地震与移动荷载共同作用下连续梁桥的振动问题研究.docx

地震与移动荷载共同作用下连续梁桥的振动问题研究
摘要：
随着城市化的不断发展，城市桥梁的数量和规模不断增大。在桥梁使用过程中，地震和移动荷载可能会对连续梁桥产生振动。因此，本研究通过数学建模和数值仿真的方法，分析了地震和移动荷载共同作用下连续梁桥的振动问题。研究结果表明：地震和移动荷载共同作用下，连续梁桥的振动会受到较大的影响。为了提高桥梁的抗震能力和荷载承载能力，需要采取有效的措施来改善桥梁的结构设计和施工工艺。
关键词：地震；移动荷载；连续梁桥；振动问题；数值仿真
Abstract：
Withthecontinuousdevelopmentofurbanization,thenumberandscaleofurbanbridgesareincreasing.Intheprocessofbridgeuse,earthquakesandmovingloadsmaycausevibrationsinthecontinuousbeambridge.Therefore,thisstudyanalyzesthevibrationproblemofcontinuousbeambridgesunderthecombinedactionofearthquakesandmovingloadsthroughmathematicalmodelingandnumericalsimulations.Theresultsshowthatunderthecombinedactionofearthquakesandmovingloads,thevibrationofcontinuousbeambridgesisgreatlyaffected.Inordertoimprovetheseismicresistanceandloadcarryingcapacityofbridges,effectivemeasuresneedtobetakentoimprovethestructuraldesignandconstructiontechnologyofbridges.
Keywords:Earthquake;Movingload;Continuousbeambridge;Vibrationproblem;Numericalsimulation
1.Introduction
Urbanbridgesareimportanttransportationinfrastructures,whichplayavitalroleinthedevelopmentofurbaneconomyandsociety.Withthecontinuousdevelopmentofurbanization,thenumberandscaleofurbanbridgesareincreasing.Intheprocessofbridgeuse,earthquakesandmovingloadsmaycausevibrationsinthecontinuousbeambridge.Therefore,itisnecessarytostudythevibrationproblemofcontinuousbeambridgesunderthecombinedactionofearthquakesandmovingloads.
2.LiteratureReview
Atpresent,theresearchonthevibrationproblemofcontinuousbeambridgesmainlyfocusesonthefollowingaspects:
1)Theoreticalresearchonthedynamicresponseofcontinuumstructuresunderearthquakeexcitation.Mutohetal.[1]establishedavibrationequationofmulti-spancontinuousbeambridgesunderverticalgroundmotionandobtainedthenaturalfrequenciesandmodesofthebridge.Martinetal.[2]studiedthedynamicbehaviorofacontinuoussteeltrussbridgesubjectedtoaseismicexcitation.
2)Numericalanalysisofthedynamicresponseofcontinuumstructuresunderearthquakeexcitation.Chenetal.[3]usedfiniteelementmethodtoanalyzetheseism