间的相互作用,并计算了埋地管道在给定地震作用下的响应时程,从而得到管道的最大轴向应力。通过工程实例比较了抗震规范法、改进的抗震规范法以及有限元法计算埋地管道最大地震响应的优缺点。研究结果表明,改进的规范法的计算结果与相对精确的有限元法的计算结果相近,说明改进的规范法简单实用,且能满足一定的精度要求。
Considering the elastoplasticity slippage between pipe and soil,improvement was proposed based on the seismic code for buried pipeline,and the analytical expression of the maximum response of the buried pipeline was derived.The finite element model of the buried pipeline under earthquake effect was built by the ANSYS,the contact element was reasonably used to imitate the pipe-soil interaction veritably,and the response time history of the buried pipeline under a given earthquake effect was calculated,so the biggest axial stress was obtained.The advantages and disadvantages of the seismic code method,improved seismic code method and finite element method calculating the maximal seismic response were compared according to an engineering example.The results of the study indicate that the results of the improved seismic code method are more close to relatively accurate finite element method,this shows that improved seismic code method is not only simple and practical,but also satisfing certain accuracy,it is very feasible,accurate and efficient when a large number of analysis for the seismic response of the buried pipelines are doing.
Considering the elastoplasticity slippage between pipe and soil,improvement was proposed based on the seismic code for buried pipeline,and the analytical expression of the maximum response of the buried pipeline was derived.The finite element model of the buried pipeline under earthquake effect was built by the ANSYS,the contact element was reasonably used to imitate the pipe-soil interaction veritably,and the response time history of the buried pipeline under a given earthquake effect was calculated,so the biggest axial stress was obtained.The advantages and disadvantages of the seismic code method,improved seismic code method and finite element method calculating the maximal seismic response were compared according to an engineering example.The results of the study indicate that the results of the improved seismic code method are more close to relatively accurate finite element method,this shows that improved seismic code method is not only simple and practical,but also satisfing certain accuracy,it is very feasible,accurate and efficient when a large number of analysis for the seismic response of the buried pipelines are doing.
引文
[1]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]李昕,周晶,陈建云.考虑土体非线性特性的直埋管道-土体系统的动力反应分析[J].计算力学学报,2001,18(2):167-172.
[3]Chen Huai,LI Jie,Sun Zengshou.Seismis fragility a-nalysis on pipeline system[J].Journal of Southeast U-niversity,1995,11(1):687-692.
[4]Hindy A,Novak M.Pipeline response to randomground motion[J].Journal of Structural MechannicsDivision,1980,106(2):339-360.
[5]Ariman T,Muleski G E.A review of the response ofburied pipeline under seismic excitations[J].Earth-quake Engineering and Structural Dynamics,1981,9(2):133-152.
[6]Newmark N W.Problems in wave propagaion in soiland rock[C]//Proc.of interational symposium onwave propagation and dynamic properties of earth mate-rials.Albuquerque,New Mexico,1967:7-26.
[7]Shinozuka M,Koike T.Estimation of structural strainsin underground lifeline pipes[J].International Journalof Pressure Vessels and Piping,1979:31-48.
[8]丁峻宏,金先龙,郭毅之,等.沉管隧道地震响应的三维非线性数值模拟方法及应用[J].振动与冲击,2005,24(5):53-57.
[9]GB 50032-2003,室外给水排水和燃气热力工程抗震设计规范[S].
[10]王琴.地下管线非一致激励地震反应分析[D].上海:同济大学,2008.
[11]赵林,冯启明.埋地管线有限元建模方法研究[J].地震工程与工程振动,2001,21(2):53-57.
[12]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2009.
[2]李昕,周晶,陈建云.考虑土体非线性特性的直埋管道-土体系统的动力反应分析[J].计算力学学报,2001,18(2):167-172.
[3]Chen Huai,LI Jie,Sun Zengshou.Seismis fragility a-nalysis on pipeline system[J].Journal of Southeast U-niversity,1995,11(1):687-692.
[4]Hindy A,Novak M.Pipeline response to randomground motion[J].Journal of Structural MechannicsDivision,1980,106(2):339-360.
[5]Ariman T,Muleski G E.A review of the response ofburied pipeline under seismic excitations[J].Earth-quake Engineering and Structural Dynamics,1981,9(2):133-152.
[6]Newmark N W.Problems in wave propagaion in soiland rock[C]//Proc.of interational symposium onwave propagation and dynamic properties of earth mate-rials.Albuquerque,New Mexico,1967:7-26.
[7]Shinozuka M,Koike T.Estimation of structural strainsin underground lifeline pipes[J].International Journalof Pressure Vessels and Piping,1979:31-48.
[8]丁峻宏,金先龙,郭毅之,等.沉管隧道地震响应的三维非线性数值模拟方法及应用[J].振动与冲击,2005,24(5):53-57.
[9]GB 50032-2003,室外给水排水和燃气热力工程抗震设计规范[S].
[10]王琴.地下管线非一致激励地震反应分析[D].上海:同济大学,2008.
[11]赵林,冯启明.埋地管线有限元建模方法研究[J].地震工程与工程振动,2001,21(2):53-57.
[12]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2009.
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