地震动空间相干效应对大跨度斜拉桥随机地震反应的影响
|
摘要
随着斜拉桥跨度的增大,地震动空间效应对结构地震反应的影响成为新的研究课题。基于随机振动理论,以苏通长江公路大桥为背景,分析地震动空间相干效应对大跨度斜拉桥地震响应的影响规律。研究表明:考虑地震动相干效应后,结构的内力和位移响应明显增大,且相干效应对主梁和索塔内力与位移的影响程度及规律也不尽相同,须区别对待分析。由此得出结论,对大跨度斜拉桥进行随机地震响应分析时,必须考虑地震动的空间相干效应。
With the growth of the main span about the cable-stayed bridges,the effect of spatial coherence of earthquake motions on the spatial structures is a new research topic.Based on stochastic vibration theory and combined with Sutong Yangtze River Highway Bridge,the stochastic seismic response of a super-long-span cable-stayed bridge under the seismic motion with considering the spatial coherency effect is developed.The obtained results indicate that the internal force and displacement are influenced obviously by the partial coherence effect than uniform excitation.For different responses of internal force and displacement of the girder and the tower,the impact and the rules are different for the seismic motion with considering the spatial coherence effect.Therefore,in view of different cases,the analyses have different results.As a result,the partial coherence effect of the seismic motion must be considered in the stochastic seismic response analysis of the long-span cable-stayed bridges.
With the growth of the main span about the cable-stayed bridges,the effect of spatial coherence of earthquake motions on the spatial structures is a new research topic.Based on stochastic vibration theory and combined with Sutong Yangtze River Highway Bridge,the stochastic seismic response of a super-long-span cable-stayed bridge under the seismic motion with considering the spatial coherency effect is developed.The obtained results indicate that the internal force and displacement are influenced obviously by the partial coherence effect than uniform excitation.For different responses of internal force and displacement of the girder and the tower,the impact and the rules are different for the seismic motion with considering the spatial coherence effect.Therefore,in view of different cases,the analyses have different results.As a result,the partial coherence effect of the seismic motion must be considered in the stochastic seismic response analysis of the long-span cable-stayed bridges.
引文
[1]李建民,冯际安,金大勇.“5.12”汶川地震灾区桥梁典型损毁情况与原因浅析[J].城市道桥与防洪,2008,8:26-18.Li Jianmin,Feng Jian,Jin Dayong.Elementary analysis of typical destroying condition and reason of bridges in"5.12"Wenchuan Earthquakearea[J].Urban Roads Bridges&Flood Control,2008,8:26-18.
[2]王克海,孙永红,韦韩,等.汶川地震后对我国结构工程抗震的几点思考[J].公路交通科技,2008,25(11):54-59.Wang Kehai,Sun Yonghong,Wei Han,et al.Comments on seismic strengthening for structural engineering in China after Wenchuan Earthquake[J].Journal of Highway and Transportation Research and Development,2008,25(11):54-59.
[3]胡秀杰,撒卫昌,贺震.汶川地震震害调查及分析[J].陕西建筑,2008,11:17-20.Hu Xiujie,Sa Weichang,He Zhen.Wenchuan Earthquake investigation and analysis of seismic damage[J].Shaanxi Architecture,2008,11:17-20.
[4]李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008,29(4):10-19.Li Hongnan,Xiao Shiyun,Huo Linsheng.Damage investigation and analysis of engineering structures in the Wenchuan Earthquake[J].Journalof Building Structures,2008,29(4):10-19.
[5]尹海军,徐雷,申跃奎,等.汶川地震中桥梁损伤机理探讨[J].西安建筑科技大学学报:自然科学版,2008,40(5):672-676.Yin Haijun,Xu Lei,Shen Yuekui,et al.Study on the seismic damages to the bridges in Wenchuan Earthquake[J].Journal of Xi’an Universityof Architecture&Technology(Natural Science Edition),2008,40(5):672-676.
[6]杜修力,陈厚群.地震动随机模拟及其参数确定方法[J].地震工程与工程振动,1994,14(4):1-5.Du Xiuli,Chen Houqun.Random simulation of earthquake ground motion and its parameter determination method[J].Journal of Earthquake En-gineering and Engineering Vibration,1994,14(4):1-5.
[7]王光远,程耿东,邵卓民,等.抗震结构的最优设防烈度与可靠度[M].北京:科学出版社,1999.Wang Guangyuan,Cheng Gengdong,Shao Zhuomin,Chen Houqun.Most Superior Intensity and Reliability of Earthquake Resistant Structurs[M].Beijing:Science Press Co.,Ltd,1999.
