Page - 1046 - in Book of Full Papers - Symposium Hydro Engineering

COMMISSION INTERNATIONALE DES GRANDS BARRAGES ------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ------- EXPERIMENTAL STUDY ON DIRECT SHEAR BETWEEN FRP - CONCRETE INTERFACE BASED ON DIC ZHANG LEI1, LEI DONG2, WU LINGCHENG3, YANGYONG1 1. YELLOW RIVER INSTITUTE OF HYDRAULIC RESEARCH, YRCC; 2. HOHAI UNIVERSITY; 3. YELLOW RIVER WANJIAZHAI WATER MULTI- PURPOSE DAM PROJECT CO., LTD CHINA 1. INTRODUCTION Stress can be transmitted effectively between FRP and concrete, which is the key for FRP-concrete to effectively improve the bearing capacity of the reinforced structure. Numerous tests and engineering projects have shown that the failure of FRP-concrete tends to be caused by the de-bonding of FRP-concrete interface or local failure along the interface of the concrete [1,2]. Consequently, the bond performance of FRP-concrete interface directly determines whether the reinforced structure will succeed. Under most external load conditions, this interface tends to be in the state of shear stress. Currently, there are four types of experimental study to test bond performance of FRP-concrete interface, which is simple-shear test, double-shear test, beam test and corrected beam test. Simple- shear test and double-shear test are most common for their specific and simple stress state. This essay adopts single-shear test to deeply discuss and research on the mechanical property and bond mechanism of FRP-concrete. Van Gemert [3] researched the bond performance of steel-plate reinforced concrete structure through double-shear test for the first time in 1980. Besides, he presented the values of maximum shearing stress and average shearing stress, and the transmission law of stress distribution and calculation formula of steel plate-concrete interface. Later, based on simple-shear test, Sharma [4] and his fellows focused their research on the influence of the effective bonding length of FRP-concrete interface on the bond strength. When above shear tests measured the stress strain of steel plate or FRP plate, they stuck large quantities of strain gauges on the plate surface alongside the length direction of plate and then read 1046