大跨度体外预应力钢-混组合结构桥梁的动力特性
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摘要
为研究大跨度体外预应力钢-混凝土组合结构桥梁的动力行为,分析推导了钢-混凝土组合结构桥梁的等效阻尼比的计算公式,深入探讨了组合梁剪力连接件群的抗剪刚度及界面滑移、体外预应力作用效应、下部桩-土相互作用对钢-混凝土组合结构桥梁动力特性的影响。有限元计算及结果表明:组合结构桥梁的等效阻尼比对体系的动力响应影响显著;组合梁剪力钉群的抗剪刚度及体外预应力作用水平对大跨度组合结构桥梁的自振频率均有不同程度的影响,但相对较小;桩-土相互作用对大跨度组合结构桥梁的动力特性影响明显。
In order to investigate the dynamic behavior of long-span steel-concrete composite bridge with external tendons,the formula of equivalent damping ratio on steel-concrete composite bridge is analyzed and derived,the influence of shear stiffness of shear connectors of composite beam,interface slip,effect of external tendons,pile-soil dynamic interaction on the dynamitic property of steel-concrete composite bridge is discussed.The finite element calculation indicates that(1) the equivalent damping ratio of the composite bridge has significant influence on the dynamic response;(2) the shear stiffness of grouped stud shear connectors and the prestressed level of external tendons have different but relatively smaller influence on the nature frequency of long-span composite bridge;(3) the influence of pile-soil dynamic interaction on the structural dynamic response of the composite bridge is obvious.
In order to investigate the dynamic behavior of long-span steel-concrete composite bridge with external tendons,the formula of equivalent damping ratio on steel-concrete composite bridge is analyzed and derived,the influence of shear stiffness of shear connectors of composite beam,interface slip,effect of external tendons,pile-soil dynamic interaction on the dynamitic property of steel-concrete composite bridge is discussed.The finite element calculation indicates that(1) the equivalent damping ratio of the composite bridge has significant influence on the dynamic response;(2) the shear stiffness of grouped stud shear connectors and the prestressed level of external tendons have different but relatively smaller influence on the nature frequency of long-span composite bridge;(3) the influence of pile-soil dynamic interaction on the structural dynamic response of the composite bridge is obvious.
引文
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[15]孙利民,张晨南,潘龙,等.桥梁桩土相互作用的集中质量模型及参数确定[J].同济大学学报,2002,30(4):409-415.SUN Limin,ZHANG Chennan.PAN Long,et al.Lumped-mass Model and Its Parameters for DynamicAnalysis of Bridge Pier-pile-soil System[J].Journal ofTongji University,2002,30(4):409-415.
[16]蒋通,田冶见宏.地基-结构动力相互作用分析方法[M].上海:同济大学出版社,2009:180-188.JIANG Tong,TAJIMI H.Analysis Method of Foundation-structure Dynamic Interaction[M].Shanghai:TongjiUniversity Press,2009:180-188.
[17]李威威,刘伟庆,王曙光,等.基于Simulink的桩-土-结构相互作用反应谱分析[J].世界地震工程,2012,28(1):103-111.LI Weiwei,LIU Weiqing,WANG Shuguang,et al.Response Spectrum Analysis of Pile-soil-structureInteraction Based on Simulink[J].World EarthquakeEngineering,2012,28(1):103-111.
[18]JTG/T B02-01—2008,公路桥梁抗震设计细则[S].JTG/T B02-01—2008,Guidelines for Seismic Design ofHighway Bridges[S].
[2]戚菁菁,蒋丽忠,张传增,等.界面滑移、竖向掀起及剪切变形对钢-混凝土组合连续梁动力性能的影响[J].中南大学学报:自然科学版,2010,41(6):2334-2343.QI Jingjing,JIANG Lizhong,ZHANG Chuanzeng,et al.Effects of Interface Slip,Vertical Uplift and ShearDeformation on Dynamic Behavior of Steel-concreteComposite Continuous Beams[J].Journal of CentralSouth University:Science and Technology Edition,2010,41(6):2334-2343.
[3]王海洋,李亮亮.体外预应力简支梁的动力性能分析[J].公路交通科技,2006,23(1):70-73.WANG Haiyang,LI Liangliang.Dynamic PerformanceAnalysis of Simple Beam with External Prestressing Force[J].Journal of Highway and Transportation Research andDevelopment,2006,23(1):70-73.