[8]屈铁军,王君杰,王前信.空间变化的地震动功率谱的实用模型[J].地震学报,1996,18(1):55-62.Qu Tiejun,Wang Junjie,Wang Qianxin.Spatial variation of ground motion power spectrum model[J].Acta seismologica sinica,1996,18(1):55-62.
[9]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].地震工程与工程振动,1998,18(4):76-81.Du Xiuli.A random seismic input model used in seismic reliability design and analysis of hydraulic buildings[J].Journal of Earthquake Engi-neering and Engineering Vibration,1998,18(4):76-81.
[10]武芳文.大跨度斜拉桥随机地震响应分析及其动力可靠度研究[D].成都:西南交通大学,2008.Wu Fangwen.Study of long span cable-stayed bridges stochastic seismic response and dynamic reliability[D].Chengdu:Southwest Jiaotong Uni-versity,2008.
[11]Zerva A..Lifeline response to spartially variable ground motion[J].Earthquake Engineering and Structural Dynamics,1988,17(7):361-379.
[12]Zerva A.Effect of spartial variablity and propagation of seismic ground motion on the response of multiply supported structures[J].ProbabliisticEngineering Mechanics,1991,12(7):217-226.
[2]王克海,孙永红,韦韩,等.汶川地震后对我国结构工程抗震的几点思考[J].公路交通科技,2008,25(11):54-59.Wang Kehai,Sun Yonghong,Wei Han,et al.Comments on seismic strengthening for structural engineering in China after Wenchuan Earthquake[J].Journal of Highway and Transportation Research and Development,2008,25(11):54-59.
[3]胡秀杰,撒卫昌,贺震.汶川地震震害调查及分析[J].陕西建筑,2008,11:17-20.Hu Xiujie,Sa Weichang,He Zhen.Wenchuan Earthquake investigation and analysis of seismic damage[J].Shaanxi Architecture,2008,11:17-20.
[4]李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008,29(4):10-19.Li Hongnan,Xiao Shiyun,Huo Linsheng.Damage investigation and analysis of engineering structures in the Wenchuan Earthquake[J].Journalof Building Structures,2008,29(4):10-19.
[5]尹海军,徐雷,申跃奎,等.汶川地震中桥梁损伤机理探讨[J].西安建筑科技大学学报:自然科学版,2008,40(5):672-676.Yin Haijun,Xu Lei,Shen Yuekui,et al.Study on the seismic damages to the bridges in Wenchuan Earthquake[J].Journal of Xi’an Universityof Architecture&Technology(Natural Science Edition),2008,40(5):672-676.
[6]杜修力,陈厚群.地震动随机模拟及其参数确定方法[J].地震工程与工程振动,1994,14(4):1-5.Du Xiuli,Chen Houqun.Random simulation of earthquake ground motion and its parameter determination method[J].Journal of Earthquake En-gineering and Engineering Vibration,1994,14(4):1-5.
[7]王光远,程耿东,邵卓民,等.抗震结构的最优设防烈度与可靠度[M].北京:科学出版社,1999.Wang Guangyuan,Cheng Gengdong,Shao Zhuomin,Chen Houqun.Most Superior Intensity and Reliability of Earthquake Resistant Structurs[M].Beijing:Science Press Co.,Ltd,1999.
[8]屈铁军,王君杰,王前信.空间变化的地震动功率谱的实用模型[J].地震学报,1996,18(1):55-62.Qu Tiejun,Wang Junjie,Wang Qianxin.Spatial variation of ground motion power spectrum model[J].Acta seismologica sinica,1996,18(1):55-62.
[9]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].地震工程与工程振动,1998,18(4):76-81.Du Xiuli.A random seismic input model used in seismic reliability design and analysis of hydraulic buildings[J].Journal of Earthquake Engi-neering and Engineering Vibration,1998,18(4):76-81.
[10]武芳文.大跨度斜拉桥随机地震响应分析及其动力可靠度研究[D].成都:西南交通大学,2008.Wu Fangwen.Study of long span cable-stayed bridges stochastic seismic response and dynamic reliability[D].Chengdu:Southwest Jiaotong Uni-versity,2008.
[11]Zerva A..Lifeline response to spartially variable ground motion[J].Earthquake Engineering and Structural Dynamics,1988,17(7):361-379.
[12]Zerva A.Effect of spartial variablity and propagation of seismic ground motion on the response of multiply supported structures[J].ProbabliisticEngineering Mechanics,1991,12(7):217-226.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心