Calculation method for the maximum crack width of FRP bar reinforced concrete flexural member based on experimental data analysis
Dong Zhiqiang1 Wu Gang1,2
1.Key Laboratory for Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China;
2.National Prestress Engineering Research Center, Southeast University, Nanjing 210096, China
Abstract：Because the fiber-reinforced polymer (FRP) bars are non-metallic and corrosion-resistant, the limit of maximum crack width specified in Chinese code is relaxed to be 0.5 mm when they are used as inner reinforcements of concrete members. In current Chinese code, however, applying the formulas generally used for ordinary RC members to calculating the maximum crack width of FRP reinforced concrete (RC) members is questionable, since the values of those parameters in the formulas have not been verified by experimental data. Hence, in this work, based on the principle for calculating the maximum crack width and the measured data of FRP RC flexural members collected from literatures, a comprehensive check and revision for those parameters (including the relative bonding characteristic coefficient νi, the uniform coefficient of strain of tensile FRP bar ψ, the ratio of maximum crack width to average crack width τs, the magnification coefficient due to the long-term loading effect τl and the influencing coefficient of the tensile effect of concrete on the crack width αc) was carried out. It is shown that the proposed modified formula for the maximum crack width is more reliable and reasonable, and can be referred in the further revisions of Chinese code.
董志强 吴刚 . 基于试验数据分析的FRP筋混凝土受弯构件最大裂缝宽度计算方法[J]. 土木工程学报, 2017, 50(10): 1-8.
Dong Zhiqiang Wu Gang. Calculation method for the maximum crack width of FRP bar reinforced concrete flexural member based on experimental data analysis. 土木工程学报, 2017, 50(10): 1-8.
