## 2 Materials and Methods
### \"Unit T-Beams\" with Open Hoop CFRP Strips Employing CFRP Anchor Ropes
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{\begin{tabular}{c} **Code Name of** \\ **Specimen** \\ \end{tabular} } & \begin{tabular}{c} **Maximum Value** \\ **of the Total** \\ **Measured Axial** \\ **Load (KN)** \\ \end{tabular} & \begin{tabular}{c} **Average Strain from** \\ **Both Sides of the Strip** \\ **at Maximum Load** \\ \end{tabular} & \
\begin{tabular}{c} **Total Axial Load (kN)** \\ **Obtained from the Average** \\ **CFRP Axial Strains Measured** \\ **at Maximum Load** \\ \end{tabular} & \multirow{2}{*}{**Mode of Failure**} \\  &
\begin{tabular}{c} **Mode of Failure** \\ **of Failure** \\ **of Failure** \\ \end{tabular} \\ \hline (1) & (2) & (3) & (4) & (5) \\ \hline SW600C/1 No 1 & & & & Fracture of anchor \\
1 layer CFRP *, & 60.88 & 3900 & 60.42 &
\begin{tabular}{c} Fracture of anchor \\ rope at upper corner \\ \end{tabular} \\ single anchor rope ** & & & & \\ SW600C/1 No 2 & & & & \\
1 layer CFRP *, & 68.76 & 4400 & 68.16 &
\begin{tabular}{c} Delamination of FRP \\ strips from anchor \\ \end{tabular} \\ single anchor rope ** & & & & \\ SW600C/1 No 3 & & & & Fracture of anchor \\
1 layer CFRP *, & 68.72 & 4400 & 68.16 &
\begin{tabular}{c} Fracture of anchor \\ rope at upper corner \\ \end{tabular} \\ single anchor rope ** & & & & \\ SW600C/2 No 1 & & & & \\
1 layer CFRP *, & 79.46 & 5200 & 80.55 & Fracture of FRP strip \\ double anchor rope ** & & & & \\ SW600C/2 No 2 & & & & \\
1 layer CFRP *, & 97.18 & 6400 & 99.14 & Fracture of FRP strip \\ double anchor rope ** & & & & \\ SW600C/2 No 3 & & & & \\
1 layer CFRP*, & 61.86 & 4200 & 65.06 & Fracture of FRP strip \\ double anchor rope ** & & & & \\ SW600C/2 No 4 & & & & \\
1 layer CFRP *, & 105.98 & 5300 & 82.10 & Fracture of FRP strip \\ double anchor rope** & & & & \\ \hline \hline \end{tabular}  
* * 1 layer CFRP strip Area A1 = 33.1 mm\({}^{2}\). ** CFRP Anchor Rope Area A2 = 28.0 mm\({}^{2}\).  
\end{table} 
Table 3: Measured tensile capacity of open hoop CFRP strips anchored with CFRP ropes. (2) A relatively large SDEV value in the axial tensile load capacity results can be seen when double anchor ropes are used. This indicates a degree of uncertainty in achieving desired high values of tensile bearing capacity when applying a relatively large number of anchor ropes. The largest measured tensile capacity when using double anchor ropes is equal to 105.98 kN, which represents a 60% increase from the measured average capacity when using a single anchor rope. At the same time, the smallest bearing capacity when using double anchor ropes is equal to 61.86 kN, which represents a 7% decrease from the measured average capacity when using a single anchor rope. This should be attributed to the interaction between the anchor ropes and the CFRP strip at the common bond surface and should be investigated further. (d2) Reasonably good agreement can be seen by comparing the measured total maximum load values (column 2 of Table 3) with the corresponding values calculated in the way described earlier (column 4 of Table 3), with the exception of the specimen listed in the last row of Table 3. It can be again concluded that for design purposes it is very important to be able to ascertain with confidence the axial strain level that can be assumed to be able to be sustained in these CFRP strips. Towards this objective, it is important to approximate the effectiveness of the bonding surface or of a specific anchoring device and on this basis to adopt the appropriate axial strain value for the CFRP strips.