地震与移动荷载共同作用下连续梁桥的振动问题分析

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1、西南交通大学硕士研究生学位论文第

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3、页AbstractThispapermainlystudiestheresponseofcontinuousbeambridgeundercombinedseismicloadandmovingvehicleload．TheSixianjiaobridgeofGui-GuangRailwayistakenastheexampleforsimulation．Thefiniteelementmodeliscreatedbyusingthefiniteelementsoftwa

4、reANSYS．Inthispaper,thedynamicresponsesofinternalforcesanddisplacementofthebridgeunderthreecombinedloads，italsoprovidesaccurateandvaluabledataonsafetyindicators．Themaincontentsincludethefollowings．1．ThispapertakesthecontinuousbeamofSixianjiaobridgeofGui—Gu

5、angRailwayastheexample．ByusingthefiniteelementsoftwareANSYS，thefiniteelementmodeliscreated，andthedynamicresponsesofthemodelundergoingmovingloadisgoaen．Theinfluencingfactorsincludestrainspeedandtrainload．2．Considingthedifferentseismicloadcombination，thepape

6、rcarriesoutaseriesofnumericalsimulationsbyusingthefiniteelementmodelofthecontinuousbeamofSixianjiaobridgeofGui-GuangRailway．whatismore，theeffectofthepier’Sheightonthedynamicresponsesisalsodiscussed．3．Basedontheformerstudies，derailmentcoefficientandlateralf

7、orceareintroducedassafetyindicatorswhentrainisruning．InordertoCalTyoutacomprehensiveandsystematicstudyofthedynamicresponseofcontinuousbeambridge，eightdifferentworkingconditionsbasedonthedifferenceoftrain’Svelocitiesandseismicloadsaresimulated．Byusingthetra

8、nsientanalysismoduleprovidingbyANSYSsoftware，theeightdifferentworkingconditionsresultsofwhicharestudiedinordertoevaluatethesafetyofthetrainswhichisrunningontherailaresimulated．Keywords：continuousbeambridge；seismicloads；movingloads；dynamicresponse西南交通大学硕士研究

9、生学位论文第lll页目录第1章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯11．1高速铁路概况及桥梁振动问题背景⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯一11．2桥梁动力学研究领域⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．21．3地震与列车荷载共同作用下桥梁振动问题研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．21．4论文主要工作内容⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．3第2章连续梁桥在移动列车荷载作用下的动力响应⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．42．1移

10、动荷载作用下的连续梁动力响应⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．42．2连续梁振型函数的确定⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．62．2．1数值解法求解振型函数⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．62．2．2利用连续梁支座的边界条件求解振型函数⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯一62．3思贤窖大桥在移动列车荷载作用下的响应分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．72．3．1工程概况⋯⋯