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大小:2.64 MB
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时间:2020-03-25
《预应力超高性能混凝土梁抗震性能试验研究.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、桥梁建设2016年第46卷第6期(总第241期)BridgeConstruction.V01.46,No.6,2016(TotallyNo.241)29文章编号:1003—4722(2016)06—0029—06预应力超高性能混凝土梁抗震性能试验研究邓宗才,王义超(北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124)摘要:将高强钢筋用于超高性能混凝土(UHPC),可充分发挥两者的高强性能。为了解预应力度和配筋率对预应力高强钢筋UHPC梁抗震性能的影响,设计制作了3根预应力和1根非预应力UHPC梁,进行低周反复荷载试验,分析各梁的抗震破坏形态、滞回曲线、骨架曲线、
2、延性指标、刚度退化、耗能能力和变形恢复能力,探讨预应力度和换算配筋率对梁抗震性能的影响规律。结果表明:非预应力和中等预应力度UHPC梁具有良好的抗震性能和延性性能,高预应力度UH—PC梁具有较好的抗裂能力和变形恢复能力;提高预应力度会降低梁的耗能能力,改善变形恢复能力,但对刚度退化速率影响不大;提高换算配筋率可减缓刚度退化速率,降低梁的耗能能力,但对变形恢复能力影响不大。关键词:超高性能混凝土;高强钢筋;预应力;抗震性能;预应力度;配筋率;延性;刚度退化中图分类号:TU378.2;U448.35文献标志码:AExperimentalStudyofSeismicBehaviorofUH
3、PCBeamsReinforcedwithPrestressingHigh_-StrengthSteelBarsDENGZong—cai。WANGYi—chao(KeyLaboratoryofUrbanandEngineeringSafetyandDisasterReductionofMinistryofEducation,BeijingUniversityofTechnology,Beijing100124,China)Abstract:Theapplyingofthehigh—strengthsteelbarstOtheultra—highperformanceconcrete(
4、UHPC)structurecanbringtheadvantagesofthehighstrengthofthesteelbarsandtheUHPCintofullplay.TohaveanunderstandingoftheinfluencesoftheprestressingdegreesandsteelbarratiosontheseismicbehavioroftheUHPCbeamsreinforcedwiththeprestressinghigh—strengthsteelbars,3prestressedand1non—prestressedUHPCbeamswer
5、edesignedandcastandthelow—cyclerepeatedloadtestsforthebeamsweremade.Theseismicfailuremodes,hystereticcurves,skeletoncurves,ductilityindices,rigiditydegradationandtheenergydissipationanddeformationrecoverycapacityofthedifferentbeamswereanalyzedandthelawsoftheinfluencesofthepres~tressingdegreesan
6、dtheconversedsteelbarratiosontheseismicbehaviorofthebeamswerestud—ied.TheresultsindicatethattheUHPCbeamsthatarenon—prestressedandthathavethemediumprestressingdegreeshavegoodseismicandductilitybehaviorwhilethebeamsthathavethehighprestressingdegreeshavegoodcrack—resistantanddeformationrecoverycap
7、acity.Theincreaseoftheprestressingdegreescandecreasetheenergydissipationcapacityofthebeamsandimprovethedeformationrecoverycapacity,buthaslittleinfluenceontherigiddegradationrates.Theincreaseoftheconversedsteelbarratioscanretardthe
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