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ID:36466556
大小:1.35 MB
页数:7页
时间:2019-05-10
《乌苏大桥大挑臂钢箱组合梁扭转性能试验研究》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2014年第44卷第5期(总第228期)56BridgeConstruction,Vo1.44,No.5,2014(TotallyNo.228)文章编号:1003—4722(2014)05—0056—07乌苏大桥大挑臂钢箱组合梁扭转性能试验研究强士中,邢兵,李小珍,雷虎军,肖海珠。(1.西南交通大学土木工程学院,四川成都610031;2.中铁大桥勘察设计院集团有限公司,湖北武汉430056)摘要:为研究大挑臂钢箱结合梁截面的抗扭刚度,以黑瞎子岛鸟苏大桥——(140+140)m的钢箱组合粱
2、独塔单索面斜拉桥为对象,通过1:4的缩尺节段模型试验和有限元计算,对单车道、双车道和3车道偏载工况下结构的扭转性能进行分析。结果表明:3车道偏载作用下,主梁的实测最大扭转角和最大剪应力为9.88×10rad和14.71MPa,远小于桥面横坡2和规范允许的125MPa,乌苏大桥钢箱组合梁截面具有足够的抗扭刚度,且富余量大;增加钢箱梁底板和腹板厚度可显著提高钢箱组合截面的抗扭刚度,而增加钢箱梁顶板厚度对截面抗扭刚度的提高有限。关键词:斜拉桥;结合梁;扭转刚度;节段模型;模型试验;有限元分析;扭转角中
3、图分类号:U448.27;U448.216文献标志码:AExperimentalStudyofTorsionalBehaviorofLongCantileverSteelBoxCompositeGirderofWusuBridgeQIANGShi-zhong,XINGBing,LIXiao—zhen,LEJHu-jun。XIAOHai—zhu(1.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China;2.
4、ChinaRailwayMajorBridgeReconnaissance&DesignGroupCo.,Ltd.Wuhan430056,China)Abstract:Tostudythesectionaltorsionalstiffnessofthelongcantileversteelboxcompositegirder,theWusuBridge,asteelboxcompositegirdercable—stayedbridgewithasinglepylon,singlecablepl
5、aneandwithspanarrangement(14O+140m),inHeixiaziIslandwastakenastheresearchobjectandbymeansofthe1:4scaled—downsectionalmodeltestandfiniteelementcal—culation,thetosionalbehaviorofthegirderstructureundertheeccentricloadingcasesofasinglelane,thedoublelane
6、sand3laneswasanalyzed.Theresultsoftheanalysisindicatethatundertheeccentricloadingcaseofthe3lanes,themeasuredmaximumtorsionalangleandmaximumshearstressofthemaingirderarerespectively9.88×10一radand14.71MPa,whicharefarlessthanthe2%transverseslopeofthedec
7、kandthe125MPaasallowedinthecodes.ThesectionofthecompositegirderoftheWusuBridgehassufficienttorsionalstiffnessandthemarginofthestiffnessiSgreat.Theincreaseofthethicknessofthebottomplateandwebsofthesteelboxgirdercansignificantlyincreasethesectionaltors
8、ionalstiffnessofthecompositegirder,however,fortheincreaseofthetorsiona1stiffness,theincreaseofthethicknessofthetopplateofthegird—erislimited.Keywords:cable-stayedbridge;compositegirder;torsionalstiffness;sectionalmodel;roodeltest;finiteelementanalysi
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