Effects of Stiffener Type on Fatigue Resistance of Steel-UHPC Composite Bridge Decks

Table 3

Maximum stress amplitude of each detail (unit: MPa).

Scheme	Stress amplitude				UHPC
	Detail 1	Detail 2	Detail 3	Detail 4
	SX	SY	S1	S1	SX	SY
(1) OSD	95	161	132	96	—	—
(2) UCD-U	28.6	34.4	74	77	1.7	8.1
(2) Decrease compared with (1)	70%	79%	44%	20%	—	—
(3) UCD-B	10.5	21.9	67	55	2.3	8.2
(3) Decrease compared with (1)	89%	86%	49%	43%	—	—

Note. SX is the transverse normal stress of bridge. SY is the longitudinal normal stress of bridge. S1 is the principal stress.