某斜拉桥钢箱梁横隔板裂缝分析与加固方法研究-论文.pdf

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1、桥梁建设2014年第44卷第4期(总第227期)BridgeConstruction，Vo1．44，No．4，2014(TotallyNo．227)107文章编号：1003—4722(2014)04—0107—05某斜拉桥钢箱梁横隔板裂缝分析与加固方法研究宋广君，华龙海(天津市市政工程设计研究院，天津300051)摘要：某斜拉桥为主跨310m的重载钢一混凝土混合梁独塔斜拉桥。经过多年运行，该桥钢箱梁横隔板出现了大量裂缝，为提高桥梁的安全性，对其钢箱梁横隔板裂缝成因进行研究。采用MIDAS软件建立钢箱梁节段有限元模型，对55t重车后

2、轴分别在中间车道和边车道加载时横隔板的应力进行分析，分析结果表明：钢箱梁横隔板产生裂缝的主要原因在于其上的预留人孔过大致使U肋开孔处的应力幅过高，超出结构的疲劳强度，造成了疲劳开裂。据此提出了在人孔处设置桁架结构的加固方法来改善结构受力和抗疲劳性能，并对桁架的布置方案和横断面形式进行了优化比选，得到了较优的加固方案。实践证明加固方案实施效果良好。关键词：斜拉桥；钢箱梁；横隔板；裂缝；疲劳破坏；成因分析；桥梁加固中图分类号：U445．71文献标志码：AAnalysisandStrengtheningMethodResearchfor

3、CracksinDiaphragmsofSteelBoxGirderofaCable’IStayedBridgeSONGGuang-jlln，HUALong—hai(TianjinMunicipalEngineeringDesign&ResearchInstitute．Tianjin300051，China)Abstract：Acable—stayedbridgepresentedinthispaperisaheavyvehicleloadsteelandcon—cretehybridgirdercable—stayedbridg

4、ewithasinglepylonandamainspanof310m．AfteryearsofoDeration，agreatamountofthecrackshaveappearedinthediaphragmsofthesteelboxgirderofthebridge．Toimprovethesafetyofthebridge，theformationcausesofthecrackswerestud—ied．ThesoftwareMIDASwasusedtoestablishthesectionalfiniteeleme

5、ntmodelfortheboxgirderandthestressinthediaphragmswhentheloadofrearaxleofthe55theavyvehiclewasre—spective1yappliedtothemiddleandsidelaneswasanalyzed．TheresultsoftheanalysisshowthattheDrimarycauseleadingtothecracksinthediaphragmsisthatthedesignedsizesoftheman—ho1esinthe

6、steelboxgirderareabittoobig．Thebigsizesofthemanholescausethestressam—DlitudeintheUribopeningstobehighandexceedthestructuralfatiguestrengthandhencecausethefatiguecracking．Accordingtotheanalysis，thestrengtheningmethodofaddingtrussstruc—turesatthemanholesisproposedtoimpr

7、ovethestructuralforceconditionsandfatigueperform—ance．ThearrangementschemesandthecrosssectiontypesO{thetrussstructuresarealsoopti—ma11vcomparedandabetterschemeforstrengtheningthemanholesisconsequentlyobtained．Practiceprovesthattheobtainedschemehasworkedwel1．Keywords：c

8、able—stayedbridge；steelboxgirder；diaphragm；crack；fatiguedamage；forma—tioncauseanalysis；bridgestrengthening1原桥简介一混凝土混合梁独塔斜拉桥，