大跨度悬索桥行波激励地震反应分析
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摘要
为探讨大跨度悬索桥梁抗震设计理论问题,利用基于大质量法的多支承激励运动方程,研究非线性多支承激励地震响应,分析桩-土-结构相互作用对动力特性和地震反应的影响,以及行波效应对地震反应的影响。分析表明,主塔为嵌岩桩时,考虑桩基础的桩-土-结构相互作用后会使结构的内力反应减小,行波效应对结构内力反应影响不大,加劲梁与边梁在主塔下横梁支承处的纵向相对位移可达0.6 m。
In order to investigate theoretical issues in wind and earthquake resistance design of large-span suspension bridges,this paper studies the response of nonlinear multi-support excitation to earthquake by means of motion equations of multi-support excitation based on the large-mass method(LMM),and analyzes impacts of interactions of pile-soil-structure on dynamic properties and seismic response and influences of traveling wave effect on seismic response.In accordance with the analysis of the paper,the traveling wave effect does not have great influence on response of internal force of structure since the interactions of pile-soil structure in consideration of pile foundation will reduce the response of internal force of structure when the socketed pile is employed for main tower,and the longitudinal relative displacement between reinforced beam and side beam at supporting place of lower transverse beam of main tower can be up to 0.6 m.
In order to investigate theoretical issues in wind and earthquake resistance design of large-span suspension bridges,this paper studies the response of nonlinear multi-support excitation to earthquake by means of motion equations of multi-support excitation based on the large-mass method(LMM),and analyzes impacts of interactions of pile-soil-structure on dynamic properties and seismic response and influences of traveling wave effect on seismic response.In accordance with the analysis of the paper,the traveling wave effect does not have great influence on response of internal force of structure since the interactions of pile-soil structure in consideration of pile foundation will reduce the response of internal force of structure when the socketed pile is employed for main tower,and the longitudinal relative displacement between reinforced beam and side beam at supporting place of lower transverse beam of main tower can be up to 0.6 m.
引文
[1]刘传文,徐升桥.丫髻沙大桥主桥的地震反应[J].铁道标准设计,2000(12):8-11.
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[5]刘春城,张哲,石磊.虚拟激励法在自锚式悬索桥竖向地震反应分析中的应用[J].东南大学学报:自然科学版,2003,33(4):522-525.
[6]白宗琨.基于空间变化特性的地震动模拟及悬索桥地震反应分析[D].大连:大连理工大学,2007.
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[10]杨孟刚,胡建华,陈政清.独塔自锚式悬索桥地震响应分析[J].中南大学学报:自然科学版,2005,36(1):133-137.
[2]袁万城,胡世德,范立础.悬索桥抗震分析方法[C]//土木工程学会第11届年会论文集.北京:人民交通出版社,1994.
[3]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
[4]樊珂.大跨度结构多维多点地震响应试验研究与理论分析[D].北京:北京工业大学,2008.
[5]刘春城,张哲,石磊.虚拟激励法在自锚式悬索桥竖向地震反应分析中的应用[J].东南大学学报:自然科学版,2003,33(4):522-525.
[6]白宗琨.基于空间变化特性的地震动模拟及悬索桥地震反应分析[D].大连:大连理工大学,2007.
[7]陈海波.大跨度悬索桥考虑行波效应的地震分析[J].工程与建设,2010,24(4):500-502.
[8]柯红军,李传习.基于Ansys的自锚式悬索桥有限元建模和分析方法[J].交通与计算机,2008,26(5):131-134.
[9]陈海斌.抗震分析中的多点激励问题[J].中国水运,2006,8(11):106-107.
[10]杨孟刚,胡建华,陈政清.独塔自锚式悬索桥地震响应分析[J].中南大学学报:自然科学版,2005,36(1):133-137.
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