地震作用下大型升船机结构的时变动力可靠度
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摘要
利用三维有限元方法对三峡升船机塔柱结构的动力学特性及随机地震响应进行了计算分析,结果表明塔柱结构柔度较大,其顶部节点随机地震位移响应为中宽带过程。在此基础上,采用首次超越破坏机制,以塔柱结构顶部典型位置的位移限值为可靠度界限,对设计地震烈度下升船机塔柱结构的时变动力可靠度进行了计算分析,得到了塔柱结构设计基准期内的时变动力可靠度,并讨论了可靠度界限值的随机性对结构抗震时变可靠度计算结果的影响,建议升船机结构抗震可靠度计算模型采用Markov过程假定。该文可为升船机结构设计及安全运行提供必要的参考。
The dynamic characteristics and the random seismic response of Three Gorges’ ship-lifting tower structure were investigated by using 3-D FEM model. The dynamic characteristics results show that the tower structure has large flexibility. The random seismic response is found to be a median-wide band process. Based on the first excursion probability mechanism,the time dependent dynamic reliability of the ship-lifting tower structure under designed earthquake intensity was calculated by assuming the reliability level to be the displacement limit of the structural typical position on the top floor of the tower. The time dependent dynamic reliability of the tower structure in the design base period was obtained. The effects of the definite level and the random level on the time dependent dynamic reliability under a seismic load were also discussed. The model based on Markov hypothesis is advised for aseismic reliability analysis of ship-lifting tower structures. It could provide engineering information for the design and safe service of ship-lifting structures.
The dynamic characteristics and the random seismic response of Three Gorges’ ship-lifting tower structure were investigated by using 3-D FEM model. The dynamic characteristics results show that the tower structure has large flexibility. The random seismic response is found to be a median-wide band process. Based on the first excursion probability mechanism,the time dependent dynamic reliability of the ship-lifting tower structure under designed earthquake intensity was calculated by assuming the reliability level to be the displacement limit of the structural typical position on the top floor of the tower. The time dependent dynamic reliability of the tower structure in the design base period was obtained. The effects of the definite level and the random level on the time dependent dynamic reliability under a seismic load were also discussed. The model based on Markov hypothesis is advised for aseismic reliability analysis of ship-lifting tower structures. It could provide engineering information for the design and safe service of ship-lifting structures.
引文
[1]吴杰芳,陈敏中,戴湘和.三峡工程垂直升船机建筑结构整体抗震计算[J].长江科学院院报,1997,14(3):43―46.Wu Jiefang,Chen Minzhong,Dai Xianghe.Whole structure aseismic computation of three gorges project’s ship-lift[J].Journal of Yangtze River Scientific Research Institute,1997,14(3):43―46.(in Chinese)
[2]德国“Li-Kuk”设计联营体,中国长江三峡工程开发总公司.长江三峡工程升船机-阶段B-设计报告[R].内部资料,2004.German Lahmeyer International(LI)-Krebs Und Kiefer(KUK)Joint Venture,China Three Gorges Project Corporation(CTGPC).Three gorges project ship lift―phase B―design Report[R].Inside Information,2004.(in Chinese)
[3]陈清军,王汉东.地震作用下大型升船机结构的响应特征分析[J].振动与冲击,2005,24(4):52―55.Chen Qingjun,Wang Handong.Analysis on the response of large-scale ship-lifting structure under aseismic loads[J].Journal of Vibration and Shock,2005,24(4):52―55.(in Chinese)
[4]陈清军,王汉东.升船机结构抗震可靠度分析中若干问题的探讨[J].力学季刊,2003,24(3):313―318.Chen Qingjun,Wang Handong.Study of some seismic reliability analysis problems of ship-lifter tower structure[J].Chinese Quarterly of Mechanics,2003,24(3):313―318.(in Chinese)
[5]肖帕(美).结构动力学:理论及其在地震工程中的应用[M].第2版-影印本.北京:清华大学出版社,2005.Anil K Chopra(USA).Dynamics of structures:Theory and applications to earthquake engineering[M].Second edition-Photostat copy.Beijing:Tsinghua University Press,2005.(in Chinese)
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[7]Housner G W.Characteristic of strong-motion earthquake[J].Bulletin of the Seismological Society of America(BSSA),1947,37(l):19―31.
[8]欧进萍,牛荻涛,杜修力.设计用随机地震动的模型及其参数确定[J].地震工程与工程振动,1991,11(3):45―54.Ou Jinping Niu Ditao,Du Xiuli.Random earthquake ground motion model and its parameter determination used in a seismic design[J].Earthquake Engineering and Engineering Vibration,1991,11(3):45―54.(in Chinese)
[9]Kanai K.An empirical formula for the spectrum of strong earthquake motions[J].Bulletin of the Earthquake Research Institute,Tokyo University,1961,39:85―95.
