近断层强震下高速公路RC连续梁桥的变形性能
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摘要
为探讨近断层强震下桥梁结构的大震变形性能,以某靠近活动断层的高速公路RC连续梁桥为对象进行了动力分析。挑选中、美两国典型近断层地震动记录,并构造人工地震波作为输入,建立了桥梁精细化有限元模型。采用非线性动力时程分析方法研究了强震水平下桥梁关键部位的变形性能,并进行了定量评估。研究表明:地震动频谱特性,尤其是近断层地震动的脉冲效应,会显著增大桥梁结构的地震响应;强震下,支座是桥梁结构的薄弱环节,但通过支座破坏可耗散一定的地震动能量,从而有效降低桥墩塑性破坏的风险,因而可通过提高支座的塑性变形能力,增强其分担地震动总耗能的能力和效率。
In order to explore the seismic deformation properties of bridge structure under strong near-fault earthquake ground motion,a RC continuous girder bridge of expressway close to active fault is introduced for dynamic analysis.Typical near-fault earthquake records in China and the U.S.are selected and artificial seismic waves are constructed as input to establish a refined bridge finite element model.The deformation property of critical components of the bridge under strong earthquake is studied by nonlinear dynamic time history analysis method,and quantitative assessment is performed.The research result indicates that(1) the earthquake dynamic spectrum characteristics,especially pulse effect of near-fault earthquake,will significantly increase the seismic response of bridge structure;(2) bearing is the weak part of bridge under strong earthquake,and earthquake energy can be dissipated through bearing damage,therefore the risk of pier plastic damage could be reduced effectively,so the plastic deformation ability of bearing could be improved to enhance its energy consumption capability and efficiency.
In order to explore the seismic deformation properties of bridge structure under strong near-fault earthquake ground motion,a RC continuous girder bridge of expressway close to active fault is introduced for dynamic analysis.Typical near-fault earthquake records in China and the U.S.are selected and artificial seismic waves are constructed as input to establish a refined bridge finite element model.The deformation property of critical components of the bridge under strong earthquake is studied by nonlinear dynamic time history analysis method,and quantitative assessment is performed.The research result indicates that(1) the earthquake dynamic spectrum characteristics,especially pulse effect of near-fault earthquake,will significantly increase the seismic response of bridge structure;(2) bearing is the weak part of bridge under strong earthquake,and earthquake energy can be dissipated through bearing damage,therefore the risk of pier plastic damage could be reduced effectively,so the plastic deformation ability of bearing could be improved to enhance its energy consumption capability and efficiency.
引文
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[10]王东升,孙治国,郭迅,等.汶川地震桥梁震害经验及抗震研究若干新进展[J].公路交通科技,2011,28(10):44-53.WANG Dong-sheng,SUN Zhi-guo,GUO XUN,et al.Lessons Learned from Wenchuan Seismic Damages and Recent Research on Seismic Design of Highway Bridges[J].Journal of Highway and Transportation Research and Development,2011,28(10):44-53.
[11]慎丹.近场地震作用下RC梁式桥抗震设计几个关键问题的研究[D].北京:北京交通大学,2011.SHEN Dan.Research of Several Key Problems on Seismic Design of RC Girder Bridges Near Active Fault[D].Beijing:Beijing Jiaotong University,2011.
[12]JTG/TB02-01—2008,公路桥梁抗震设计细则[S].JTG/TB02-01—2008,Guidelines for Seismic Design of Highway Bridges[S].
[2]MAKRIS N,CHANG S P.Effect of Viscous,Viscoplasticand Friction Damping on the Response of Seismic IsolatedStructures[J].Earthquake Engineering and StructuralDynamics,2000,29(1):85-107.
[3]杜修力,韩强,李忠献,等.5.12汶川地震中山区公路桥梁震害及启示[J].北京工业大学学报,2008,34(12):1270-1279.DU Xiu-li,HAN Qiang,LI Zhong-xian,et al.TheSeismic Damage of Bridges in the 2008 WenchuanEarthquake and Lessons from Its Damage[J].Journal ofBeijing University of Technology,2008,34(12):1270-1279.
