Calculation Method on Bending Crack in RC Beams Strengthened with FRP
Calculation Method on Bending Crack in RC Beams Strengthened with FRP
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发表时间：
2006
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通讯作者：
Yuan Xu-bin
中科院分区：
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作者：
Yuan Xu-bin
针对纤维增强复合材料（FRP）对钢筋混凝土（RC）梁裂缝的限制作用理论探讨和定量分析较少的问题，根据混凝土裂缝理论，建立了FRP加固RC梁开裂过程的表达式，并通过5根模型FRP加固T梁的试验，在理论研究和试验研究中均考虑了初始荷载对裂缝的影响，结果表明，FRP粘结应力是引起裂缝宽度和间距变化的主要原因，而粘结应力的变化对裂缝宽度和间距的变化有一定的影响。减小了裂缝宽度和裂缝间距，并将加固后钢筋混凝土梁的开裂过程分为两个阶段，最后提出了一种改进的FRP加固钢筋混凝土梁裂缝宽度计算方法。
Aimed at the problem of less theoretical discussion and quantitative analysis on the restriction of fiber-reinforced polymer(FRP) to the crack of reinforced concrete(RC) beams,according to concrete crack theory,the expression of the cracking process of RC beams strengthened with FRP was founded.Based on the experiment of five model T-beams strengthened with FRP,the crack width and spacing in different load levels were quantitatively analyzed.The effect of initial load to crack was considered both in the theoretical study and the experimental study.The result shows that the bond stress of FRP is the main cause to lessening crack width and spacing,and the cracking process of the strengthened RC beams can be divided into two phases.Finally,an improved method of calculating crack width of RC beams strengthened with FRP was suggested.