碳纤维布加固钢筋混凝土梁裂缝性能分析

ANALYSIS ON CRACK PERFORMANCE OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH CFRP SHEETS

为了研究钢筋混凝土梁的裂缝扩展规律以及碳纤维布加固对裂缝扩展的影响,建立加固前与加固后钢筋混凝土梁的三维有限元分析模型。对钢筋混凝土梁以及碳纤维布进行受力分析,研究碳纤维布加固对钢筋混凝土梁受力性能与裂缝扩展的影响。结果表明,碳纤维布加固能提高钢筋混凝土梁的受弯承载能力,粘贴一层碳纤维布钢筋混凝土梁的承载力提高了3.4%,粘贴两层碳纤维布的钢筋混凝土梁的承载力提高了6.5%,并能够延缓和抑制裂缝的发展。文中研究结果为今后优化钢筋混凝土梁加固方式提供参考。

In order to study the crack propagation law of reinforced concrete beams and the effect of CFRP reinforcement on crack propagation, a three-dimensional finite element analysis model of unreinforced and reinforced concrete beams was established. This paper analyzes the stress of reinforced concrete beams and carbon fiber cloth and studies the influence of carbon fiber cloth reinforcement on the stress performance and crack propagation of reinforced concrete beams. The results show that the flexural bearing capacity of reinforced concrete beams can be improved by carbon fiber cloth strengthen, in which the bearing capacity of reinforced concrete beams increased by 3.4 % with one layer of carbon fiber cloth and 6.5 % with two layers of carbon fiber cloth, in addition, the development of cracks can be delayed and restrained. The research results of this paper will lay a foundation for optimizing the reinforcement methods of reinforced concrete beams in the future.