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通过两点静力荷载作用下3根表层嵌贴FRP筋加固的钢筋混凝土T形损伤梁的试验,研究了嵌入式FRP筋加固梁的破坏特征和受力性能。分析了FRP筋表面特征和FRP筋材料种类对加固梁破坏模式、极限承载力、刚度等方面的影响。试验结果表明:嵌入式FRP筋加固方法能显著提高梁的屈服荷载和极限承载力;加固量一定时,带肋CFRP筋加固梁的极限承载力最高,光圆GFRP筋加固梁的极限承载力最低。在试验研究的基础上,建立了剥离破坏模式下嵌入式FRP筋加固梁的抗弯承载力计算公式,计算结果与试验结果吻合较好。
The test of three T-shaped reinforced concrete beams strengthened with FRP tendons under two static loads is carried out. The failure characteristics and mechanical properties of the reinforced FRP tendons are studied. The effects of the surface features of FRP bars and the types of FRP bars on the failure mode, ultimate bearing capacity and stiffness of the reinforced beams were analyzed. The results show that the reinforcement method of embedded FRP tendons can significantly improve the yield load and ultimate bearing capacity of the beam. When the amount of reinforcement is fixed, the ultimate bearing capacity of the beam with ribbed CFRP tendons is the highest, and the ultimate bearing capacity of GFRP tendons reinforced with the beam is the lowest . Based on the experimental study, the formula for calculating the flexural capacity of reinforced RC beams with embedded FRP bars is established. The calculated results are in good agreement with the experimental results.