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1、橋梁建設(shè)2013年第43卷第2期(總第219期)BridgeConstruction，Vo1．43，No．2，2013(TotallyNo．219)93文章編號：1003—4722(2013)02—0093—06丫髻沙大橋橋面系加固設(shè)計(jì)陳紅(廣州交通投資集團(tuán)有限公司，廣東廣州510288)摘要：針對丫髻沙大橋(主橋?yàn)橹骺?60m的三跨連續(xù)中承式鋼管混凝土拱橋)運(yùn)營期間橋面系出現(xiàn)的病害(部分縱梁、橫梁連接處高強(qiáng)螺栓松動(dòng)、斷裂，連接角鋼開裂、斷裂，部分橫梁腹板與下翼緣連接處焊縫開裂等)，進(jìn)行原因分析及橋面系加固設(shè)計(jì)。經(jīng)分析，汽車荷載增加引起橋面系橫梁的應(yīng)力增加，降低鋼結(jié)構(gòu)的疲勞性能是引起
2、橋面系病害的主要原因。加固設(shè)計(jì)活載維持原設(shè)計(jì)荷載標(biāo)準(zhǔn)不變，通過增設(shè)止裂孔，增加鋼橫粱截面，增設(shè)大縱梁，改變縱粱、橫梁的連接方式對橋面系進(jìn)行系統(tǒng)加固，采用有限元計(jì)算及試驗(yàn)檢驗(yàn)了加固措施的安全性及有效性。關(guān)鍵詞：拱橋；中承式；鋼管混凝土結(jié)構(gòu)；橋面系；鋼梁；加固；設(shè)計(jì)中圖分類號：U448．22；U445．72文獻(xiàn)標(biāo)志碼：AStrengtheningDesignofFloorSystemofYajishaBridgeCHENHong(GuangzhouTransportInvestmentGroupCo．，Ltd．，Guangzhou510288，China)Abstract：Intheli
3、ghtofthedeteriorations(thelooseningandbreakingofthehigh—strengthboltsatconnectionsofpartofthestringersandcrossbeams，thecrackingandbreakingofpartoftheconnectinganglesteelsandthecrackingintheweldingseamsatconnectionsofpartofthecrossbeamwebsandlowerflanges)havingoccurredinthefloorsystemoftheYajish
4、aBridge(themainbridgeisathree-spanhalf-throughcontinuousconcrete-filledsteeltubearchbridgewithamainspan360m)intheoperationperiod，thecausesleadingtothedeteriorationswerean—alyzedandthestrengtheningofthefloorsystemofthebridgewasdesigned．Accordingtothea—nalysis，itwasconcludedthatthemaincauseleadin
5、gtothedeteriorationswastheincreaseofstressintheCROSSbeamsofthefloorsystemandthedecreaseoffatigueperformanceofthesteelstructurecausedbytheincreaseoftruckload．Inthedesign，theliveloadcriterionforthestrengtheningofthefloorsystemremainedunchangedandthefloorsystemwastobesystemati—callystrengthenedbya
6、ddingthecrackstoppingholes，increasingthesectionsofthecrossbeamsandlongitudinalgirdersandchangingtheconnectingwaysofthestringersandcrossbeams．Fi—nally，thesafetyandeffectivenessofthestrengtheningmeasureswereverifiedbythefiniteele-mentcalculationandtests．Keywords：archbridge；half—through；concrete—f
7、illedsteeltubestructure；floorsystem；steelgirder；strengthening；design1概述管混凝土拱橋(圖1)。主拱及橋面系鋼結(jié)構(gòu)采丫髻沙特大橋是廣州市環(huán)城高速公路西南環(huán)跨用16Mnq鋼，拱肋填充C6o微膨脹混凝土，橋面系越珠江南航道的一座特大橋，于2000年6月建成通為橫梁體系引，橫梁最大長度為38m[3，橫梁上鋪車，主橋?yàn)?6m+36Om+76m三跨連續(xù)中承式鋼設(shè)跨度8m的鋼筋混凝土板，橋面由厚8cm
