铁路简支梁桥基础刚度的静动力影响研究

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1、铁路简支梁桥基础刚度的静动力影响研究何庭国，安伟胜，李永乐，曾焰27文章编号：1003—4722(2010)04—0027—05铁路简支梁桥基础刚度的静动力影响研究何庭国。，安伟胜，李永乐，曾焰(1．西南交通大学土木工程学院，四川成都610031；2．中铁二院工程集团有限公司，四川成都610031)摘要：为考察基础布置形式对桥梁静、动力性能的影响，设计一座55跨不同墩高的双线简支梁桥，采用有限元法分析对比2种基础自身刚度差异和基础一墩组合刚度差异，及桥梁结构动力特性和车一桥耦合振动特性。研究结果表明，考虑基础刚度后所得基础一墩身组合刚

2、度较墩身刚度下降明显，横桥向刚度下降尤其显著；基础刚度对桥梁结构的自振特性影响有限；车辆通过桥梁时，车辆动力响应对桩基础布置形式的差异不敏感；基础刚度对桥墩顺桥向振动幅值影响较小，对桥墩横桥向振动幅值影响较为明显。在高速铁路上，应当考虑基础刚度对桥梁横向振动的影响。关键词：铁路桥；简支梁；桩基础；静力分析；动力特性；基础刚度中图分类号：U448．13；U443．15文献标志码：AStudyofStaticandDynamicInfluencesofFoundationStiffnessofRailwaySimply-Supported

3、BearnBridge一一一一一HETing—guo，ANWei—sheng，LIYong—le，ZENGYan(1．SchoolofCivilEngineering，SouthwestJiaotongUniversity，Chengdu610031，China2．ChinaRailwayTieeryuanEngineeringGroupCo．，Ltd．，Chengdu610031，China)Abstract：Toinvestigatetheinfluenceofdifferentfoundationlayoutonthestati

4、canddynam—icbehaviorofbridge，a55一spandouble—trackrailwaysimply—supportedbeambridgewithdifferentpierheightisdesignedandthefiniteelementmethodisusedtOanalyzeandcomparethediffer—eneesofthefoundationSownstiffnessandthefoundation—piercombinationstiffnessoftwotypesoffoundatio

5、ns，thestructuraldynamiccharacteristicofthebridgeandthevehicle—bridgecouplingvibrationcharacteristic．Theresultsoftheanalysisandcomparisonindicatethatafterthefounda—tionstiffnessiSconsidered，theobtainedfoundation—piercombinationstiffnessdecreasessignifi—cantlyincomparison

6、tothepiershaftstiffnessandthedecreaseofthestiffnesstransversetOthebridgeisparticularlysignificant．Theinfluenceofthefoundationstiffnessonthenaturalvibrationcharacteristicofthebridgestructureislimited．Whenvehiclespassthroughthebridge，thedy—namicresponseofthevehiclesisnots

7、ensitivetothedifferencesofthepilefoundationlayout．TheinfluenceofthefoundationstiffnessonthevibrationamplitudevaluesofthepiersalongthebridgeiSlittle。however。theinfluenceonthevibrationamplitudevaluesofthepierstransversetOthebridgeissignificant．Forthebridgesonhigh—speedrai

8、lway，theinfluenceofthefoundationstiff—nessonthevibrationtransversetOthebridgeshouldbewellconsidered．Keywords：r