This paper presents the experimental and numerical analysis of damaged steel beams strengthened with prestressed CFRP sheet or only strengthened with CFRP sheet. The test results showed that damaged level had a significant effect on the stiffness, yield load, and ultimate bearing capacity. And using prestressing CFRP sheet to strengthen damaged steel beam could increase the ultimate bearing capacity. The numerical analysis results showed that the damaged level had a significant effect on the stiffness and ultimate bearing capacity. The strengthened steel beam with the damaged level could exceed the steel beam without damage by about 10% in the ultimate bearing capacity. The ultimate bearing capacity would increase about 8% when the flange or web thickness increased per 1 mm. The ultimate bearing capacity would increase about 3% when the thickness or width of CFRP sheet increased per 0.05 mm or 10 mm. The bearing capacity would increase about 1.5% when the prestressed degree increased about 7%.

中文翻译：

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预应力CFRP板加固损伤钢梁的试验与数值分析

本文介绍了用预应力碳纤维板加固或仅用碳纤维板加固的受损钢梁的实验和数值分析。试验结果表明，损伤水平对刚度、屈服载荷和极限承载力有显着影响。并采用预应力碳纤维布加固受损钢梁，可提高极限承载力。数值分析结果表明，损伤程度对刚度和极限承载力有显着影响。损伤等级的加强钢梁的极限承载力可超过无损伤钢梁10%左右。当翼缘或腹板厚度每增加 1 mm 时，极限承载力将增加约 8%。CFRP板的厚度或宽度每增加0.05mm或10mm，极限承载力增加3%左右。预应力增加7%左右，承载力提高1.5%左右。