小半径城市高架曲线梁桥地震动响应研究
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摘要
针对城市高架小半径曲线梁桥弯扭耦合严重、地震危害明显的特点,对武汉新站小半径曲线梁桥有效的动力计算模型进行了探讨,比较了单根梁模型、板壳模型和脊梁模型在模拟小半径曲线桥时的准确性和精度。在脊梁模型的基础上,基于时程分析方法,采用三向地震波同时输入方式,分析了小半径曲线桥的动力特性及其地震响应的主要影响因素。分析结果表明:脊梁模型是对小半径曲线桥进行动力分析的有效实用方法;后续结构、桩-土-桥的相互作用、桥墩刚度及支座偏心等敏感因素对小半径曲线桥的地震响应有较大的影响,计算分析时应给予足够重视。
Aiming at severe bending-torsion coupling and noticeable earthquake damage of a small-radius curved bridge in urban viaducts,the reasonable and effective dynamic FE models of the bridge were discussed.The accuracy and validity of three models including shell element model,single beam one and spine-like beam one were compared.On the basis of spine-like beam model,the time-history analysis method and multiple earthquake excitations were adopted,with those the dynamic properties and the dominant seismic influencing factors of the small-radius curved bridge were analyzed.The analysis results indicated that the spine-like beam model can be regarded as an effective and practical method when performing dynamic analysis of small-radius curved bridge;besides,the adjacent structure,pile-soil-bridge structure interaction,pier rigidity and support eccentricity have greater influences on the bridge,these factors should be paid enough attention to during design and analysis.
Aiming at severe bending-torsion coupling and noticeable earthquake damage of a small-radius curved bridge in urban viaducts,the reasonable and effective dynamic FE models of the bridge were discussed.The accuracy and validity of three models including shell element model,single beam one and spine-like beam one were compared.On the basis of spine-like beam model,the time-history analysis method and multiple earthquake excitations were adopted,with those the dynamic properties and the dominant seismic influencing factors of the small-radius curved bridge were analyzed.The analysis results indicated that the spine-like beam model can be regarded as an effective and practical method when performing dynamic analysis of small-radius curved bridge;besides,the adjacent structure,pile-soil-bridge structure interaction,pier rigidity and support eccentricity have greater influences on the bridge,these factors should be paid enough attention to during design and analysis.
引文
[1]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):42-48.
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[3]Chang P C,Heins C P.Seismic study of curved bridges using the rayleigh-ritzmethod[J].Computers and Structures,1985,21(6):1095-1104.
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[6]宋旭明,戴公连,曾庆元.自锚式悬索桥地震响应及减震控制分析[J].中南大学学报(自然科学版),2009,40(4):1079-1085.
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[13]范立础,李建中,王君杰.高架桥梁抗震设计[M].北京:人民交通出版社,2001.
[14]Malhotra P K.Dynamics of seismic pounding at expansion joints of concrete bridges[J].Journal of Engineering Mechanics,1998,124(7):794-802.
[15]王军文,张运波,李建中,等.地震动行波效应对连续梁桥纵向地震碰撞反应的影响[J].工程力学,2007,24(11):100-105.
[2]魏双科,李鸿晶,罗寒松,等.立交桥曲线箱梁动力分析模型[J].地震工程与工程振动,2006,26(4):168-174.
[3]Chang P C,Heins C P.Seismic study of curved bridges using the rayleigh-ritzmethod[J].Computers and Structures,1985,21(6):1095-1104.
[4]袁万城,王玉贵,杨玉民.曲线梁桥空间地震反应分析[A].第十二届全国桥梁学术会议论文集[C].上海:同济大学出版社,1996,585-590.
[5]聂利英,李建中,胡世德,等.曲线梁桥非线性分析及抗震性能评估[J].同济大学学报,2004,32(10):1360-1364.
[6]宋旭明,戴公连,曾庆元.自锚式悬索桥地震响应及减震控制分析[J].中南大学学报(自然科学版),2009,40(4):1079-1085.
[7]魏双科.曲线梁桥的固有振动特性及地震反应分析[D].南京:南京工业大学,2006.
[8]李国豪,石洞,Heins C P.曲梁桥地震分析的有限单元法[J].同济大学学报(自然科学版),1984,23(1):1-21.
[9]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[10]中华人民共和国交通部,JTJ004-89.公路工程抗震设计规范[S].北京:人民交通出版社,1990.
[11]全伟,李宏男.曲线桥多维地震时程分析主方向研究[J].振动与冲击,2008,27(8):20-24.
[12]曾敏.小半径曲线梁桥地震响应分析及减隔震研究[D].长沙:中南大学土木建筑学院,2009.
[13]范立础,李建中,王君杰.高架桥梁抗震设计[M].北京:人民交通出版社,2001.
[14]Malhotra P K.Dynamics of seismic pounding at expansion joints of concrete bridges[J].Journal of Engineering Mechanics,1998,124(7):794-802.
[15]王军文,张运波,李建中,等.地震动行波效应对连续梁桥纵向地震碰撞反应的影响[J].工程力学,2007,24(11):100-105.
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