模拟不中断交通状况下粘贴碳纤维布加固钢筋混凝土梁试验研究

AN EXPERIMENTAL STUDY OF RC BEAMS STRENGTHENED WITH CFRP SHEETS UNDER SIMULATED CONTINUOUS TRAFFIC LOADS

为了调查动荷载作用下碳纤维布与钢筋混凝土梁的粘贴性能及加固效果,进行了5根模拟交通荷载(等幅正弦波形动荷载)作用下粘贴碳纤维布加固钢筋混凝土梁和1根保持荷载下粘贴碳纤维布加固钢筋混凝土梁以及2根对比梁的试验研究。试验中考虑了混凝土等级、配筋率、有无锚固条、粘贴长度、荷载幅值5个变化参数。试验结果表明,在模拟交通荷载的作用下,碳纤维布加固的钢筋混凝土梁粘贴性能满足要求,粘贴效果良好。在模拟交通荷载后的静载作用下,试验梁的抗弯承载力提高较多,加固效果明显,进一步验证了粘贴效果。

To investigate the bond performance and flexural strength of R.C. beams strengthened with CFRP sheets under dynamic loads, five reinforced concrete （RC） beams with epoxy-bonded carbon fiber reinforced plastic （CFRP） sheets were loaded with sinusoidal fatigue loads that simulate traffic loads. One RC beam strengthened with CFRP sheets under sustaining loads and two contrastive RC beams were also experimentally investigated. Variables considered in this experimental program includes compressive strength of the concrete, reinforcement ratio, anchorage system, bonded length, and load range. The dynamic results generally indicate that the flexural strength of the repaired beams under simulated traffic loads is increased, and bond performance between CFRP and RC beams is good. The results also demonstrate the feasibility of rehabilitating and strengthening damaged RC beams with CFRP sheets while the beams are under dynamic loads. The static test program shows that the application of CFRP to RC beams results in increased strength and enhanced performance.