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CFRP加固混凝土梁抗弯极限承载力的计算分析
引用本文:王荣国,代成琴,刘文博,张晓晶.CFRP加固混凝土梁抗弯极限承载力的计算分析[J].哈尔滨工业大学学报,2002,34(3):312-314,319.
作者姓名:王荣国  代成琴  刘文博  张晓晶
作者单位:1. 哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨,150006
2. 黑龙江省信息中心,黑龙江哈尔滨,150036
基金项目:黑龙江省科技厅攻关项目 (G0 0A110 5 1)
摘    要:分析碳纤维加固梁的受力特征、确定其极限承载力,是加固工程的首要问题,通过对已承载结构的分析,发现其存在二次受力问题,即SFRP滞后现象,为此,在计算加固梁的抗弯极限承载力时,引入了CFRP强度发挥系数概念,并在确定加固梁极限弯矩的基础上,建立了极限弯矩与CFRP厚度的关系式,研究结果表明:对已承载结构,为提高加固效率,在加固前应尽量卸载,加固用CFRP厚度存在临界值to,当CFRP厚度超过临界值to时,对加固结构不但无益,反而有害。

关 键 词:CFRP加固  混凝土梁  碳纤维  加固结构  极限承载力  计算  分析  影响因素  极限弯矩  加固层厚度
文章编号:0367-6234(2002)03-0312-03

Calculation and Analysis of Limit Flexural Loading of CFRP Strengthened Concrete Beams
WANG Rong guo ,DAI Cheng qin ,LIU Wen bo ,ZHANG Xiao jing.Calculation and Analysis of Limit Flexural Loading of CFRP Strengthened Concrete Beams[J].Journal of Harbin Institute of Technology,2002,34(3):312-314,319.
Authors:WANG Rong guo  DAI Cheng qin  LIU Wen bo  ZHANG Xiao jing
Affiliation:WANG Rong guo 1,DAI Cheng qin 2,LIU Wen bo 1,ZHANG Xiao jing 1
Abstract:Preloaded structures demonstrate a second loading phenomenon that produces the hysteresis of CFRP. Therefore the concept of effective CFRP strength coefficient is introduced for calculation of limit flexural loading of strengthened beams, and on the basis of limit bending moment determination, the relationship of CFRP thickness and limit bending moment is established. It is concluded from the resulfs of analysis, that in order to improve the strengthening efficiency of preloaded structures, service load should be removed before strengthening; for strengthening purpose, CFRP thickness displays a critical value t 0, and it does harm rather than good to the strengthened structures if CFRP thickness surpasses the critical value t 0.
Keywords:carbon fiber  strengthened structures  limit load  calculation and analysis  influence factors  
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