The method of carbon fiber reinforced polymer (CFRP) strengthening is a technique that is rapidly developed and used for strengthening of steel structures in recent years. Most previous research in the area of CFRP strengthening of steel structures has been conducted on the behavior of flawless steel structures. Based on the author's knowledge, the behavior of CFRP-strengthened deficient square hollow section (SHS) steel beams under concentrated and distributed loads has not been studied. Therefore, this study aims to investigate the behavior and performance of CFRP-strengthened deficient SHS steel beams under concentrated and distributed loads. Finite element method (FEM), using ANSYS, has been employed for modeling of steel beams. Ten steel beams, two non-strengthened steel beams and eight CFRP-strengthened steel beams have been analyzed. The results indicate the dimensions and number of composite layers is being effective on the ultimate capacity of the SHS steel beams. Also, the results have shown that in deficient steel beams CFRP can significantly be recovered the strength lost due to deficiency.

中文翻译：

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碳纤维布加固对集中和分布荷载下不足钢梁的影响。

碳纤维增强聚合物（CFRP）的加固方法是近年来发展迅速的技术，用于加固钢结构。先前在钢结构的CFRP加固领域中的大多数研究都是针对无缺陷钢结构的行为进行的。基于作者的知识，尚未研究CFRP加固的不足方形空心截面（SHS）钢梁在集中和分布荷载下的性能。因此，本研究旨在研究CFRP加固的SHS钢在集中和分散荷载作用下的性能。使用ANSYS的有限元方法（FEM）已用于钢梁建模。分析了十根钢梁，两根非加强钢梁和八根CFRP加强钢梁。结果表明，复合层的尺寸和数量对SHS钢梁的极限承载力有效。而且，结果表明，在不足的钢梁中，CFRP可以显着地恢复由于不足而导致的强度损失。