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时间:2020-03-23
《配箍对盐冻环境下钢筋混凝土黏结性能的影响.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、2016年第8期(总第322期)混凝土理论研究Number8in2016(TotalNo.322)ConcreteTHEORETICALRESEARCHdoi:10.3969/j.issn.1002-3550.2016.08.003配箍对盐冻环境下钢筋混凝土黏结性能的影响徐港1,2,张小龙2,谢晓娟2,卫泽众2(1.黄冈师范学院建筑学院,湖北黄冈438000;2.三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌443002)摘要:研究了盐冻环境下不同配箍率试件的钢筋混凝土黏结性能劣化特性。设计了无箍筋和两类配箍试件,在同时经历15、25、
2、30、45、50、60、70、75、80次盐冻融循环作用后,采用中心拉拔试验测试了其黏结性能,探究了盐冻融损伤和配箍率对黏结强度特征值、滑移量及黏结滑移关系的影响。结果表明:试件的黏结破坏形态主要取决于配箍率,而与盐冻融作用次数的关系不大;随着盐冻次数的增加,钢筋混凝土间的初始、开裂和极限黏结强度近似呈线性降低,黏结应力峰值滑移量呈线性增大,黏结刚度逐渐降低;经历相同盐冻融循环次数后,试件配箍率越高黏结强度、刚度及滑移量损失越小,配制箍筋可显著补强盐冻融作用导致的钢筋混凝土黏结性能退化。关键词:盐冻循环;黏结滑移;拉拔试验;配箍率中图分类号:T
3、U375.1文献标志码:A文章编号:1002-3550(2016)08-0011-03Effectofstirrupsonbondpropertybetweensteelbarandconcreteunderdeicer-frostingenvironmentXUGang1,2,ZHANGXiaolong2,XIEXiaojuan2,WEIZezhong2(1.SchoolofArchitecture,HuanggangNormalUniversity,Huanggang438000,China;2.CollaborativeInnovatio
4、nCenterforGeo-hazardsandEco-EnvironmentinThreeGorgesArea,Yichang443002,China)Abstract:Itstudiedtheeffectofdeicer-frostingenvironmentonbondpropertydegradationbetweensteelbarandconcreteofdifferentstirrupratiospecimensbyexperiments.Specimenswithoutstirrupsandtwoclassesofhoopeds
5、pecimensweredesigned.After15,25,30,45,50,60,70,75and80fastdeicer-frostingcycles,thebondbehaviorofthreekindsofspecimensweretestedbyaxialpull-outexperme-nts.Theeffectofdeicer-frostinginjuryandstirrupratioonbandstrengthcharacteristicvalue,slippageandbond-sliprelationshipwereex-
6、plored.Thetestresultsshowthatthebondfailuremodeofspecimensmainlydependsonstirrupratioanddeicer-frostingcyclesnumberhaslittlerelationshiptothebondfailuremode.Withtheincreaseofdeicer-frostingcyclesnumber,theoriginalslipbondstrength,crackingstrengthandultimatebondstrengthofthes
7、pecimensbetweensteelbarandconcretedecreaseapproximatelylinearly,peakslipincreaseslinearly,bondstiffnessdecreasesgradually.Afterthesamenumberofdeicer-frostingcycles,thehigherstirrupratiois,thelessbondstrength,bondstiffnessandslippagelose,stirrupscanenhancedegradedbondproperty
8、betweensteelbarandconcretegreatlywhichcausedbydeicer-frostingcycles.Keyword
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