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考虑不同的初始荷载,对二次受力条件下未加固开单孔梁和碳纤维布(CFRP)加固开单孔梁的受力性能进行了试验研究。研究结果表明,与未开孔RC梁相比,二次受力下各开孔梁的承载力随着初始荷载的增大有明显下降的趋势,当初始荷载分别为未开孔梁承载能力极限荷载的20%、40%、60%时,其承载能力极限荷载分别降低了14.8%、19.0%、23.7%,破坏时梁底部钢筋均未发生屈服,呈剪切破坏状态。而碳纤维布加固开孔梁的承载能力极限荷载与未开孔梁相比下降幅度不超过3%,破坏时底部钢筋屈服,与未开孔梁一样呈弯曲破坏形态,加固效果明显。
Considering different initial loads, the experimental research on the mechanical behavior of single-hole beams strengthened with single-hole beams and carbon fiber sheets (CFRP) under the second force was carried out. The results show that compared with unopened RC beams, the bearing capacity of each perforated beam under the second force tends to decrease with the increase of initial load. When the initial load is the ultimate bearing capacity of unopened beam When the load is 20%, 40%, 60%, the ultimate load of bearing capacity decreases by 14.8%, 19.0% and 23.7%, respectively. However, the ultimate load of CFRP-reinforced open-ended beam does not decrease by more than 3% compared with that of the un-perforated beam. At the time of failure, the yielding of the bottom rebar is bent like the un-perforated beam and the reinforcement effect is obvious.