活动支座摩擦作用对连续梁桥弹塑性地震反应的影响
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摘要
为研究活动支座摩擦作用对连续梁桥弹塑性地震反应的影响,将活动支座摩擦作用对桥梁结构地震反应的影响分解为摩擦耗能、刚度贡献和运动相互作用3个方面,建立了同时考虑活动支座及桥墩非线性的有限元分析模型,进行了非线性时程反应分析,对支座摩擦作用对桥梁结构的墩底曲率、梁体位移、速度和加速度的影响进行了研究。研究表明,活动支座摩擦作用对桥梁结构的弹塑性地震反应并不是在任何情况下都是有利的,根据分析结果提出了需要考虑活动支座摩擦作用的情况,在非线性时程分析时需要综合考虑结构的自振特性及场地反应谱的影响。对于复杂的桥梁,尤其是固定支座墩和活动支座墩墩高和刚度差异较大的桥梁,在进行抗震分析时需考虑活动支座摩擦作用的影响。
In order to study the effect of friction at movable supports on the elasto-plastic seismic responses of continuous girder bridges,the effect is analyzed from 3 aspects,i.e.,friction energy dissipation and stiffness contribution of the movable supports and the motion-induced interaction between the girder and the movable piers.Finite element models are established considering the friction nonlinearity of the movable supports and the material nonlinearity of the reinforced concrete piers.A nonlinear time-history analysis is performed to analyze the effect of friction at the movable supports on the pier bottom curvature,girder displacement,velocity and acceleration.The results indicate that the friction effect at movable supports on the elasto-plastic seismic response of bridge structure is not always favorable,thus in some cases,the friction at movable supports must be taken into account,and for the nonlinear time-history analysis,the effect of natural vibration characteristics of the bridge and the site response spectrum should also be considered.For some complicated continuous bridges,especially those with the heights and stiffnesses of the fixed pier and the movable pier being significantly different,the friction at movable supports should be considered in seismic analysis.
In order to study the effect of friction at movable supports on the elasto-plastic seismic responses of continuous girder bridges,the effect is analyzed from 3 aspects,i.e.,friction energy dissipation and stiffness contribution of the movable supports and the motion-induced interaction between the girder and the movable piers.Finite element models are established considering the friction nonlinearity of the movable supports and the material nonlinearity of the reinforced concrete piers.A nonlinear time-history analysis is performed to analyze the effect of friction at the movable supports on the pier bottom curvature,girder displacement,velocity and acceleration.The results indicate that the friction effect at movable supports on the elasto-plastic seismic response of bridge structure is not always favorable,thus in some cases,the friction at movable supports must be taken into account,and for the nonlinear time-history analysis,the effect of natural vibration characteristics of the bridge and the site response spectrum should also be considered.For some complicated continuous bridges,especially those with the heights and stiffnesses of the fixed pier and the movable pier being significantly different,the friction at movable supports should be considered in seismic analysis.
引文
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[2]KIM S H,MHA H S,LEE S W.Effects of BearingDamage upon Seismic Behaviors of a multi-span GirderBridge[J].Engineering Structures,2006,28(7):1071-1080.
[3]李加武,卢斌,刘健新.影响桥梁减震性能参数的试验研究[J].郑州大学学报:工学版,2002,23(2):34-36.LI Jia-wu,LU Bin,LIU Jian-xin.Shake TableExperimental Study of the Seism-reducing Behavior ofContinuous-beam Bridges[J].Journal of ZhengzhouUniversity of Technology:Engineering Science Edition,2002,23(2):34-36.
[4]范立础,聂丽英,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 Li-chu,NIE Li-ying,LI Jian-zhong.DynamicCharacteristic Analysis of Laminated Rubber BearingSliding under Earthquake[J].China Journal of Highwayand Transport,2003,16(4):30-35.
[5]杨亮,肖杰,王文欣,等.大跨度连续梁桥的减隔震和延性抗震分析[J].公路交通科技,2011,28(8):73-78.YANG Liang,XIAO Jie,WANG Wen-xin,et al.Analysis of Seismic Isolation and Ductility for Long-spanContinuous Bridges[J].Journal of Highway andTransportation Research and Development,2011,28(8):73-78.
[6]郑越,陈兴冲,戴利民,等.柱式钢筋混凝土桥墩的弹塑性抗震简化计算[J].公路交通科技,2006,23(4):76-79.ZHENG Yue,CHEN Xing-chong,DAI Li-min,et al.Simplified Calculation of Elasto-plastic Performance of RCColumn Bridge Piers[J].Journal of Highway andTransportation Research and Development,2006,23(4):76-79.
[7]王常峰,陈兴冲,朱东生.活动支座摩擦力对桥梁抗震性能的影响参数分析[J].世界地震工程,2005,21(4):82-87.WANG Chang-feng,CHEN Xing-chong,ZHU Dong-sheng.Analysis on the Influence of the Friction Force atthe Movable Supports on the Seismic Performance of aBridge[J].World Information on EarthquakeEngineering,2005,21(4):82-87.
[8]BHASKARARAO A V,JANGID R S.Seismic Analysis ofStructures Connected with Friction Dampers[J].Engineering Structures,2006,28(5):690-703.
[9]聂丽英,李建中,范立础.滑动支座竖向动反力对桥梁结构动力性能的影响[J].同济大学学报:自然科学版,2002,30(11):128-132.NIE Li-ying,LI Jian-zhong,FAN Li-chu.Effects ofDynamic Vertical Resistance Force of Sliding Bearing ofBridges[J].Journal of Tongji University:NaturalScience Edition,2002,30(11):128-132.
[10]王常峰,陈兴冲.竖向地震动对桥梁结构地震反应的影响[J].振动与冲击,2007,26(6):31-35,181.WANG Chang-feng,CHEN Xing-chong.Effect of VerticalExcitation on Seismic Performance of Continuous Bridge[J].Journal of Vibration and Shock,2007,26(6):31-35,181.
[11]叶爱君,胡世德,范立础.桥梁支座抗震性能的模拟分析[J].同济大学学报:自然科学版,2001,29(1):6-9.YE Ai-jun,HU Shi-de,FAN Li-chu.Simulation ofSeismic Behavior for Bridge Bearings[J].Journal ofTongji University:Natural Science Edition,2001,29(1):6-9.
[12]ATES S,BAYRAKTAR A,DUMANOGLU A A.TheEffect of Spatially Varying Earthquake Ground Motions onthe Stochastic Response of Bridges Isolated with FrictionPendulum Systems[J].Soil Dynamics and EarthquakeEngineering,2006,26(1):31-44.
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