通过 7根 内嵌预应 力螺旋肋钢 丝加 固混凝 土梁静 力试验 研 究,分析 了初 始预应 力水平、加 固量 和开槽尺 寸 3种参 数对加固混凝土梁裂缝性能的影响。基于预应力钢筋混凝土受弯构件裂缝宽度计算公式,对加 固梁最大裂缝宽度进行了 理论研究。研究结果表明:加固梁的开裂荷载随初始预应力水平和加固量的增加而增加,与对比梁相比,开裂荷载最大可 提 高 402% ;最大裂缝 宽度 随初始预应 力水平和加 固量的增加 而减小 ,较对比梁最大裂缝宽度 最大降低 5.48ram;而开槽尺 寸对加 固梁裂缝性能影响较小;研究成果可为工程 实际加固设计提供参考。 关键 词 :混凝 土;内嵌加 固;裂缝 ;螺旋肋钢丝 中图分类号 :TU375 文献标 志码 :A 文章编号 :1672—7029(2013)04—0076—06 Study onthe cracking propertiesofRC beams strengthenedwith nearsurface mounted prestressed helicalribsteelwire ZHANG Chunsheng。, YAN Baoshan ,DING Yahong (1.SchoolofCivilEngineering,HenanPolytechnicUniversity,Jiaozuo454003,China; 2.WuxishiTianyuArchitectural&DesignInstituteCo.Ltd.,Wuxi214000,China) Abstract:Theimpactofthreeparameters,includingtheinitialprestresslevel,theamoventofreinforcementand thesizeofslot,onthecracking propertiesofconcretebeamswasanalyzed,an dthe biggestcrackwidth ofrein- forcedbeamsWas studied theoretically based on theformula ofcrack width abouttheflexuralmembers ofpres— tressed reinforced concrete,through experimental research ofthe seven beam s strengthened with near surface mountedprestressed helicalrib steelwire under monotonous loads. The results show thatthe crack load of strengtheningbeamsincreaseswiththeincreaseoftheinitial prestresslevelandtheamountofreinforcement,and thecrack load can beincreasedby402% compared with the contrastbeam . Thebiggestcrack width decreases with theincreaseofinitialprestressleveland theam ountofreinforcement,an d thebiggestcrackwidth reduces 5.48 mm compared withthe contrastbeam.However,the sizeofslothaslittle effectonthe crackingproperties ofreinforced beams.Th eresearch resultscan providereferencesforthe reinforcementdesign ofpracticalensi— neering. Key words:concrete;nearsurfacemountedreinforcement;crack;helical rib steelwire
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