:HRB500E是我 国新开发 的一种高强抗震 钢筋 ,目前 国内对其 工程应用研 究还处 于起步 阶段 。关于配 置 HRB500E的钢筋砼梁 柱组 合体 的抗震性 能还缺乏 相关 的试 验研究 ,因此 ,本 文参照现行 相关规 范设计 了 4 个钢筋砼梁柱组合体足尺试件 ,其 中 2个配 置 HRB500E,另 2个配置 HRB335,并对 这些试 件进行 了低周往 复 加载试验 。对配置 HRB500E的试 件在裂缝发展 、破坏形态 、滞 回特性 、耗能 、延性 和刚度退化 等方 面与等体积 配置 HRB335的试件作了对比分析。结果表明:配置 HRB500E的钢筋砼梁柱组合体与配置 HRB335的钢筋砼 梁柱组合体存在着类似的破坏现象,同时两者均具有 良好的延性。但配置 HRB5OOE的钢筋砼梁柱组合体有更 高的承载力、变形能力和耗能能力 ,表现出了良好的抗震性能。 关键词:高强抗震钢筋 ; 梁柱组合体; 低周往复加载; 抗震性能 中图分类号 :TU375 文献标 识码 :A 文章编号 :2095-0985(2014)04-0038-06 Study oftheSeismicBehaviorofConcreteBearn .column Sub-assemblagesReinforeedwith HRB500E SteelBars MA Jian ,咫 ⅣG Yun.dong 。GAO Fe .WANGSi.qi (1.a.SchoolofCivilEngineeringandMechanics:b.HubeiKeyLaboratoryofControlStructure, Huazhong University ofScience and Technology,W uhan430074,China; 2.ChinaHighwayPlanningandDesignInstituteConsultants,INC,Beijing100055,China) Abstract:Atpresent,theresearchofHRB500E ,anew kindofhigh strength seismicreinforcement, isverylimited. No experimentalstudiesyetreported in the literature have investigated the seismic behaviorofRC beam-columnjoint.Inthispaper,atotaloffourfull—scalespecimensofconcrete beam.column sub—assemblages were fabricated. instrumented and tested undercyclic low.frequent loading. Among them , two specimens were reinforced with HRB5OOE, while the others were reinforced with HRB335. The crack development,collapse mode,hysteretic characteristics,energy dissipation,ductilityand stiffness degradation obtained from experimentwere analyzed. The results show thatconcrete beam-column sub—assemblagesreinforced with HRB500E have a similarcollapse mode with those reinforced with HRB335. In addition, all of the specimens, regardless of their differentkinds ofreinforcement,have a good ductile behavior. Furthermore,specimens reinforced with HRB500E have a higherbearingcapacity,deform ation capacity and energy dissipation,which indicatethattheyhave abetterseismic perform ance. Keywords:hJighstrengthseismicreinforcement;beam—columnsub—assemblages;cyclicandlow—frequent loading;seismic perform ance 高强钢筋与普通钢筋相 比强度高 ,能减少钢 筋使用量。若能推广使用 ,既能通 过高强度来提 高结构的安全储备 ,又能带来一系列的经济效益 和社会效益。据测算,以 HRB400替代 目前大量
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