[4]吕西林,张杰.钢和混凝土竖向混合结构阻尼特性研究[J].土木工程学报,2012,45(3):10-16.LXilin,ZHANG Jie.Damping Behavior of VerticalStructures with Upper Steel and Lower ConcreteComponents[J].China Civil Engineering Journal,2012,45(3):10-16.
[5]黄本才.组合结构振动的等效阻尼比[J].上海力学,1998,19(2):141-145.HUANG Bencai.Equivalent Damping Ratios of Vibrationin Composite Structures[J].Shanghai Mechanics,1998,19(2):141-145.
[6]朱镜清.关于复阻尼理论的两个基本问题[J].固体力学学报,1992,13(2):113-118.ZHU Jingqing.On the Two Basic Problems of ComplexDamping Theory[J].Acta Mechanica Solida Sinica,1992,13(2):113-118.
[7]OLLGAARD J G,SLUTTER R G,FISHER J W.ShearStrength of Stud Connectors in Lightweight and Normal-Weight Concrete[J].AISC Engineering Journal,1971(4):55-68.
[8]Eurocode 4:ENV1994-2,Design of Composite Steel andConcrete Structures,Part 2:Bridge[S].
[9]OKADA J,YODA T,LEBET J P.A Study of theGrouped Arrangements of Stud Connectors on ShearStrength Behavior[J].Structural Engineering/EarthquakeEngineering,JSCE,2006,23(1):75-89.
[10]SHIM C S,PARK J S,JEON S M,et al.ExperimentalStudy on Group Stud Shear Connection[C]∥LIEW R,CHOO Y S.Proceedings of 5th International Conference onAdvances in Steel Structures.Singapore:[s.n.],2007:932-937.
[11]侯文崎,叶梅新.铁路桥梁群钉组合结构极限承载力和静力行为分析[J].中国铁道科学,2011,32(1):55-61.HOU Wenqi,YE Meixin.Analysis on the UltimateBearing Capacity and the Statical Behavior of theComposite Structures with Grouped Studs in Railway Bridge[J].China Railway Science,2011,32(1):55-61.
[12]ARIYAWARDENA N D,GHALI A.Design of PrecastPrestressed Concrete Members Using External Prestressing[J].PCI Journal,2002,47(2):84-94.
[13]SIVALEEPUNTH C,NIWA J,BUI K D,et al.Predictionof Tendon Stress and Flexural Strength of ExternallyPrestressed Concrete Beams[J].Journal of JSCE(E),2006,62(1):260-273.
[14]李小珍,刘孝寒,刘德军.考虑桩-土相互作用的连续刚构桥车桥耦合振动分析[J].振动与冲击,2011,30(12):54-58.LI Xiaozhen,LIU Xiaohan,LIU Dejun.Coupled VibrationAnalysis of a Railway Continuous Rigid-frame Bridge andVehicles with Soil-structure Interaction[J].Journal ofVibration and Shock,2011,30(12):54-58.
[15]孙利民,张晨南,潘龙,等.桥梁桩土相互作用的集中质量模型及参数确定[J].同济大学学报,2002,30(4):409-415.SUN Limin,ZHANG Chennan.PAN Long,et al.Lumped-mass Model and Its Parameters for DynamicAnalysis of Bridge Pier-pile-soil System[J].Journal ofTongji University,2002,30(4):409-415.
[16]蒋通,田冶见宏.地基-结构动力相互作用分析方法[M].上海:同济大学出版社,2009:180-188.JIANG Tong,TAJIMI H.Analysis Method of Foundation-structure Dynamic Interaction[M].Shanghai:TongjiUniversity Press,2009:180-188.
[17]李威威,刘伟庆,王曙光,等.基于Simulink的桩-土-结构相互作用反应谱分析[J].世界地震工程,2012,28(1):103-111.LI Weiwei,LIU Weiqing,WANG Shuguang,et al.Response Spectrum Analysis of Pile-soil-structureInteraction Based on Simulink[J].World EarthquakeEngineering,2012,28(1):103-111.
[18]JTG/T B02-01—2008,公路桥梁抗震设计细则[S].JTG/T B02-01—2008,Guidelines for Seismic Design ofHighway Bridges[S].
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