预应力超高性能混凝土梁抗震性能试验研究.pdf

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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