CFRP加固钢筋混凝土梁抗弯极限承载力计算  

Evaluation of Ultimate Bearing Capacity of Bending of CFRP Strengthened RC Beam

作　　者：张路[1] 宁贵霞[1] 丁南宏[1] 李敏峰[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《兰州交通大学学报》2010年第6期35-39,共5页Journal of Lanzhou Jiaotong University

基　　金：甘肃省自然科学基金(3ZS042-B25-032)

摘　　要：经碳纤维增强材料(CFRP)加固后的钢筋混凝土构件,其受力特点和破坏模式与原构件不同.基于平截面假定及《混凝土结构设计规范》推荐的混凝土、钢筋材料应力-应变关系,分析了加固梁弯曲破坏时的极限状态,针对钢筋屈服后混凝土压碎和钢筋屈服后CFRP材料达到允许拉应变两种弯曲破坏模式,提出极限破坏发生的条件及考虑CFRP初始应变的极限承载力计算公式.通过对某CFRP加固矩形截面钢筋混凝土梁抗弯极限承载力的计算,且与现行的计算方法所得抗弯极限承载力比较,本文公式更能反映梁体的实际受力状况,且计算结果也更加合理.为CFRP加固钢筋混凝土梁抗弯设计和工程应用提供了理论依据.The loading capacity and failure mode of reinforced concrete components after strengthened with CFRP are different from the original components.The ultimate state of bending failure of the reinforced beam is analyzed on the basis of the presumption of plan sections and the stress-strain relationships of concrete and steel recommended in the code for design of concrete structures.For the two bending failure modes of concrete crushing after steel yielded and carbon fiber reinforced plastic reaching the allowed tensile strain after steel yielded,the condition of ultimate failure and the evaluation formula considering of initial strain of ultimate bearing capacity are presented.The comparison of calculation results of ultimate bearing capacity of bending of CFRP strengthened rectangular cross-section reinforced concrete beam between the present formula and the existing calculation method dedicates that the present formula offers a more practical reflection of strained condition and the results are more reasonable.It also offers a theoretical basis for the bending design of CFRP strengthened RC beams and engineering applications.

关 键 词：钢筋混凝土梁 加固 CFRP 初始应变 抗弯极限承载力 

分 类 号：TU375.1[建筑科学—结构工程] TU312