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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。
In order to study the influence of reinforcement ratio and longitudinal reinforcement strength on the shear behavior of RPC without web reinforcement, four test beams with different longitudinal reinforcement configurations were made and subjected to quarter-point loading test. By observing the whole test process and analyzing the data of deflection and longitudinal reinforcement strain in the process of loading, the influence of longitudinal reinforcement configuration on the shear strength and shear ductility of the test beam is obtained. The experimental results show that the shear strength of RPC reinforced concrete beams increases with the reinforcement ratio at a fixed shear span ratio, and decreases slightly with the decrease of the longitudinal reinforcement strength. Reinforcing the rate of increase can not only improve the longitudinal reinforcement and RPC pin role, but also can improve the diagonal crack at the top of the concrete compression zone height, and to improve the longitudinal reinforcement strength can only increase the concrete compression zone height, so to improve the reinforcement ratio Improve the strength of the longitudinal ribs can effectively improve the component shear capacity.