Effects of Seawater Corrosion and Freeze-Thaw Cycles on Mechanical Properties of Fatigue Damaged Reinforced Concrete Beams

Table 12

Bending stiffness analysis.

Fatigue	Specimen	Initial stiffness	amplitude reduction	Yield stiffness	amplitude reduction	Ultimate stiffness	amplitude reduction
load level		kN⋅m^2		kN⋅m^2		kN⋅m^2
0	A1	414	0	190	0	89	0
	B1	343	17.1%	130	31.6%	68	23.6%
	C2	318	23.2%	104	45.3%	57	36.0%
0.2	A4	341	0	190	0	82	0
	B3	324	5.0%	131	31.1%	55	32.9%
	C3	260	23.7%	95	50.0%	53	35.4%
0.3	A6	298	0	152	0	79	0
	B6	320	−7.4%	110	27.6%	53	32.9%
	C5	245	17.8%	91	40.1%	48	39.2%