海水环境下碳纤维增强复合材料加固预损伤钢筋混凝土梁抗弯性能试验研究

EXPERIMENT ON THE BENDING PERFORMANCE OF CFRP REINFORCED PRE-DAMAGED REINFORCED CONCRETE BEAM UNDER SEAWATER ENVIRONMENT

通过对碳纤维增强复合材料(CFRP)加固预损伤钢筋混凝土梁及经海水腐蚀的CFRP加固预损伤钢筋混凝土梁的抗弯性能试验,对比研究了海水侵蚀对试验梁破坏形态、裂缝开展情况、应变发展及抗弯承载力等的影响规律。试验结果表明,采用CFRP对机械损伤钢筋混凝土梁进行加固处理,可以有效地提高其抗弯承载力和刚度,约束裂缝的开展。随着海水腐蚀时间的延长,CFRP加固损伤梁的各方面性能受到明显的影响,但仍具有较为可靠的加固效果,且混凝土应变符合平截面假定的条件。

Experimental study on the bending performance of pre-damaged reinforced concrete beams strengthened with bonding CFRP under air and seawater environment was carried out in this contribution.The influence of seawater on the damage mode,cracks development,strain development and bending capacity,and so on of the strengthened beams were measured.Based on the experimental results,it was found that the bending capacity and stiffness of the strengthened pre-damaged beams were improved effectively.And development of cracks was limited.Although their performances were decreased obviously with time prolonged under seawater environment,the effect of reinforcement was still reliable.Finally,it should be pointed out that during the test,strain of the concrete complied with the plane-section assumption.