[10]胡聿贤,周锡元.弹性体系在平稳和平稳化地面运动下的反应[R].地震工程研究报告集(第1集).北京:科学出版社,1962:33―35.Hu Yuxian,Zhou Xiyuan.The response of elastic system under stationary ground motion[R].The Research Report Series on Earthquake Engineering(Volume1).Beijing:Science Press,1962:33―35.(in Chinese)
[11]克拉夫R,彭津J.结构动力学[M].第2版.王光远,译.北京:高等教育出版社,2006.Clough R,Penzien J.Dynamics of structures[M].2nd Ed.Translate by Wang Guangyuan.Beijing:Higher Education Press,2006.(in Chinese)
[12]杜修力,陈厚群.地震动随机模拟及其参数确定方法[J].地震工程和工程振动,1994,14(4):1―5.Du Xiuli,Chen Houqun.Random simulation and its parameter determination method of earthquake ground motion[J].Earthquake Engineering and Engineering Vibration,1994,14(4):1―5.(in Chinese)
[13]杜修力.水工建筑物抗震可靠度设计和分析用的随机地震输入模型[J].地震工程和工程振动,1998,18(4):76―81.Du Xiuli.A random seismic input model used in seismic reliability design and analysis of hydraulic buildings[J].Earthquake Engineering and Engineering Vibration,1998,18(4):76―81.(in Chinese)
[2]德国“Li-Kuk”设计联营体,中国长江三峡工程开发总公司.长江三峡工程升船机-阶段B-设计报告[R].内部资料,2004.German Lahmeyer International(LI)-Krebs Und Kiefer(KUK)Joint Venture,China Three Gorges Project Corporation(CTGPC).Three gorges project ship lift―phase B―design Report[R].Inside Information,2004.(in Chinese)
[3]陈清军,王汉东.地震作用下大型升船机结构的响应特征分析[J].振动与冲击,2005,24(4):52―55.Chen Qingjun,Wang Handong.Analysis on the response of large-scale ship-lifting structure under aseismic loads[J].Journal of Vibration and Shock,2005,24(4):52―55.(in Chinese)
[4]陈清军,王汉东.升船机结构抗震可靠度分析中若干问题的探讨[J].力学季刊,2003,24(3):313―318.Chen Qingjun,Wang Handong.Study of some seismic reliability analysis problems of ship-lifter tower structure[J].Chinese Quarterly of Mechanics,2003,24(3):313―318.(in Chinese)
[5]肖帕(美).结构动力学:理论及其在地震工程中的应用[M].第2版-影印本.北京:清华大学出版社,2005.Anil K Chopra(USA).Dynamics of structures:Theory and applications to earthquake engineering[M].Second edition-Photostat copy.Beijing:Tsinghua University Press,2005.(in Chinese)
[6]李桂青,李秋胜.工程结构时变可靠度理论及其应用[M].北京:科学出版社,2001.Li Guiqing,Li Qiusheng.Time dependent structural reliability:Theory and application[M].Beijing:Science Press,2001.(in Chinese)
[7]Housner G W.Characteristic of strong-motion earthquake[J].Bulletin of the Seismological Society of America(BSSA),1947,37(l):19―31.
[8]欧进萍,牛荻涛,杜修力.设计用随机地震动的模型及其参数确定[J].地震工程与工程振动,1991,11(3):45―54.Ou Jinping Niu Ditao,Du Xiuli.Random earthquake ground motion model and its parameter determination used in a seismic design[J].Earthquake Engineering and Engineering Vibration,1991,11(3):45―54.(in Chinese)
[9]Kanai K.An empirical formula for the spectrum of strong earthquake motions[J].Bulletin of the Earthquake Research Institute,Tokyo University,1961,39:85―95.
[10]胡聿贤,周锡元.弹性体系在平稳和平稳化地面运动下的反应[R].地震工程研究报告集(第1集).北京:科学出版社,1962:33―35.Hu Yuxian,Zhou Xiyuan.The response of elastic system under stationary ground motion[R].The Research Report Series on Earthquake Engineering(Volume1).Beijing:Science Press,1962:33―35.(in Chinese)
[11]克拉夫R,彭津J.结构动力学[M].第2版.王光远,译.北京:高等教育出版社,2006.Clough R,Penzien J.Dynamics of structures[M].2nd Ed.Translate by Wang Guangyuan.Beijing:Higher Education Press,2006.(in Chinese)
[12]杜修力,陈厚群.地震动随机模拟及其参数确定方法[J].地震工程和工程振动,1994,14(4):1―5.Du Xiuli,Chen Houqun.Random simulation and its parameter determination method of earthquake ground motion[J].Earthquake Engineering and Engineering Vibration,1994,14(4):1―5.(in Chinese)
[13]杜修力.水工建筑物抗震可靠度设计和分析用的随机地震输入模型[J].地震工程和工程振动,1998,18(4):76―81.Du Xiuli.A random seismic input model used in seismic reliability design and analysis of hydraulic buildings[J].Earthquake Engineering and Engineering Vibration,1998,18(4):76―81.(in Chinese)
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