[4]王克海,孙永红,韦韩,等.汶川地震后对我国结构工程抗震的几点思考[J].公路交通科技,2008,25(11):54-59.WANG Ke-hai,SUN Yong-hong,WEI Han,et al.Comments on Seismic Strengthening for StructuralEngineering in China after Wenchuan Earthquake[J].Journal of Highway and Transportation Research andDevelopment,2008,25(11):54-59.
[5]李鸿晶,陆鸣,温增平,等.汶川地震桥梁震害的特征[J].南京工业大学学报:自然科学版,2009,31(1):24-29.LI Hong-jing,LU Ming,WEN Zeng-ping,et al.Characteristics of Bridge Damages in WenchuanEarthquake[J].Journal of Nanjing University ofTechnology:Natural Science Edition,2009,31(1):24-29.
[6]王东升,孙治国,李晓莉,等.汶川大地震曲线梁桥震害及破坏机理分析[J].防灾减灾工程学报,2010,30(5):572-579.WANG Dong-sheng,SUN Zhi-guo,LI Xiao-li,et al.Seismic Damage Investigation and Failure MechanismAnalysis of Curved Bridges in Wenchuan Earthquake[J].Journal of Disaster Prevention and Mitigation Engineering,2010,30(5):572-579.
[7]祝兵,崔圣爱,喻明秋.汶川地震跨断裂带小鱼洞大桥地震破坏分析[J].公路交通科技,2010,27(1):78-83.ZHU Bing,CUI Sheng-ai,YU Ming-qiu.Analysis ofSeismic Failure on Xiaoyudong Bridge across Fault Zone inWenchuan Earthquake[J].Journal of Highway andTransportation Research and Development,2010,27(1):78-83.
[8]贡金鑫,张勤,王雪婷.从汶川地震中桥梁震害看现行国内外桥梁抗震设计方法(二):抗震设计与构造[J].公路交通科技,2010,27(10):35-47.GONG Jin-xin,ZHANG Qin,WANG Xue-ting.Comparative Study on Bridge Seismic Design Approaches inDifferent Specifications Based on Survey of Disaster inWenchuan Earthquake(2):Seismic Design and Structure[J].Journal of Highway and Transportation Research andDevelopment,2010,27(10):35-47.
[9]贡金鑫,张勤,王雪婷.从汶川地震中桥梁震害看现行国内外桥梁抗震设计方法(一):抗震设防标准和抗震计算[J].公路交通科技,2010,27(9):44-54.GONG Jin-xin,ZHANG Qin,WANG Xue-ting.Comparative Study on Bridge Seismic Design Approachesin Different Specifications Based on Survey of Disaster inWenchuan Earthquake(1):Seismic Fortification Criterionand Earthquake Response Calculation[J].Journal ofHighway and Transportation Research and Development,2010,27(9):44-54.
[10]王东升,孙治国,郭迅,等.汶川地震桥梁震害经验及抗震研究若干新进展[J].公路交通科技,2011,28(10):44-53.WANG Dong-sheng,SUN Zhi-guo,GUO XUN,et al.Lessons Learned from Wenchuan Seismic Damages and Recent Research on Seismic Design of Highway Bridges[J].Journal of Highway and Transportation Research and Development,2011,28(10):44-53.
[11]慎丹.近场地震作用下RC梁式桥抗震设计几个关键问题的研究[D].北京:北京交通大学,2011.SHEN Dan.Research of Several Key Problems on Seismic Design of RC Girder Bridges Near Active Fault[D].Beijing:Beijing Jiaotong University,2011.
[12]JTG/TB02-01—2008,公路桥梁抗震设计细则[S].JTG/TB02-01—2008,Guidelines for Seismic Design of Highway Bridges[S].
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