大跨连续梁桥桩基础的减隔震分析
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摘要
以中宁和中卫黄河公路大桥为背景,采用铅芯橡胶支座代替普通支座,建立了隔震和非隔震连续梁桥有限元模型.并通过选取合理强震记录作为地震输入,研究了铅芯橡胶支座对大跨连续梁桥桩基础地震响应的影响,从中可知:(1)铅芯橡胶支座可使桩基顶部的弯矩和剪力明显减少,进而保证地震作用下桩基的安全;(2)铅芯橡胶支座使剪力和弯矩在不同桥墩间的分配趋于均匀,在使用相同桩基的情况下,减少了强度的浪费.可见,铅芯橡胶支座可改善桩基受力,并可优化桩基设计.
By using FEA software,analysis models of seismically isolated and non-isolated continuous bridges are established for Zhongning and Zhongwei Yellow River highway bridge. And the effect of LRB for seismic response of this bridge is analysised by consideering force,energy and displacement under the function of the reasonably chosen seismic motion. The results indicate that the natual period of seismically isolated bridge can be prolonged to avoid the principal period of ground. Meanwhile,the seismic energy of structure can be efficiently consumed by the hysteretic energy dissipation of lead rubber bearing. So the response of bridge structure can be reduced. The decrease of the structural force and moment is benefic for seismic design by using LRB.
By using FEA software,analysis models of seismically isolated and non-isolated continuous bridges are established for Zhongning and Zhongwei Yellow River highway bridge. And the effect of LRB for seismic response of this bridge is analysised by consideering force,energy and displacement under the function of the reasonably chosen seismic motion. The results indicate that the natual period of seismically isolated bridge can be prolonged to avoid the principal period of ground. Meanwhile,the seismic energy of structure can be efficiently consumed by the hysteretic energy dissipation of lead rubber bearing. So the response of bridge structure can be reduced. The decrease of the structural force and moment is benefic for seismic design by using LRB.
引文
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[6]RAMALLO J C,JOHNSON E A,SPENCER B F.“Smart”base isolation systems[J].Journal of Engineering Mechanics,2002,128(10):1088-1099.
[7]HWANG J S,SHENG I H.Effective stiffness and equivalent damping of base-isolated bridges[J].Journal of Structural Engineering,1993,119(10):3094-3101.
[8]CHAUDHARY M T A,MASATO A,FUJINO Y.Performance evaluation of base-isolated Yama-age bridge with high damping rubber bearings using recorded seismic data[J].Engineerlng Structures,2001,23:902-910.
[9]JANGID R S.Seismic response of isolated bridges[J].Journal of Bride Engineering,2004,9(2):156-166
[10]范立础,王志强.大跨度桥梁隔震设计[M].北京:北京人民交通出版社,2001.
[11]陈水生.高架桥梁地震响应磁流变阻尼器(MR)半主动控制[J].长安大学学报:自然科学版,2003,23(6):40-43.
[12]CHEN Shui-sheng.Magneto rheological(MR)dampers semi-active control of earthquake response for e1-evated bridge[J].Journal of chang’an University:Natural Science Edition,2003,23(6):40-43.
[13]王丽,阎贵平,孙立.LRB隔震桥梁的减震效果分析[J].工程力学,2003,20(5):124-129.
[14]GB 18306—2001.中国地震动参数区划图[S].北京:中国标准出版社,2001.
[15]重庆交通科研设计院.JTG/TB 02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[2]HWANG J S,SHENG L H.Equivalent Elastic Seismic Analysis of Base2iso2lated Bridges With Lead2rubber Bearing[J].Engineering structures,1994,16(3):201-209.
[3]HWANG J S,CHIOU J M.An Equivalen Linear Model of Lead2rubber Seismic Isolation Bearings[J].Engineering Structures,1996,18(7):528-536.
[4]HWANG J S,CHANG K C,TSAI M H.Composite damping ratio of seismically isolated regular bridges[J].Engineering Structures,1997,19(1):55-62.
[5]TURKINGTON D H,CARR A J,COOKE N,et al.Design method for bridges on lead rubber bearings[J].Journal of Structural Engineering,1989,115(12):3001-3033.
[6]RAMALLO J C,JOHNSON E A,SPENCER B F.“Smart”base isolation systems[J].Journal of Engineering Mechanics,2002,128(10):1088-1099.
[7]HWANG J S,SHENG I H.Effective stiffness and equivalent damping of base-isolated bridges[J].Journal of Structural Engineering,1993,119(10):3094-3101.
[8]CHAUDHARY M T A,MASATO A,FUJINO Y.Performance evaluation of base-isolated Yama-age bridge with high damping rubber bearings using recorded seismic data[J].Engineerlng Structures,2001,23:902-910.
[9]JANGID R S.Seismic response of isolated bridges[J].Journal of Bride Engineering,2004,9(2):156-166
[10]范立础,王志强.大跨度桥梁隔震设计[M].北京:北京人民交通出版社,2001.
[11]陈水生.高架桥梁地震响应磁流变阻尼器(MR)半主动控制[J].长安大学学报:自然科学版,2003,23(6):40-43.
[12]CHEN Shui-sheng.Magneto rheological(MR)dampers semi-active control of earthquake response for e1-evated bridge[J].Journal of chang’an University:Natural Science Edition,2003,23(6):40-43.
[13]王丽,阎贵平,孙立.LRB隔震桥梁的减震效果分析[J].工程力学,2003,20(5):124-129.
[14]GB 18306—2001.中国地震动参数区划图[S].北京:中国标准出版社,2001.
[15]重庆交通科研设计院.JTG/TB 02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
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