中小跨径混凝土连续梁桥地震易损性研究
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摘要
以国内常见的中小跨径混凝土连续梁桥为对象,考虑了桥墩、板式橡胶支座构件损伤,对桥梁系统进行了地震易损性分析。在桥梁易损性分析中,使用了超拉丁方抽样技术形成桥梁样本,从太平洋地震工程研究中心数据库中选取了大量地震波作为地震动输入样本,以桥墩漂移率、支座相对变形作为损伤指标,并对损伤指标予以了量化。在计算得到桥梁构件易损性曲线的基础上,使用一阶可靠度理论形成了桥梁系统易损性曲线的上下界限,并得出了桥梁不同损伤状态对应的具有统计意义的中位值地震动强度。研究结果对于在役的同类型桥梁抗震加固设计及地震灾害损失评估提供了理论依据。
Selecting the common medium and small sized concrete continuous girder bridges in China as research objects,the fragility of the bridge system is analyzed.In the fragility analysis,Hyper-Latin cube is used for the sampling of the bridges,the earthquake motion records are selected from the database of Pacific Earthquake Research Centre as input samples of earthquake motion,the pier drift ratio and bearing relative displacement are defined as damage indexes and quantified.Based on the calculated bridge component fragility curves,first-order reliability theory is implemented to give the upper and lower bounds of the fragility curves of bridge system and to obtain the statistical median of ground motion intensity for different bridge damage statuses.The research result provides a theoretic foundation for the similar as-built bridges for seismic rehabilitation design and earthquake loss risk evaluation.
Selecting the common medium and small sized concrete continuous girder bridges in China as research objects,the fragility of the bridge system is analyzed.In the fragility analysis,Hyper-Latin cube is used for the sampling of the bridges,the earthquake motion records are selected from the database of Pacific Earthquake Research Centre as input samples of earthquake motion,the pier drift ratio and bearing relative displacement are defined as damage indexes and quantified.Based on the calculated bridge component fragility curves,first-order reliability theory is implemented to give the upper and lower bounds of the fragility curves of bridge system and to obtain the statistical median of ground motion intensity for different bridge damage statuses.The research result provides a theoretic foundation for the similar as-built bridges for seismic rehabilitation design and earthquake loss risk evaluation.
引文
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[18]IAN B,IAN F,JOHN M,et al.Seismic RetrofittingManual for Highway Structures,Part 1[R].Virginia:USDepartment of Transportation,2006.
[2]HWANG H,刘晶波.地震作用下钢筋混凝土桥梁结构易损性分析[J].土木工程学报,2004,37(6):47-51.HWANG H,LIU Jing-bo.Seismic Fragility Analysis ofReinforced Concrete Bridges[J].China Civil EngineeringJournal,2004,37(6):47-51.
[3]NIELSON B G,DESROCHES R.Seismic FragilityMethodology for Highway Bridges Using a Component LevelApproach[J].Earthquake Engineering and StructuralDynamics,2007,36(6):823-839.
[4]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 andRecent Research on Seismic Design of Highway Bridges[J].Journal of Highway and Transportation Research andDevelopment,2011,28(10):44-53.
[5]李春风.汶川地震桥梁震害与延性抗震设计探讨[J].公路交通科技,2009,26(4):98-102.LI Chun-feng.Discussion on Bridge Damage in WenchuanEarthquake and Seismic Ductility Design[J].Journal ofHighway and Transportation Research and Development,2009,26(4):98-102.
[6]PAN Y,AGRAWAL A K,GHOSN M.Seismic Fragilityof Continuous Steel Highway Bridges in New York State[J].Journal of Bridge Engineering,2007,12(6):689-699.
[7]庄军生.桥梁支座[M].3版.北京:铁道出版社,2010.ZHUANG Jun-sheng.Bridge Bearing[M].3rd ed.Beijing:China Railway Publishing House,2010.
[8]李杨海,鲍卫刚,郭修武,等.公路桥梁结构可靠度与概率极限状态设计[M].北京:人民交通出版社,1997.LI Yang-hai,BAO Wei-gang,GUO Xiu-wu,et al.Highway Bridge Structural Reliability and Stochastic LimitStatus Design[M].Beijing:China CommunicationsPress,1997.
[9]PADGETT J E,DESROCHES R.Methodology for theDevelopment of Analytical Fragility Curves for RetrofittedBridges[J].Earthquake Engineering and StructuralDynamics,2008,37(8):1157-1174.
[10]COMARTIN C D.Seismic Evaluation and Retrofit ofConcrete Buildings[R].Redwood City:AppliedTechnology Council,1996.
[11]PARK Y J,ANG A H S.Mechanistic Seismic DamageModel for Reinforced Concrete[J].Journal of StructuralEngineering,1985,111(4):722-739.
[12]FARIA R,OLIVER J,CERVERA M.A Strain-BasedPlastic Viscous-Damage Model for Massive ConcreteStructures[J].International Journal of Solids andStructures,1998,35(14):1533-1558.
[13]孙颖,卓卫东,房贞政.规则桥梁抗震性能水准的定义及其量化描述[J].地震工程与工程振动,2011,31(5):104-112.SUN Ying,ZHUO Wei-dong,FANG Zhen-zheng.Definition and Quantified Description of SeismicPerformance Levels for Regular Bridges[J].Journal ofEarthquake Engineering and Engineering Vibration,2011,31(5):104-112.
[14]陆本燕,刘伯权,刘鸣,等.钢筋混凝土桥墩性能指标量化研究[J].中国公路学报,2010,23(6):49-57.LU Ben-yan,LIU Bo-quan,LIU Ming,et al.QuantitativeResearch on Reinforced Concrete Performance Index ofReinforced Concrete Bridge Column[J].China Journal ofHighway and Transport,2010,23(6):49-57.
[15]JTG/TB02-01—2008,公路桥梁抗震设计细则[S].JTG/TB02-01—2008,Guidelines for Seismic Design ofHighway Bridges[S].
[16]李立峰,吴文朋,黄佳梅,等.板式橡胶支座地震易损性分析[J].湖南大学学报,2011,38(11):1-6.LI Li-feng,WU Wen-peng,HUANG Jia-mei,et al.Research on the Seismic Vulnerability Analysis ofLaminated Rubber Bearing[J].Journal of HunanUniversity,2011,38(11):1-6.
[17]CORNELL C A,JALAYER F,HAMBURGER R O.Probabilistic Basis for 2000 SAC Federal EmergencyManagement Agency Steel Moment Frame Guidelines[J].Journal of Structural Engineering,2002,128(4):526-532.
[18]IAN B,IAN F,JOHN M,et al.Seismic RetrofittingManual for Highway Structures,Part 1[R].Virginia:USDepartment of Transportation,2006.
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