Page - 1052 - in Book of Full Papers - Symposium Hydro Engineering

Fig.6 The strain of FRP plates along the plate length at the limit load We can see from Fig. 6 as follows: (1) The strain distribution law of FRP plate of each specimen is consistent. (2) The maximum strains of specimen SS-120 and specimen SS-180 are relatively small for influence of clamping chuck of testing machine. (3) Apart from some factors that influence the test results, and combined with the analysis of FRP-concrete specimen of each plate length, we can predict that: the maximum strain of each specimen under extreme load increases as the bonding length of FRP plate increases; the strain distribution law curve along the length direction of plate extends outwards as the bonding length of FRP plate increases. 3.3. COMPARISON WITH THE FORMULA OF THE SHEAR BOND STRENGTH MODEL OF CHEN - TENG The Chen-Teng [13] anti-shear boding strength equations based on fracture mechanics theories and experimental outcomes are adopted to compare with the testing outcome. Fig. 7 shows the comparison between the ratio of FRP plate stress and its tensile strength /frp frpf and the ratio of bonding length of FRP plate and effective bonding length /frp el l during de-bonding failure in direct shearing tests. Fig. 7 The bond strength of different bond length in direct shear test We can see from Fig. 7 as follows: 1052