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页数:6页
时间:2019-05-11
《沪通长江大桥大位移梁端伸缩装置动力性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2015年第45卷第6期(总第235期)BridgeConstruction,Vo1.45,No.6,2015(TotallyNo.235)文章编号:1003—4722(2015)05—0041—06沪通长江大桥大位移梁端伸缩装置动力性能研究高芒芒,臧晓秋,熊建珍(中国铁道科学研究院,北京100081)摘要:沪通长江大桥主航道桥为主跨1092m的公铁两用连续钢桁梁斜拉桥,主航道桥两侧为跨度112m的钢桁简支梁桥,主航道桥、钢桁梁桥间设置伸缩量为±900mm的梁端伸缩装置。为考察该桥伸缩缝对列车和桥梁动力响应的
2、影响,针对其梁端伸缩装置初步设计的比选方来进行车线桥动力性能研究。按照实际情况建立包括主航道桥、钢桁梁桥和梁端伸缩装置的完整桥梁结构模型,采用逐步积分法分析车桥耦合振动。结果表明,梁端伸缩装置与两侧主航道桥、钢桁梁桥上的轨道结构变形存在差异,此梁端附近区域的局部不平顺造成了对车辆和伸缩装置的冲击,使得部分工况下车辆响应超限,支承梁的加速度与铜陵长江大桥的梁端伸缩装置设计方案相比偏高,尤其在主梁收缩状态下,上述情况更为明显。关键词:公路铁路两用桥;斜拉桥;钢桁梁;梁端伸缩装置;车线桥耦合;振动分析;动力性能中图分类号:
3、U448.27;U443.31文献标志码:AStudyofDynamicPerformanceofLargeMovementGirderEndExpansionDevicesofHutongChangjiangRiverBridgeGAOMang-mang,ZANGXiao—qiu,XIONGJian—zhen(ChinaAcademyofRailwaySciences,Beijing100081,China)Abstract:ThemainshipchannelbridgeoftheHutongChangJiang
4、RiverBridgeisarail—cum—roadcontinuoussteeltrussgirdercable—stayedbridgewithamainspanof1092m.Onbothsidesofthemainshipchannelbridgearethe112一mspansimply—supportedsteeltrussgirderbridgesandbetweenthemainshipchannelbridgeandthesteeltrussgirderbridges,thegirderendex
5、pansiondevicesof±900mmmovementamountarearranged.Toinvestigatetheinfluencesoftheexpan—siondevicesofthebridgeonthedynamicresponsesofthetrainandbridge,thetrain—track—bridgedynamicperformancewasstudiedbasedonthecomparativeschemesinthepreliminarydesignoftheexpansion
6、devices.Thecompletestructuralmodel,includingthemainshipchannelbridge,steeltrussgirderbridgeandgirderendexpansiondevice,wasestablishedaccordingtotheactualconditionsandthetrain—bridgecouplingvibrationwasanalyzed,usingthestep—by—stepintegrationmethod.Theresultsoft
7、hestudydemonstratethatthedeformationofthegirderendexpansionde—vicesandthetrackstructuresonthemainshipchannelbridgeandthesteeltrussgirderbridgesonbothsideshasdifferencesandthelocalirregularityintheareasnearbythegirderendscausesim—pacttothetrainandexpansiondevice
8、s,whichwillcauseexcessiveresponsesofthetrainundersomeloadcases.Theaccelerationofthesupportinggirdersofthebridgeissomehighascomparedtotherelevantdesigninthegirderendexpansion
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