预应力碳纤维布加固钢筋混凝土梁的抗弯承载力分析

Analysis of flexural capacity of RC beams strengthened with prestressed CFRP sheets

混凝土结构加固技术一直是国内外研究的热点问题.近年来纤维增强复合材料被广泛应用于混凝土结构加固中.通过对预应力碳纤维(CFRP)布加固钢筋混凝土梁的受力过程进行分析,结合我国现行规范,假定加固梁的截面应变符合平截面假定,依据不同阶段的平衡方程、几何方程和物理方程,系统推导出每个阶段钢筋混凝土梁截面的弯矩-曲率关系式和抗弯承载力计算式.

The strengthening technology of concrete structure is a hot point which has been studied in home and abroad. In recent years, the fiber reinforced plastic has been widely applied in strengthed concrete structure. The paper through the analysis of the entire force process of RC beams strengthened with prestressed CFRP sheets, combinates with the fundamental assumption of the current code, and based on different stages of the balance equation, geometrical equation and physical equation, then systematically derives the formulae of moment - curvature and bearing capacity for each stage.