CFRP加固钢筋混凝土短梁抗弯刚度计算方法  

Calculation method on flexural stiffness of reinforced concrete short beam strengthened by CFRP

作　　者：周云[1] 王廷彦[1,2] 张军伟[3] Zhou Yun;Wang Tingyan;Zhang Junwei(Guangzhou University,Guangzhou 510006,China;North China University of Water Resources and Electric Power,Zhengzhou 450045,China;Henan Agricultural University,Zhengzhou 450002,China)

机构地区：[1]广州大学,广东广州510006 [2]华北水利水电大学,河南郑州450045 [3]河南农业大学,河南郑州450002

出　　处：《土木工程学报》2020年第11期9-20,35,共13页China Civil Engineering Journal

基　　金：国家自然科学基金(50579068);国家重点研发计划资助(2017YFC0703600)。

摘　　要：通过7个碳纤维增强复合材料(Carbon Fiber Reinforced Polymer,CFRP)加固钢筋混凝土短梁的受弯试验,得出CFRP加固钢筋混凝土短梁在加载全过程的抗弯刚度曲线,分析抗弯刚度全过程曲线规律,采用合理计算假定,提出CFRP加固钢筋混凝土短梁抗弯刚度全过程曲线的计算方法。按文章方法对抗弯刚度进行计算并与试验值对比,结果表明,所提计算方法计算精度好,该方法既可用于CFRP加固短梁也可用于普通短梁的抗弯刚度计算。采用文章提出的抗弯刚度计算方法,运用数值积分原理自编MATLAB程序计算CFRP加固钢筋混凝土短梁的转角,计算值与试验值对比表明,自编程序合理且计算精度高,抗弯刚度计算方法可用于CFRP加固钢筋混凝土短梁的转角计算,转角计算也验证了抗弯刚度计算方法的合理性和适用性。The bending tests of seven reinforced concrete(RC)short beams strengthened by CFRP were carried out,and the flexural stiffness curves in their whole loading processes were obtained and analyzed.Based on the assumption of reasonable calculation,the calculation method on flexural stiffness curve for the short beam strengthened by CFRP was proposed.The calculation results show that this proposed method has good accuracy and can be used to calculate the flexural stiffness of short beams with or without CFRP.Based on the flexural stiffness calculation method and the numerical integration principle,a self-developed MATLAB program was used to calculate the rotation angle of the RC short beam strengthened by CFRP.A comparison indicates that the calculated rotation angles agree well with the tested angles.The flexural stiffness calculation method can be used for the RC short beam strengthened by CFRP.The calculation of rotation angle validated the rationality and applicability of the calculation method on flexural stiffness.

关 键 词：钢筋混凝土短梁 碳纤维布 受弯试验 抗弯刚度 转角 

分 类 号：TU375.1[建筑科学—结构工程] TU317.2