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时间:2019-05-11
《九江长江公路大桥钢混结合段模型试验研究》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2013年第43卷第5期(总第222期)68BridgeConstruction,Vo1.43,No.5,2013(TotallyNo.222)文章编号:1003—4722(2013)05一O068—07九江长江公路大桥钢一混结合段模型试验研究张奇志,吴宝诗。(1.中铁大桥局集团桥科院有限公司,湖北武汉430034;2.桥梁结构安全与健康湖北省重点实验室,湖北武汉430034;3.江西省交通设计院,江西南昌330002)摘要:为研究九江长江公路大桥钢一混结合段的受力特性,制作该桥有格室后承压板式钢一混结合段1
2、:2的大比例尺实体模型进行试验,对最大正弯矩工况下钢一混结合段的钢结构、混凝土箱梁、钢格室、U肋、PBL剪力键及剪力钉的受力及钢一混结合面的相对滑移进行分析。结果表明:钢一混结合段应力从钢梁加劲过渡段、钢一混组合段至混凝土加强过渡段较为匀顺的降低;钢结构实测最大压应力出现在底板U肋处,混凝土实测最大压应力出现在截面积最小的顶板,最大拉应力出现在底板钢格室内部;剪力钉应力从远离承压板位置向承压板处逐渐变小;钢格室腹板受力及钢、混凝土之间的相对滑移非常微小。各部位实测最大应力均未超过规范允许值。关键词:斜拉桥;箱形梁;混
3、合梁;钢一混结合段;模型试验;应力;分析;结构优化中图分类号:U448.38;U446文献标志码:AModelTestStudyofSteelandConcreteJointSection0fJiujiangChangjiangRiverHighwayBridgeZHANGQi-zhi¨,WUBao-shi。(1.BridgeScienceResearchInstituteLtd.,ChinaRailwayMajorBridgeEngineeringGroup,Wuhan430034,China;2.KeyLabor
4、atoryofBridgeStructureSafetyandHealthofHubeiProvince,Wuhan430034,China;3.JiangxiProvincialTransportDesignandResearchInstitute,Nanchang330002,China)Abstract:TostudytheforceconditioncharacteristicsofthesteelandconcretejointsectionofJiu—jiangChangjiangRiverHighway
5、Bridge,thephysicalmodelonalargescaleof1:2forthejointsectionwithsteelcellsandrearbearingplatesofthebridgewasfabricated,testedandtheforceconditionsofthesteelstructure,concreteboxgirder,steelcells,UribsandPBLshearstudsandrelativeslipofthejointsurfacesofthesteeland
6、concreteoftheiointsectionunderthemaximumnormalbendingmomentwereanalyzed.Theresultsofthetestandanalysisshowthatthestressofthesteelandconcreteiointsectionpresentsasmoothdecreasefromthesteelgirderstiffeningsection,jointsectiontotheconcretestiffeningtransitionsecti
7、on.Themeasuredmaximumcompressivestressofthesteelstructureappearsinthebot—tomplateUribs,themeasuredmaximumcompressivestressoftheconcreteappearsinthetopslabwiththesmallestsectiona1areaandthemaximumtensilestressappearsinsidethebottomplatesteelcells.Thestressofthes
8、hearstudsbecomesgraduallydecreasedfromthelocationsfarfromthebearingplatestowardstheplates。theforcesofthewebsofthesteelcellsandtherelativeslipbetweenthesteelandconcretearever
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