不同配箍率下HRB500级纵筋活性粉末混凝土梁抗剪性能研究  

RESEARCH ON SHEAR PERFORMANCE OF HRB500 REINFORCED RPC BEAM WITH DIFFERENT STIRRUP RATIO

作　　者：王强[1,2] 金凌志[2] 李月霞[2] 吕海波[1,2] 

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《工业建筑》2016年第9期66-70,共5页Industrial Construction

基　　金：国家自然科学基金资助项目(51368013);广西重点实验基金项目(11-CX-04);广西自然科学基金项目(2012GXNSFBA053148)

摘　　要：为研究配箍率对HRB500级钢筋活性粉末混凝土(RPC)梁的抗剪性能的影响,对5根配置不同箍筋的梁进行四分点加载试验。通过观察试验过程,以及对加载过程中挠度、箍筋应变等数据进行分析,得出配箍率对HRB500级钢筋RPC梁抗剪承载力与剪切延性的影响规律。试验结果表明:随着配箍率的增加,试件斜裂缝的分布规律由少而集中变为多而分散,同级荷载下的裂缝宽度变得更细,箍筋起到抑制裂缝开展的作用;梁中配置箍筋不仅可以提高构件抗剪承载力,同时还能提高其剪切延性,效果明显;钢纤维在抵抗由温度、弯曲等荷载形成的均匀应力时作用明显,当抵抗由集中荷载为主所产生的剪应力时则不能取代箍筋的作用。To study the effect of stirrup ratio on the shear performance of HRB500 reinforced RPC beam,five specimens were tested which had different stirrup ratio. The whole test process was observed. The beam＇s deflection and stirrup strain were analyzed. The change regulation of the beam＇s shear strength and ductility was drawn. The test results showed that by the increase of stirrup ratio,the number of diagonal cracks increased and their distribution became more and more scattered. Their width became thinner in the same load. Stirrup limited the development of diagonal cracks. The stirrup could both improve the beam＇s shear strength and shear ductility obviously. The steel fiber could effectively resist uniform stress from temperature and bending load. But when the shear stress came from concentrated force,steel fiber could not replace stirrup in the beam.

关 键 词：配箍率 HRB500级钢筋 活性粉末混凝土 抗剪承载力 剪切延性 

分 类 号：TU377[建筑科学—结构工程]