预应力CFRP加固混凝土梁的预应力体系研究现状

General overview of prestressing system to strengthen reinforced concrete beams with prestressed CFRP

预应力CFRP(含外贴片材与内嵌线材)加固混凝土梁是一种新型的加固方法。近年来,国内外研究人员对预应力CFRP加固混凝土梁进行了很多富有成果的试验和理论研究,但是对可用于加固实际工程的CFRP预应力体系的研究尚不成熟。预应力CFRP加固混凝土梁预应力张拉体系研究方面主要存在实际应用中的可操作性不强,体系加固混凝土构件的有效性等研究不足;预应力CFRP加固混凝土梁预应力锚固体系研究方面主要存在锚具的有效性缺陷、可操作性困难以及预应力损失较大等。对国内外预应力CFRP板加固混凝土梁的最新研究成果进行较为系统的综述与分析,并对将来的发展趋势进行展望。

It is a new method of strengthen reinforced concrete beams with prestressed CFRP(laminate stuck outside and tendon near-surface-mounted).In recent years,domestic and foreign researchers have done many fruitful tests and theoretical investigations on prestressed CFRP to strengthen reinforced concrete beams.But the prestressing system used for strengthening structure engineering in practice is still not mature.The current tensioning system of prestressed CFRP reinforced concrete beams is not practical,and the efficiency of it is influenced.Meanwhile,the current anchor for prestressed CFRP tendon is unreliability,poor operability and large prestress loss,etc.This paper summarizes the up-todate achievements of concrete beams strengthened with prestressed CFRP(laminate stuck outside and tendon nearsurface-mounted).Furthermore,the future of CFRP is prospected.