配筋率和纵筋强度对RPC无腹筋梁抗剪性能的影响  

Influence of Different Reinforcement Ratio and Strength on Shear Performance of RPC Beam without Web Reinforcement

作　　者：王强[1] 曹霞[1] 彭金成[1] 金凌志[1] 

机构地区：[1]桂林理工大学,土木与建筑工程学院,广西桂林541004

出　　处：《建筑科学》2016年第3期71-75,88,共6页Building Science

基　　金：国家自然科学基金项目(51368013);广西重点实验基金项目(11-CX-04);广西自然科学基金项目(2012GXNSFGA060001)

摘　　要：为研究配筋率及纵筋强度对RPC无腹筋梁抗剪性能的影响,制作了4根仅纵筋配置不同的试验梁,进行四分点加载试验。通过观察整个试验过程,以及对加载过程中挠度、纵筋应变等数据进行分析,得出纵筋配置对该试验梁抗剪承载力与剪切延性的影响规律。试验结果表明:在某一固定剪跨比下,RPC钢筋混凝土梁抗剪承载力随着配筋率的增加而增加,随着纵筋强度的降低略有降低。配筋率的提高不仅能提高纵筋与RPC的销栓作用,同时也能提高斜裂缝顶部混凝土受压区高度,而提高纵筋强度只能提高混凝土受压区高度,故提高配筋率比提高纵筋强度更能有效提高构件抗剪承载力。To study the effect of shear capacity and ductility of RPC beam without web reinforcement in different reinforcement ratio and strength,four specimens are tested which have different reinforcement. The whole test process is observed. The beam＇s deflection,reinforcement strain,etc are analyzed. The change regulation of the beam＇s shear strength and ductility is drawn. The test results shows that the shear capacity of RPC beam can be increased by the increase of reinforcement ratio and decreased slightly by the decrease of reinforcement strength when the beam＇s shear span ratio is certain. The increase of reinforcement ratio can not only improve dowel action but also enlarge concrete compression area which locates at the top of the inclined crack. The improvement of reinforcement strength can only change the area. So the increase of reinforcement ratio is more effective to improve the beam＇s shear capacity.

关 键 词：配筋率 纵筋强度 活性粉末混凝土 抗剪承载力 剪切延性 

分 类 号：TU378.2[建筑科学—结构工程]