嵌入式FRP筋加固梁抗弯承载力分析

Flexural bearing capacity analysis of strengthened beam with near-surface mounted FRP bars

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。

Based on the damage experimental study on four T-shaped reinforced concrete beams strengthened with near-surface mounted FRP bars under two point static loads, the failure characteristics and mechanical properties of the beams were studied. The effects of FRP bar surface characteristics and FRP bar material types on the failure mode, ultimate bearing capacity and rigidity of the strengthened beams were analyzed. The experimental resuhs show that the strengthening method with near-surface mounted FRP bars can significantly improve the yield load and ultimate bearing capacity of the beam. And the ultimate bearing capacity of the beam strengthened with ribbed CFRP bars is the highest, while the ultimate bearing capacity of the beam strengthened with plain round CFRP bars is the lowest. On the basis of experimental study, the calculation formula of fiexnral bearing capacity of the beams strengthened by near-surface mounted FRP bars under the delamiuation failure mode was established, and the calculated results were in good agreement with the experimental results.