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时间:2020-04-02
《大轴重重载铁路简支梁桥梁轨相互作用研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2014年第44卷第5期(总第228期)BridgeConstruction,Vol.44,No.5,2014(TotallyNo.228)27文章编号:1003-4722(2014)05-0027-06大轴重重载铁路简支梁桥梁轨相互作用研究戴公连,朱俊樸,闫斌(中南大学土木工程学院,湖南长沙410075)摘要:为探明大轴重重载铁路简支梁桥上无缝线路钢轨纵向应力和墩顶水平力的分布规律,以我国在建的30t轴重重载铁路双线32m简支T梁为例进行梁轨相互作用分析。采用AN-SYS建立多跨重载简支梁桥-无缝线路一体化分析模型(
2、桥梁与轨道的非线性连接采用非线性杆单元模拟),研究温度和活载作用下钢轨纵向应力与墩顶水平力的分布特点,分析简支梁跨数对纵向力分布的影响。在此基础上,探讨检算钢轨应力时,挠曲力与制动力组合方式的合理性。分析表明:重载铁路简支梁桥上无缝线路钢轨所受纵向应力普遍比客货共线铁路大9.8%~31%;简支梁跨数增加至8跨时,钢轨和墩顶的受力逐渐趋近于稳定;在检算墩顶水平力时,采用挠曲力、制动力耦合的方式进行计算较为安全。关键词:铁路桥;简支梁桥;重载铁路;梁轨共同作用;纵向力分布;有限元法中图分类号:U448.13文献标志码:AStudy
3、ofBeamandTrackInteractionforSimply-SupportedBeamBridgeofHeavyAxleLoadHeavyHaulRailwayDAIGong-lian,ZHUJun-pu,YANBin(SchoolofCivilEngineering,CentralSouthUniversity,Changsha410075,China)Abstract:Toascertainthedistributionlawsofthelongitudinalstressofthecontinuouslywel
4、dedrailsandthepiertophorizontalforcesofthesimply-supportedbeambridgeofheavyaxleloadheavyhaulrailway,adouble-track32msimply-supportedT-beambridgeof30taxleloadheavyhaulrailwaycurrentlybeingbuiltinChinawastakenasanexampleandthebeamandtrackinteractionforthebridgewasstud
5、ied.BymeansofthesoftwareANSYS,theintegratedanalysismodel(thenonlinearlinkofthebeamandtrackswassimulatedbythenonlinearlinkelement)forthemulti-spansimply-supportedbeambridgeandthecontinuouslyweldedrailswasestablished,thedistributioncharacteristicsofthelongitudinalstre
6、ssoftherailsandthepiertophorizontalforcesundertheactionoftemperatureandliveloadswerestudiedandtheinfluencesofthespannumbersofthebridgeonthedistributionofthelongitudinalforceswereanalyzed.Onthebasisofthestudyandanalysis,therationalityoftheflexuralforceandbrakingforce
7、combinationwaysforthecheckingcalculationofthestressoftherailswasdiscussed.Theresultsofthestudyre-vealthatthelongitudinalstressofthecontinuouslyweldedrailsonthesimply-supportedbeambridgeofheavyaxleloadheavyhaulrailwayisgenerally9.8%~31%greaterthanthatofthecommonpasse
8、ngerandfreightrailway.Whenthespannumbersofthebridgeincreaseby8spans,theforcesoftherailsandthepiertopgraduallytendtobestableandwhenthepiert
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