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ID:32441972
大小:1.49 MB
页数:7页
时间:2019-02-04
《某预应力混凝土连续梁桥火损评估与加固》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、学兔兔www.xuetutu.com桥梁建设2015年第45卷第4期(总第233期)BridgeConstruction,Vo1.45,No.4,2015(TotallyNo.233)8l文章编号:1003—4722(2015)04—0081—07某预应力混凝土连续梁桥火损评估与加固刘华,高宗余,刘其伟。,张军雷(1.中铁大桥勘测设计院集团有限公司,湖北武汉430050;2.中铁大桥(南京)桥隧诊治有限公司,江苏南京210061;3.东南大学交通学院,江苏南京210018)摘要:某大桥靠岛岸侧的5×35m连续梁引桥于2012年某日凌晨3时左右遭受火
2、灾。为恢复该桥的使用功能,针对火损后的桥跨进行现场检测,并结合火场温度和结构温度场的模拟分析,对结构的受损程度进行综合评定。结果表明箱梁表面有较大面积的混凝土崩落,且造成钢筋外露,受火灾影响最为严重的是内侧翼板处,因火损导致8根横向预应力钢绞线外露。在此基础上针对箱梁混凝土火损后剥落采取砂浆修补或灌注并结合粘贴锚固钢板的措施;针对翼板横向预应力火损采取增设钢结构隔板的措施;针对结构整体采用张拉粘贴预应力碳纤维板的措施进行维修加固。经试验评定,验证了加固方案实施后的桥梁承载能力得以恢复。关键词:连续梁桥;箱形梁;预应力混凝土结构;火损;检测;评估;维
3、修加固中图分类号:U448.215;U445.7文献标志码:AAssessmentandStrengtheningofaFireDamagedPrestressedConcreteContinuousGirderBridgeLIUHua~,GAOZong—yu,LIUQi—wei。,ZHANGJun—lei'。(1.ChinaRailwayMajorBridgeReconnaissance&DesignGroupCo.,Ltd.,Wuhan430050,China;2.ChinaRailwayMajorBridge(Nanjing)Bridge8L
4、TunnelDiagnosis&RemedialCo.,Ltd.,Nan—jing210061,China;3.SchoolofTransp0rtati0n,SoutheastUniversity,Nanjing210018,China)Abstract:The5×35一mspancontinuousgirderapproachbridgeofabridgeontheislandbanksidecaughtfireatabout03:00intheearlymorninginadayin2012.Torestoretheoperationalfun
5、ctionofthebridge,thefiredamagedspansofthebridgewereinspectedinthefield,thefiretemperaturesandtemperaturefieldsofthestructureweresimulatedandanalyzedandthedamagedegreesofthestructurewerecomprehensivelyassessed.Theresultsoftheassessmentshowthatrathergreatareaofconcretespallingoc
6、cursonthesurfaceoftheboxgirderofthebridgeandtheconcretespallingcausestheexposureofthereinforcementthere.Thepartoftheboxgirderaffect—edmostseverelybythefiredamageistheinnersidecantileverslabwhere8transverseprestressingsteelwirestrandsareexposed.Accordingtotheassessment,theconcr
7、etespallingoftheboxgird—erisrepairedbythemeasureofplasteringorgroutingthecementmortarandbindingtheanchorsteelplates.Thedamagedprestressingsteelwirestrandsofthecantileverslabarerepairedbythemeasureofaddingthesteelpartitionplatesandthewholestructureisrepairedandstrengthenedbythe
8、measureofbindingandtensioningtheprestressingcarbonfiberreinfo
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