FRP型材加固混凝土梁抗弯性能计算方法  

Calculation Method on Flexural Capacity of FRP Profile Reinforced Concrete Beams

作　　者：卢志芳[1] 张强[2] 曹玉贵[1] 罗峰 刘沐宇[1] LU Zhi-fang;ZHANG Qiang;CAO Yu-gui;LUO Feng;LIU Mu-yu(Hubei Key Laboratory of Roadway Bridge&Structure Engineering,Wuhan University of Technology,Wuhan 430070,China;China Railway Major Bridge Reconnaissance&Design Institute Group Co,Ltd,Wuhan 430050,China)

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [2]中铁大桥勘测设计院集团有限公司,武汉430050

出　　处：《武汉理工大学学报》2021年第12期54-58,共5页Journal of Wuhan University of Technology

基　　金：湖北省重点研发计划(2020BAB081,2020BCB065).

摘　　要：针对现有理论不能准确计算FRP型材加固钢筋混凝土梁抗弯性能的问题,根据平截面假定和内力平衡方程,考虑FRP型材全截面受力,推导了FRP型材加固钢筋混凝土梁的抗弯承载力计算公式和抗弯短期刚度计算公式,并通过试验数据对计算公式准确性进行验证。结果表明,FRP型材加固钢筋混凝土梁抗弯承载能力计算公式和短期抗弯刚度计算公式的计算值与试验值吻合较好,可用于FRP型材加固钢筋混凝土梁抗弯性能的分析计算。研究结果为FRP型材加固钢筋混凝土梁的应用提供了理论依据。Aiming at the problem that reinforced concrete beams reinforced with FRP sheets can only effectively improve the flexural bearing capacity,the effect of improving its flexural rigidity is not significant.This paper proposed a method of strengthening reinforced concrete beams with FRP profiles.In view of the fact that the existing calculation method of reinforcement bearing capacity wass not applicable.Based on the assumption of the plane section and the internal force balance equation and considering the full section force of the FRP profile,this paper proposed a formula for calculating the flexural capacity of reinforced concrete beams with FRP profiles and carried out an experimental study on the flexural performance of reinforced concrete beams.The results show that the deformation of the mid-span section of the concrete beam after the FRP profile reinforcement conforms to the as-sumption of a flat section.There is no peeling and relative slip between the interface of FRP profile and concrete beam.The theoretical value of the flexural bearing capacity of concrete beams strengthened with FRP profiles is in good agreement with the experimental values,and the error is 7.5%.It verifies the correctness of the calculation formula.The research results provide a theoretical basis for strengthening reinforced concrete beams with FRP profiles.

关 键 词：FRP型材 钢筋混凝土梁 抗弯承载力 抗弯短期刚度 

分 类 号：F403.3[经济管理—产业经济]