碳纤维布加固钢筋混凝土短梁受弯试验及承载力计算

通过11根不同跨高比碳纤维（carbon fiber reinforced polymer, CFRP）布加固钢筋混凝土梁的受弯试验，研究了跨高比、纵筋配筋率和CFRP布层数对钢筋混凝土梁极限荷载的影响。结果表明：CFRP布加固钢筋混凝土梁的受弯破坏主要有CFRP布拉断和受压区混凝土压碎两种模式；随跨高比的减小，CFRP布加固钢筋混凝土梁极限荷载显著增加；随纵筋配筋率和CFRP布层数的增加，CFRP布加固钢筋混凝土梁极限荷载显著提高。结合文中和已有文献的试验结果，提出了反映跨高比影响的CFRP布加固钢筋混凝土短梁受弯承载力计算方法，该方法既可用于CFRP布加固的钢筋混凝土短梁也可用于浅梁的受弯承载力计算。

Flexural test and calculation on capacity of reinforced concrete short beam strengthened by CFRP sheets

The flexural tests of eleven reinforced concrete beams strengthened by carbon fiber reinforced polymer (CFRP) sheets with different span-depth ratios were conducted to investigate the influences of span-depth ratio, ratio of longitudinal reinforcement and amount of CFRP sheets on ultimate load of reinforced concrete beams. The experimental results show that: the failure modes of reinforced concrete beams strengthened by CFRP sheets are CFRP sheets fracture and concrete crushing; with the decrease of span-depth ratio, the ultimate load of reinforced concrete beams strengthened by CFRP sheets is improved significantly; with the increase of ratio of longitudinal reinforcement and number of CFRP sheets, the ultimate load of reinforced concrete short beams strengthened by CFRP sheets is also improved significantly, respectively. Based on the experimental results of this paper and others, the calculation method on flexural capacity of reinforced concrete beams strengthened by CFRP sheets was proposed, which considers the effects of span-depth ratio and can be used to calculate the flexural capacity of reinforced concrete short beams strengthened by CFRP sheets and reinforced concrete shallow beams strengthened by CFRP sheets.