公路钢拱塔斜拉桥车致振动试验与数值分析

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1、公路钢拱塔斜拉桥车致振动试验与数值分析李鑫，梁力，王福春，陈开利37文章编号：1003-4722(2011)04—0037—04公路钢拱塔斜拉桥车致振动试验与数值分析李鑫，梁力，王福春，陈开利。(1．东北大学土木工程研究所，辽宁沈阳110004；2．沈阳市市政工程设计研究院，辽宁沈阳110015；3．中铁大桥局桥科院有限公司，湖北武汉430O34)摘要：为了研究沈阳市三好桥(公路钢拱塔斜拉桥)在汽车荷载作用下的动态响应，通过测试得到不同速度的车辆通过时桥梁的竖向振幅和冲击系数，通过数值分析得到不同阻尼桥梁相应的动态响应和动力放大系数。分析

2、结果表明：桥面平整的桥梁可采用数值方法计算桥梁的动态响应及其动力放大系数；主梁的位移和弯矩的冲击系数与车速呈波动变化，塔根弯矩的冲击系数、斜拉索和水平索最大索力和应力幅的冲击系数随着车速的增大而增大；不考虑阻尼时，桥梁各响应量的冲击系数的值偏大；考虑阻尼比时，各响应量的冲击系数随着桥梁阻尼比的增大而减小；阻尼比较小的桥梁，阻尼比对其动力响应影响较小。关键词：斜拉桥；车致振动；跑车试验；冲击系数；有限元法中图分类号：U448．27；U446．1文献标志码：ATestingandNumericalAnalysisofVehicle-Induc

3、edVibrationofaHighwayCable-StayedBridgewithSteelArchPylonsLIXin，LIANGLi，WANGFu—chun，CHENKai—li。(1．InstituteofCivilEngineering，NortheasternUniversity，Shenyang110004，China；2．ShenyangMunicipalEngineeringDesignandResearchInstitute，Shenyang110015，China；3．BridgeScienceResearchI

4、nstituteLtd．，ChinaRailwayMajorBridgeEngineeringGroup，Wuhan430034，China)Abstract：TostudythedynamicresponseoftheSanhaoBridge(ahighwaycable—stayedbridgewithsteelarchpylons)inShenyangCityundertheactionofvehicleload，thetestingwasmadeandtheverticalvibrationamplitudeandimpactfac

5、torsofthebridgewhenvehiclespassedatdifferentspeedwereobtained．Thenumericalanalysiswasmadefurtherandthecorrespondingdynamicresponseanddynamicamplificationfactorsofthebridgewithdifferentdampingwereob—tainedaswel1．Theresultsofthetestingandanalysisrevealthatforthebridgewithev

6、endeck，thenumericalmethodcanbeusedtocalculatethedynamicresponseanddynamicamplificationfactors．Thedisplacementandtheimpactfactorsofbendingmomentofthemaingirderfluctuatewiththevehiclespeed，theimpactfactorsofbendingmomentofpylonfootings，themaximumca—bleforcesofstaycablesandh

7、orizontalcablesandtheimpactfactorsofstressamplitudeincreasewiththeincreaseofthevehiclespeed．Whenthedampingisnottakenintoaccount，thevaluesoftheimpactfactorsofvariousresponsevariablesofthebridgeareslightlygreat，however，whenthedampingistakenintoaccount，theimpactfactorsofther

8、esponsevariableswilldecreasewiththeincreaseofthedampingofthebridge．Forthebridgewithlowdampingrat