复材网格-UHTCC复合增强钢筋混凝土梁抗弯性能试验研究

发布时间：2018-06-11 09:33

本文选题：混凝土梁 + FRP网格　；参考：《土木工程学报》2017年06期

【摘要】：文中进行7根复材(FRP)网格增强超高韧性纤维水泥基(UHTCC)复合加固钢筋混凝土梁的抗弯性能试验,将FRP网格类型、FRP网格增强率、FRP-UHTCC复合层黏结长度作为试验变量,分析各变量对FRP-UHTCC复合增强混凝土梁弯曲性能的影响。在试验研究的基础上,给出FRP-UHTCC复合增强混凝土梁的抗弯承载力计算方法。试验结果表明,FRP-UHTCC复合层与混凝土间没有发生相对滑移现象,可以有效抑制加固层端部剥离破坏,加固梁的破坏模式为FRP网格中纵向纤维筋被拉断破坏。BFRP格栅与UHTCC黏结基体没有发生脱黏现象,优于BFRP编织网与UHTCC的黏结效果。随着FRP网格增强率的增大,加固梁的抗弯承载力得到显著提高。与未加固的普通混凝土梁相比,加固梁的开裂、屈服和极限荷载最大提高幅度分别为97%、35%和33%。计算结果表明,预测值与试验值吻合较好,可以有效地预测FRP-UHTCC复合增强混凝土梁的抗弯承载力。
[Abstract]:The flexural performance test of 7 composite (FRP) gridding reinforced super high toughness fiber reinforced concrete (UHTCC) reinforced concrete beams is carried out. The effect of FRP grid type, FRP mesh reinforcement ratio and FRP-UHTCC composite bonding length on the flexural performance of FRP-UHTCC composite reinforced concrete beams is analyzed. On the basis of the study, the calculation method of bending bearing capacity of FRP-UHTCC composite reinforced concrete beams is given. The experimental results show that there is no relative slip between the FRP-UHTCC composite layer and the concrete, which can effectively restrain the end stripping failure of the reinforced layer. The failure mode of the reinforced beam is broken by the fracture of the.BFRP grid and U in the longitudinal fiber reinforced by the FRP grid. There is no deadhesion in the HTCC bonding matrix, which is better than the bonding effect of the BFRP weave and UHTCC. With the increase of the FRP mesh reinforcement, the flexural capacity of the reinforced beam is significantly improved. Compared with the unreinforced ordinary concrete beams, the maximum increase in the crack, yield and ultimate load of the reinforced beam is 97%, 35% and 33%., respectively. It is shown that the predicted values agree well with the experimental values, which can effectively predict the flexural capacity of FRP-UHTCC composite reinforced concrete beams.
【作者单位】：东南大学;
【基金】：国家自然科学基金(51278441,51578135) 中央高校基本科研业务费专项资金资助江苏省普通高校研究生科研创新计划资助项目(KYLX15_0142)
【分类号】：TU375.1

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