Page - 1050 - in Book of Full Papers - Symposium Hydro Engineering

(3) Later load stage: the position of peak value ( =0.00408yy ) of strain basically remains unchanged compared to middle load stage and the strain of free end only reaches 0.001. 3.2. EXPERIMENTAL DATA ANALYSIS (1) Load - displacement curve of specimen The load - displacement curve of specimens can be obtained from the data of the test machine, as shown in fig.3 (for example, specimen ss-120). Fig.3 The load-displacement curve of the specimen ss-120 (2) Extreme bearing capacity, slippage of load end and failure mode measured in the test Collect each specimen according to the extreme capacity of interface (direct shearing strength) as shown in Fig. 4. Fig. 4 The ultimate direct shear strength distribution of FRP- concrete specimen with different bond length We can see from Fig. 4 that except for specimen SS-80, with the bonding length increases, the extreme bearing capacity of interface firstly increases (the bonding length is 110mm) and then demonstrates stable trend. Although the bonding length of specimen SS-80 is only 80mm, its extreme bearing capacity of interface is quite high. It might be that the FRP plate is stuck right at the place with concentrated coarse aggregate and there is relative little mortar in this part. As for 1050