HRB500钢筋混凝土桥墩承载能力及延性性能研究

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1、桥梁建设2015年第45卷第3期(总第232期)58BridgeConstruction，Vo1．45，No．3，2015(TotallyNo．232)文章编号：1003—4722(2015)03—0058—05HRB500钢筋混凝土桥墩承载能力及延性性能研究张健新，李艳艳。，戎贤(1．河北工业大学土木工程学院，天津300401；2．河北省土木工程技术研究中心，天津300401)摘要：为研究剪跨比、钢筋强度及箍筋间距对混凝土桥墩承载能力及延性性能的影响，设计了4个混凝土实心墩试件(3个试件配置了HRBS00钢筋、

2、1个试件配置了HRB335钢筋)，采用拟静力加载方案进行恒定轴压力作用下的低周往复加载试验，分析试件破坏特征、承栽能力、延性性能、滞回曲线及耗能能力。研究表明：剪跨比较大的试件呈弯曲破坏形态，剪跨比较小的试件呈弯剪破坏形态；对于剪跨比较大的桥墩，配置HRB500钢筋的试件比配置HRB335钢筋的试件具有更高的承载能力和延性性能，配置HRB500的钢筋能够改善试件的滞回性能；增加箍筋间距能够提高配置HRB500钢筋试件的承载能力和延性性能。关键词：桥墩；HRB500钢筋；剪跨比；钢筋强度；箍筋间距；承载能力；延性中

3、图分类号：U443．22；U422．55文献标志码：AStudyofBearingCapacityandDuctilityBehaviorofRCBridgePiersArrangedwithHRB500SteelBarsZHANGJian—xin～，LIYan—yan～，RONGXian，(1．SchoolofCivilEngineering，HebeiUniversityofTechnology，Tianjin300401，China；2．CivilEngineeringTechnologyResearchC

4、enterofHebeiProvince，Tianjin300401，China)Abstract：Tostudytheinfluencesoftheshear—to～spanratios，steelbarstrengthandstirrupspacingonthebearingcapacityandductilitybehaviorofreinforcedconcrete(RC)bridgepiers，4specimensofthesol~dRCpiers(3specimenswerearrangedwitht

5、heHRB500steelbarsand1withtheHRB335steelbars)weredesignedandprepared．Thelow—cyclerepeatedloadingtestsweremadeforthespecimensundertheconstantaxialcompression，usingtheschemeofthequasi—staticloadingandthefailurecharacteristics，bearingcapacity，ductilitybehavior，hy

6、stericcurvesanden—ergydissipatingcapacityofthespecimenswereanalyzed．Theresultsoftheanalysisindicatethataspecimenhavingthegreatshear—to——spanratioexhibitstheflexuralfailurepatternwhileaspecimenhavingthelittleshear—to—spanratioexhibitstheflexuralshearfailurepat

7、tern．AsfortheRCbridgepiershavingthegreatshear—to—spanratios，thespecimensarrangedwiththeHRB500steelbarscanhavegreaterbearingcapacityandductilitybehaviorthanthespecimenwiththeHRB335steelbarswillhave．ThearrangementoftheHRB500steelbarscanimprovethehystericbehavio

8、rofthespecimensandtheincreaseofthestirrupspacingcanimprovethebearingcapacityandductilitybe—haviorofthespecimenswiththeHRBS00steelbars．Keywords：Bridgepier；HRB500steelbar；shear—to—spanratio