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1、橋梁建設(shè)2013年第43卷第l期(總第218期)BridgeConstruction,Vo1.43,No.1,2013(TotallyNo.218)47文章編號:1003—4722(2013)01—0047—05基于鋼管混凝土拱橋檢測結(jié)果的主拱肋病害評估付文勝,田洪松。,孫仲。(1.中鐵大橋局集團(tuán)橋科院有限公司,湖北武漢430034;2.貴州省公路工程集團(tuán)有限公司,貴州貴陽550008;3.武漢市城市路橋收費管理中心,湖北武漢430005)摘要:為探討鋼管混凝土拱橋核心受力部位主拱肋病害(鋼管中混凝土發(fā)生空洞,脫粘等)的評估及加固方法,以某既有鋼管
2、混凝土拱橋(上承式有推力無鉸拱橋,凈跨160m)為背景,通過敲擊法和超聲法相結(jié)合對鋼管拱混凝土密實度進(jìn)行檢測,通過動、靜載試驗對橋梁整體結(jié)構(gòu)受力性能進(jìn)行測試?;趯崪y結(jié)構(gòu)受力行為,利用有限元軟件對主拱肋鋼管混凝土不同狀態(tài)下的應(yīng)力進(jìn)行分析,以此為參照,對主拱肋病害進(jìn)行評估分析。評估結(jié)果表明,主拱肋的主要病害為鋼管混凝土的脫粘而產(chǎn)生的混凝土局部受力截面削弱,主拱肋跨中截面應(yīng)力校驗系數(shù)的異常偏大僅為結(jié)構(gòu)局部病害。基于評估結(jié)果提出以壓漿的方式進(jìn)行拱肋加固,加固后的結(jié)構(gòu)整體受力能滿足設(shè)計荷載要求。關(guān)鍵詞:拱橋;鋼管混凝土結(jié)構(gòu);拱肋;病害;密實度;檢測;荷載試
3、驗;有限元法;評估中圖分類號:U448.22文獻(xiàn)標(biāo)志碼:AAssessmentofDeteri0rati0nsofMainArchRibsofCFSTArchBridgeBasedonInspectionResultsFUWen—sheng,TIANHong—song。SUNZhong。(1.BridgeScienceResearchInstituteLtd.,ChinaRailwayMajorBridgeEngineeringGroup,Wuhan430034.China;2.GuizhouHighwayEngineeringGroupCo.,L
4、td.,Guiyang550008,China;3.UrbanRoadandBridgeTollandManagementCenter,WuhanCity,Wuhan430005,China)Abstract:Tostudythemethodsforassessmentandstrengtheningofthedeteriorations(e.g.theconcretecavityanddebondinginthestee1tubes)ofthemainarchribs,thecritica1lOad—bear—ingpartsoftheconcr
5、ete—filledsteeltube(CFST)archbridge,anexistingCFSTarchbridge(athrustandhingelessdeckarchbridgewithnetspanlength160m)wascitedasexample.Theconcretedensityinthesteeltubesofthearchribsofthebridgewasinspectedbythecombinedmethodofhammeringandultrasonicdetectionandthemechanicalbehavi
6、oroftheglobalstructureofthebridgewastestedbythedynamicandstaticloadtests.Accordingtothemechanicalbehav—iorofthetestedstructure,thefiniteelementsoftwarewasusedtoanalyzethestressofthecon—creteinthesteeltubesindifferentstatusandwithreferencetotheanalysis,thedeteriorationsofthemai
7、narchribswereassessed.Theresultsoftheassessmentshowthatthemajordeteriorationofthearchribsistheweakeningofthelocalconcretesectionscausedbytheconcretedebondinginthesteeltubesandtheabnormallygreatcheckingcoefficientsofthemidspansectionsofthearchribsonlydenotesthelocaldeterioratio
8、nofthestructure.Basedontheassessment,thewavofstrengtheningoft