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页数:6页
时间:2019-05-11
《丫髻沙大桥桥面系加固设计》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2期(总第219期)BridgeConstruction,Vo1.43,No.2,2013(TotallyNo.219)93文章编号:1003—4722(2013)02—0093—06丫髻沙大桥桥面系加固设计陈红(广州交通投资集团有限公司,广东广州510288)摘要:针对丫髻沙大桥(主桥为主跨360m的三跨连续中承式钢管混凝土拱桥)运营期间桥面系出现的病害(部分纵梁、横梁连接处高强螺栓松动、断裂,连接角钢开裂、断裂,部分横梁腹板与下翼缘连接处焊缝开裂等),进行原因分析及桥面系加固设计。经分析,汽车荷载增加引起桥面系横梁的应力增加,降低钢结构的疲劳性能是引起
2、桥面系病害的主要原因。加固设计活载维持原设计荷载标准不变,通过增设止裂孔,增加钢横粱截面,增设大纵梁,改变纵粱、横梁的连接方式对桥面系进行系统加固,采用有限元计算及试验检验了加固措施的安全性及有效性。关键词:拱桥;中承式;钢管混凝土结构;桥面系;钢梁;加固;设计中图分类号:U448.22;U445.72文献标志码: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概述管混凝土拱桥(图1)。主拱及桥面系钢结构采丫髻沙特大桥是广州市环城高速公路西南环跨用16Mnq钢,拱肋填充C6o微膨胀混凝土,桥面系越珠江南航道的一座特大桥,于2000年6月建成通为横梁体系引,横梁最大长度为38m[3,横梁上铺车,主桥为76m+36Om+76m三跨连续中承式钢设跨度8m的钢筋混凝土板,桥面由厚8cm
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