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通过碳纤维片材加固钢筋混凝土简支梁的受弯试验及文献中相关试验,研究了预载水平及剪/弯承载力比对纤维片材初始剥离荷载的影响。对本文试验及文献中发生剥离破坏的碳纤维片材加固钢筋混凝土梁的试验研究,分析结果表明:(1)随剪/弯承载力比的增大,加固梁纤维片材的初始剥离荷载也随之增大;但当剪/弯承载力比值较小,即受剪承载力富裕度较小的情况下,纤维片材可能会在低于设计极限承载力时发生剥离破坏;(2)加固时预载水平的大小对碳纤维片材加固钢筋混凝土梁的极限荷载和CFRP片材初始剥离时的荷载影响不大。因此加固设计时必须充分考虑加固构件的受剪承载力对剥离破坏的影响,以避免纤维剥离这一脆性破坏模式的发生。
The effect of pre-load level and shear / flexural capacity ratio on the initial peel load of fiber sheet was studied by bending test of carbon fiber sheet reinforced concrete simply-supported beam and literature related experiments. The experimental research and experimental study of the reinforced concrete beams strengthened by carbon fiber sheet with peeling failure in this paper and the literature shows that: (1) With the increase of shear / bending capacity ratio, the initial peel load of reinforcing fiber sheets However, when the shear / bending capacity ratio is small, that is, the shear strength is low, the fiber sheet may be peeled and damaged when the ultimate bearing capacity is lower than the design limit. (2) The size of the preload has little effect on the ultimate load of CFRP sheets and on the initial load of CFRP sheets. Therefore, the reinforcement design must take full account of the shear strength of the reinforcement member on the impact of stripping failure in order to avoid the occurrence of fiber brittle failure mode.