Reliability Analysis For RC Beams Shear-strengthened With FRP Based On The Database

With the development of civil engineering, the needs for maintaining and upgrading reinforced concrete(RC) structures are increasing rapidly. Strengthening of deteriorated structures can not only maintain the regular service requirements, but also make full use of the potential of those structures, and bring huge economic benefits and social benefits. Fiber reinforced polymer(FRP) composites, as a new type of strengthening structural materials in civil engineering, has become very popular in rehabilitating and strengthening existing concrete structures, due to its well-known advantages including lightweight, high strength, good corrosion resistance, ease for site handling and no adding weight to repaired members. Nowadays, the application of FRP shear strengthening RC beams is a hot research topic in the current academic field. Shear strengthening RC beams using externally bonded FRP can effectively improve their shear bearing capacity, and avoid the occurrence of brittle failure.After several decades of domestic and foreign research, a large number of tests have been carried on about shear strengthening RC beams, and an amount of calculation models have been proposed. But most of these calculation models are mainly based on a small amount of test results, and because of lacking sufficient theory evidence, they are somehow based on a certain degree of experience so that the applicability and accuracy are not fully guaranteed. Therefore, this paper will collect all the reliable test data home and abroad, so as to establish a database contained 911 experimental results of FRP shear strengthening beam test results. A reliability analysis will be carried out to evaluate each calculation model by error analysis based on the database mentioned before. The main informant are as follows:First, based on the establishment of the database contained 911 experimental results, an error analysis is applied to assess all the selected calculation models for calculation of shear contribution. There comes some conclusion: for U-shaped wrapped of FRP shear-strengthening RC beams, Bukhari et al. 2013 model and Chen and Teng 2003 model for shear contribution(Vf) prediction are more accurate; for fully wrapped of FRP shear-strengthening RC beams, Wang. S. 2007 model and Khalifa and Nanni 2002 model for shear contribution(Vf) prediction are in good agreement; for two-side bonded, Imran A. Bukhari et al.2013 model and Chen and Teng 2003 model for shear contribution(Vf) prediction are guaranteed.Second, Monte-Carlo method is used to analyze the reliability of the model. And based on the above analysist, a parameter(?) is introduced to eliminate the error. It is concluded that the reliability index is positively correlated with the ratio of live to dead load and the partial coefficients of FRP. Among them, the influence of the change of live to dead load ratio on the reliability index is more obvious, and the improvement of the partial coefficient of FRP composites make no difference to the reliability index.Third, throughout all the configuration, the two-side bonded configuration has a maximum reliability index, while the fully wrapped configuration is next, and the reliability index of the U-shaped configuration is the minimum.