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《多点支撑加固坦拱桥试验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第26卷第11期公路交通科技Vo1.26No.1l2009年11月JournalofHighwayandTransportationResearchandDevelopmentNOV.20o9文章编号:1002—0268(2009)11—0066-05多点支撑加固坦拱桥试验研究周建庭,张劲泉,任红伟,刘庆阳。,王玲(1.重庆交通大学,重庆400074;2.交通部公路科学研究院,北京100088;3.重庆高发司中渝营运分公司,重庆400067;4.黄河勘测规划设计有限公司,河南郑州450003)摘要:以多点支撑加固坦
2、拱桥技术原理为依据,在完成2片模型试验拱的制作、加固前后测试的基础上,对比分析了圬工坦拱多点支撑加固增强处治前后主拱的应变、挠度、裂缝控制、破坏形态、极限承栽力及支撑纵向钢筋应力指标。从加固前后试验拱的应变、挠度对比分析结果可看出:主拱经增设支撑加固增强处治后,强度、刚度明显提高,在同级荷载作用下,其应变值减少30%~40%,挠度值减少30%50%,新增设的钢筋混凝土Y型支撑能与主拱协调变形、分担部分活载作用效应,提高了主拱的承载力。同时,增设的支撑对主拱裂缝的发展有抑制作用。该加固增强技术提高坦拱桥的承载能力的效
3、果显著,可广泛应用于实践。关键词:桥梁工程;多点支撑;试验;坦拱桥;承载力中图分类号:U444.7文献标识码:AResearchonMulti—pointSupportingStrengtheningFlatArchBridgeZHOUJianting,ZHANGJinquan2,lIENHongwei,LIUQingyang3,WANGLing4(1.ChongqingJiaotongUniversity,Chongqing400074,China;2.ResearchInstituteofHighway,Min
4、istryofCormnunieations,Beijing100088,China;3.ZhongyuOperationBranch,ChongqingExpresswayDevelopmentCo.,Ltd.,Chonhqing400067,China;4.YellowRiverEngineeringConsultingCo.,Ltd.,ZhengzhouHenan450003,China)Abstract:Accordingtotheprinciplesofmulti—pointsupportingstren
5、gtheningflatarchbridge,basedOnthefabricationoftwomodelarchesandtestofthemodelarchesbeforeandafterstrengthening,strain,deflection,crackcontrol,failuremode,maximumbearingcapacityandstressofsupportinglongitudinalbarbeforeandafterflatarchmulti—pointsupportingstren
6、gtheningwerecomparedandanalysed.Fromtheresultsofcomparativeanalysisofthestrainandthedenection,itCanbeconcludedthat(1)thestrengthandstiffnessofthemainarchsupportedbytheadditionalreinforcementcanbeincreasedsignificantly,thestrainandthedeflectionreducedby30%to40%
7、and30%to50%respectivelyunderthesameloadingcondition;(2)thenewY—shapedRCcomponentcanharmonizedeformationandsharepartiallive—loadeffectwithmainarchtoincreasethebearingcapacityofmainarclx(3)theadditionalcomponentcanrestrainthedevelopmentofcracksinthemainarch.Thes
8、trengtheningtechnology,whichcanbewidelyusedinpractice,canimprovethebearingcapacityoftheflatarchbridge.Keywords:bridgeengineering;multi—pointsupporting;test;flatarchbridge;bengcapac
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