Stiffness and Crack Behavior of Unbonded Posttensioned Concrete Beam Strengthened with Aluminum Alloy Plate

Table 2

Initial damage of each damaged beam.

No.	Cracking load (kN)	Ultimate load (kN)	Maximum crack width (mm)	Number of cracks		Initial prestress (MPa)
				Front	Back
SL1	80	204	5	13	12	1570
SL2	60	180	1	16	16	1570
SL3	44	200	0.3	18	20	1570
SS1	40	84	2	17	16	1361
SS2	30	104	0.2	19	18	1570
SS3	34	118	0.4	20	20	1570