CFRP布加固钢筋混凝土梁抗弯承载力设计计算方法

Calculation Method of Flexural Capacity of Reinforced Concrete Beams with Externally Bonded CFRP Sheets

为完善公路钢筋混凝土桥梁抗弯加固设计理论,针对CFRP布加固钢筋混凝土梁的受力机理和破坏特点,结合我国现行《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)的设计理论,基于国内文献有关CFRP布加固梁的抗弯试验研究成果,建立了CFRP布加固桥梁的抗弯承载力计算公式,并提出了加固后梁承载力的提高程度、碳纤维布最大用量和最小用量的限制要求。公式计算值与试验值的对比结果表明,所建议公式具有较好的实用性和安全性,可用于公路钢筋混凝土桥梁的抗弯加固设计计算。

In order to improve and validate a new design approach for flexure strengthened bridges, according to the flexural behaviour and failure modes of RC beams strengthened with externally bonded CFRP sheets ard combining with the code for design of highway reinforced and prestressed concrete bridges and culverts （JIG D62-2004）, the flexural capacity formulas of strength calculation are established based on the flexural experimental results about CFRP reinforcement.The limit of carrying capacity improvement, maximum and minimum areas of CFRP is also suggested. The effectiveness of the design approach is then validated by comparing the experimental results with the calculated flexural capacity, and the proposed design approach is highly practical and reliable for strengthened bridge calculation.