PROBABILISTIC-BASED DETERMINATION OF THE EMBEDDED LENGTH OF GFRP ROD IN CONCRETE
As for splitting failures, the embedded length of GFRP rods in concrete is determined,from the probabilistic point of view, for design purposes. In the development of limit state function,concrete strength, embedded length, GFRP strength and the diameter of GFRP rod are treated as random design variables in addition to computational uncertainty factor. The Rackwitz-Fiessler method is then applied to carry out reliability analysis, accompanied by a parametric study on concrete strength, fc GFRP strength, ffu, environmental reduction factor, CE, and additional target reliability index, β0. As a result of the analysis, a value of 0.030 is proposed for K in the determination of the embedded length of GFRP rod in concrete with β0=1.098. For other values of β0,K could be calculated directly by the proposed linear relation between K and β0. The parametric study shows that the mean-to-nominal ratios, κc, and κf, of concrete strength and GFRP strength are the significant influencing factors among all the statistics. As κc, increases 1.0 to 2.0, K would decrease nonlinearily up to 29.3%. As κf increases from 1.1 to 1.5, K would increase up to 40.9% and 89.5% for GFRP rod with normal distribution and the Weibull distribution, respectively. The coefficient of variation (C.O.V.) of concrete strength is only about 3.4%. The C.O.V. Of GFRP strength is found to be negligible. The proposed K is strongly related to exposure conditions and FRP type. As CE increases from 0.5 to 1.0, K decreases substantially up to 50%, from 0.048 to 0.024.
Fiber reinforced polymer rod Bond Concrete Embedded length Splitting failure
Zheng He Guo-Wen Tian
College of Resources and Civil Engineering, Northeastern University, Shenyang 110004,P.R. China
国际会议
第十届国际结构工程青年学者研讨会(The Tenth International Symposium on Structural Engineering for Young Experts)
长沙
英文
736-742
2008-10-19（万方平台首次上网日期，不代表论文的发表时间）