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采用国内新近研究的具有应变硬化特征的超高韧性水泥基复合材料(UHTCC)代替普通混凝土材料,进行了4组不同配筋率共12个钢筋增强超高韧性水泥基复合材料(RUHTCC)梁的弯曲试验,根据梁理论计算了RUHTCC受弯梁在起裂、屈服以及极限破坏时对应的弯曲承载力,并以跨中挠度、曲率及能量为表征参数计算了构件的延性。与试验结果的比较表明:理论与试验结果吻合较好;RUHTCC梁可提高普通钢筋混凝土梁的承载力和延性,减少钢筋用量。因此,在箍筋配置过密或对结构延性要求较高的结构关键部位如预应力锚索区和梁柱节点等,UHTCC有着更为广泛的推广应用前景。
In this paper, we use UHTCC, a newly developed strain-hardening ultrahigh-toughness cementitious matrix composite instead of ordinary concrete, to conduct a series of 12 reinforcement reinforced ultrahigh toughness cementitious matrix (RUHTCC) beams with different reinforcement ratios Bending test, the corresponding bending capacity of RUHTCC bent beam during initiation, yielding and ultimate failure was calculated according to the beam theory. The ductility of the member was calculated with the mid-span deflection, curvature and energy as parameters. The comparison between the experimental results and the experimental results shows that the theoretical and experimental results agree well with each other. The RUHTCC beams can improve the bearing capacity and ductility of common reinforced concrete beams and reduce the amount of steel. Therefore, the UHTCC has a wide range of applications in the key parts of the structure such as prestressed anchor zone and beam-column joints where the configuration of stirrups is too dense or require high structural ductility.