Table 5.

Characteristic values of the tensile test for the specimens.

No.	Ultimate Load (kN)	Tensile Strength (MPa)	${\mathit{f}}_{\mathit{m}\mathit{s}\mathit{t}}^0/{\mathit{f}}_{\mathit{s}\mathit{t}\mathit{k}}$	Fracture Zone
S1-1	133.76	591.36	1.10	Weld heat-affected zone
S1-2	136.15	601.92	1.11
S1-3	133.68	591.01	1.09
S2-1	136.83	604.93	1.12	Predetermined failure zone
S2-2	136.71	604.40	1.12
S2-3	136.23	602.28	1.12
S3-1	137.23	606.70	1.12
S3-2	136.97	605.55	1.12
S3-3	136.47	603.34	1.12

Note: $f_{mst}^0$ represents the measured tensile strength of the specimen, while $f_{stk}$ represents the standard value for the ultimate tensile strength of the steel reinforcement. The f_stk value of the HRB400 grade steel bar is 540 MPa.