纵向限位连续梁桥分散减震效果参数分析
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摘要
连续梁桥的地震作用大多由固定支座墩承担,为均衡地震作用在各墩间的分配、降低固定墩的地震反应,可在活动墩上设置限位挡块作为分散减震措施,使活动墩共同承担地震作用。利用有约束的刚体碰撞模型分析了梁部结构与限位装置碰撞时阻尼比参数的取值方法。考虑活动支座的摩擦非线性、限位装置的接触及材料非线性和钢筋混凝土桥墩的材料非线性,建立了设置限位装置的连续梁桥考虑接触碰撞的全桥动力分析模型,并分为限位装置弹性和弹塑性两个模型。采用非线性时程分析方法,对限位装置的初始间隙和刚度对连续梁桥分散减震效果的影响进行了参数分析,结果表明,可通过有限元分析合理调整限位装置设计参数,使限位装置对连续梁桥的分散减震效果最佳。
For continuous beam bridges,most of the earthquake loading was borne by the fixed pier.In order to deduce the sesmic response of the fixed pier and to make the movable support pier bear some earthquake loading and to distribute the earthquake loading to all the piers,the restrainers can be used as the vibration dissipation devices and are installed at the movable piers.The damping ratio for the contact and pounding between the beam and the restrainers was determined by the analysis of the pounding model of constrained rigid body.The longitudinal pounding model for continuous beam bridges with restrainers was established.The friction nonlinearity of the movable support and the contact and material nonlinearity of the restrainers and the material nonlinearity of the reinforced concrete pier were all involved in the finite element model.According to the nonlinear characteristic of the restrainers,two different models were established.The effect of the design parameters,such as initial gap and stiffness of the restrainers,on the vibration dissipation of the continuous beam bridges was analyzed by the nonlinear time-history method.The results indicate that the design parameters of the restrainers can be adjusted according to the nonlinear analysis to take the best vibration dissipation effects.
For continuous beam bridges,most of the earthquake loading was borne by the fixed pier.In order to deduce the sesmic response of the fixed pier and to make the movable support pier bear some earthquake loading and to distribute the earthquake loading to all the piers,the restrainers can be used as the vibration dissipation devices and are installed at the movable piers.The damping ratio for the contact and pounding between the beam and the restrainers was determined by the analysis of the pounding model of constrained rigid body.The longitudinal pounding model for continuous beam bridges with restrainers was established.The friction nonlinearity of the movable support and the contact and material nonlinearity of the restrainers and the material nonlinearity of the reinforced concrete pier were all involved in the finite element model.According to the nonlinear characteristic of the restrainers,two different models were established.The effect of the design parameters,such as initial gap and stiffness of the restrainers,on the vibration dissipation of the continuous beam bridges was analyzed by the nonlinear time-history method.The results indicate that the design parameters of the restrainers can be adjusted according to the nonlinear analysis to take the best vibration dissipation effects.
引文
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[14]李建中,范立础.非规则梁桥纵向地震反应及碰撞效应[J].土木工程学报,2005,38(1):84-90.LI Jianzhong,FAN Lichu.Longitudinal seismic response and pounding effects of girder bridges with unconventional configurations[J].ChinaCivil Engineering Journal,2005,38(1):84-90.(in Chinese)
[2]王克海.桥梁抗震研究[M].北京:中国铁道出版社,2007.WANG Kehai.Research on aseismic analysis of bridge[M].Beijing:China Railway Press,2007.(in Chinese)
[3]范立础,李建中.汶川桥梁震害分析与抗震设计对策[J].公路,2009(5):122-128.FAN Lichu,LI Jianzhong.Earthquake induced damage analysis of bridges in Wenchuan earthquake and designing countermeasures[J].High-way,2009(5),122-128.(in Chinese)
[4]谢旭.桥梁结构地震响应分析与抗震设计[M].北京:人民交通出版社,2006.XIE Xu.Seismic response and earthquake resistant design of bridges[M].Beijing:China Communications Press,2006.(in Chinese)
[5]王志强,葛继平.粘滞阻尼器和Lock-up装置在连续梁桥抗震中应用[J].石家庄铁道学院学报,2006,19(1):5-9.WANG Zhiqiang,GE Jiping.Application of viscous damper and lock-up devices in the seismic design of continuous girder bridges[J].Journal ofShijiazhuang Railway Institute,2006,19(1),5-9.(in Chinese)
[6]王常峰.桥梁结构非线性地震反应研究(支座摩擦.限位装置.基础非线性)[D].兰州:兰州交通大学,2010.WANG Changfeng.Research on nonlinear seismic response of bridge structure(friction force at moveable supports.restrainer.nonlinearity offoundation)[D].Lanzhou:Lanzhou Jiaotong University,2010.(in Chinese)
[7]金栋平,胡海岩.碰撞振动与控制[M].北京:科学出版社,2005.JIN Dongping,HU Haiyan.Impacting vibration and control[M].Beijing:Chinese Science Press,2005.(in Chinese)
[8]范立础,聂利英,李建中.地震作用下板式橡胶支座滑动的动力性能分析[J].中国公路学报,2003,16(4):30-35.FAN Lichu,NIE Liying,LI Jianzhong.Dynamic characteristic analysis of laminated rubber bearing sliding under earthquake[J].China Journalof Highway and Transport,2003,16(4),30-35.(in Chinese)
[9]聂利英,李建中,胡世德,等.抗震销的模拟及其对异型板桥抗震性能影响分析[J].地震工程与工程振动,2008,28(2):108-113.NIE Liying,LI Jianzhong,HU Shide,et al.The effects of antiseismic bolt on seismic estimation of heteromorphic bridge and its simulation[J].Journal of Earthquake Engineering and Engineering Vibraition,2008,28(2):108-113.(in Chinese)
[10]李忠献,岳福青,周莉.地震时桥梁碰撞分析的等效Kelvin撞击模型[J].工程力学,2008,25(4):128-133.LI Zhongxian,YUE Fuqing,ZHOU Li.Equivalent Kelvin impact model for pounding analysis of bridges during earthquake[J].Engineering Me-chanics,2008,25(4),128-133.(in Chinese)
[11]高玉峰,蒲黔辉,李晓斌.梁式桥地震碰撞响应及防碰撞与落梁措施研究进展[J].地震工程与工程振动,2011,31(1):80-88.GAO Yufeng,PU Qianhui,LI Xiaobin.State of arts of earthquake induced pounding responses of girder bridges and measures for preventingpounding and span collapse[J].Journal of Earthquake Engineering and Engineering Vibraition,2011,31(1):80-88.(in Chinese)
[12]聂利英,李建中,范立础.地震作用下结构碰撞的模型参数及其影响分析[J].工程力学,2005,22(5):142-146.NIE Liying,LI Jianzhong,FAN Lichu.Selection of pounding analysis parameters and its effects on structure under earthquake[J].EngineeringMechanics,2005,22(5),142-146.(in Chinese)
[13]王军文,李建中,范立础.连续梁桥纵向地震碰撞反应参数研究[J].中国公路学报,2005,18(4):42-47.WANG Junwen,LI Jianzhong,FAN Lichu.Parametric study of longitudinal seismic pounding response for continuous girder bridge[J].ChinaJournal of Highway and Transport,2005,18(4),42-47.(in Chinese)
[14]李建中,范立础.非规则梁桥纵向地震反应及碰撞效应[J].土木工程学报,2005,38(1):84-90.LI Jianzhong,FAN Lichu.Longitudinal seismic response and pounding effects of girder bridges with unconventional configurations[J].ChinaCivil Engineering Journal,2005,38(1):84-90.(in Chinese)
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