Flexural Behaviour of Unbonded Posttensioned Concrete Beam Strengthened with Aluminium Alloy Plates

Table 6

Comparison of displacement ductility of specimens.

No.	After strengthening				First failure
	β0	u (mm)	y (mm)	μ	u (mm)	y (mm)	μ
AL1	0.13	83	139	1.67	24	141	5.88
AL2	0.17	52	90	1.73	46	141	3.07
AL3	0.24	39	67	1.72	46	86	1.87
AS1	0.16	87	106	1.22	43	154	3.58
AS2	0.23	74	120	1.62	64	116	1.81
AS3	0.26	70	90	1.29	53	72	1.36