长输管道悬索跨越结构静动力性能的有限元分析
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摘要
应用ANSYS有限元程序,建立长输管道悬索跨越工程原型和1∶8试验模型的有限元计算模型,对有限元计算模型进行静力、模态和地震反应的有限元分析。结果表明:静力计算和模态分析中,计算结果与试验结果吻合很好,2个有限元模型的计算结果能较好地满足模型设计相似比,试验模型能较好地反映原型结构的性态;地震反应分析和试验中,输入的最大横向和竖向地震反应加速度折合原型均超过0.4g,但模型构件未发生破损,结构体系保持稳定,表明悬索跨越结构具有抗御地震烈度9度而保持使用功能的能力,但有限元模型地震反应计算结果与试验实测值之间存在着一定差异,分析了造成差异的原因。
Two finite element models were built by ANSYS according to the actual cable-stayed pipelines and the test model scaled to one eighth of the actual structure, respectively. Static, modal and earthquake response analysis were conducted for the two finite element models. The results from static and mode analyses show tha parameters obtained by finite element model based on the scaled structure agree with those by the model tests The results of the two finite element models meet the similitude principle. The test model could reflect the performance of the actual structure. In earthquake response analysis and shaking table test, the maxim longitudinal and transverse acceleration responses exceeded 0.4g in the actual scale, but the model members did not damage and the structure kept stable. It is shown that the cable-stayed structure can keep running when the input acceleration is 0.4g which corresponds to Richter Scale 9. The results of earthquake response calculated by finite element analysis showed some discrepancy with the ones by the shaking table test, the reasons of which are discussed in this paper.
Two finite element models were built by ANSYS according to the actual cable-stayed pipelines and the test model scaled to one eighth of the actual structure, respectively. Static, modal and earthquake response analysis were conducted for the two finite element models. The results from static and mode analyses show tha parameters obtained by finite element model based on the scaled structure agree with those by the model tests The results of the two finite element models meet the similitude principle. The test model could reflect the performance of the actual structure. In earthquake response analysis and shaking table test, the maxim longitudinal and transverse acceleration responses exceeded 0.4g in the actual scale, but the model members did not damage and the structure kept stable. It is shown that the cable-stayed structure can keep running when the input acceleration is 0.4g which corresponds to Richter Scale 9. The results of earthquake response calculated by finite element analysis showed some discrepancy with the ones by the shaking table test, the reasons of which are discussed in this paper.
引文
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[9]冯启民,郭恩栋.跨断层埋地管道抗震试验[J].地震工程与工程振动,2000,20(1):56~63.Feng Qimin,Guo Endong.Aseismic analysis test of buried pipe crossing fault[J].Earthquake Engineering and Engineering Vibration,2000,20(1):56~63.(in Chinese)
[10]李忠献.工程结构试验理论与技术[M].天津:天津大学出版社,2004.Li Zhongxian.Theory and technology on engineering structure testing[M].Tianjin:Tianjin University Press,2004.(in Chinese)
[2]Yun H,Kyriakides S.Model for beam-mode buckling of buried pipelines[J].J of Eng Mech,1985,111(2):235~253.
[3]Yun H,Kyriakides S.On the beam and shell modes of buried pipelines[J].Int J of Soil Dyn Earthq Eng,1990,9(3):179~193.
[4]He Y A,Liang J W,Chen G.Shell-mode dynamic instability of buried pipelines by finite element method[A].Proc of Int Symp on Struct Tech of Pipeline Eng[C].Beijing:Science Press,1992.307~311.
[5]江建祥,黄幼玲.弹性支撑输流管道固有频率计算[J].振动工程学报,1992,5(4):396~402.Jiang Jianxiang,Huang Youling.Calculation of eigenfrequency of the conveying-fluid pipes on spring-support[J].Journal of Vibration Engineering,1992,5(4):396~402.(in Chinese)
[6]郭海燕,吴世明,孟凡顺.竖向地震荷载下输液管道弯曲振动的有限元分析[J].振动工程学报,1995,8(4):384~388.Guo Haiyan,Wu Shiming,Meng Fanshun.FEM analysis of bending vibration of a pipe conveying fluid during vertical earthquake[J].Journal of Vibration Engineering,1995,8(4):384~388.(in Chinese)
[7]郭海燕,孟凡顺.竖向地震作用下充满液体管道的地震反应分析[J].振动工程学报,1998,11(2):165~168.Guo Haiyan,Meng Fanshun.Bending vibration analysis of a fluid-filled pipe under vertical earthquake exciation[J].Journal of Vibration Engineering,1998,11(2):165~168.(in Chinese)
[8]郭恩栋,冯启民.跨断层埋地钢管道抗震计算方法研究[J].地震工程与工程振动,1999,19(4):43~47.Guo Endong,Feng Qimin.Aseismic analysis methods for buried steel pipe crossing fault[J].Earthquake Engineering and Engineering Vibration,1999,19(4):43~47.(in Chinese)
[9]冯启民,郭恩栋.跨断层埋地管道抗震试验[J].地震工程与工程振动,2000,20(1):56~63.Feng Qimin,Guo Endong.Aseismic analysis test of buried pipe crossing fault[J].Earthquake Engineering and Engineering Vibration,2000,20(1):56~63.(in Chinese)
[10]李忠献.工程结构试验理论与技术[M].天津:天津大学出版社,2004.Li Zhongxian.Theory and technology on engineering structure testing[M].Tianjin:Tianjin University Press,2004.(in Chinese)
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