1. Special Pavement Technology Center, Jiangsu SinoRoad Engineering Research Institute, Nanjing 211805, China 2. College of Civil Avlation, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
This research investigated a pavement system on steel bridge decks that use epoxy resin (EP) bonded ultra-high performance concrete (UHPC). Through FEM analysis and static and dynamic bending fatigue tests of the composite structure, the influences of the interface of the pavement layer, reinforcement, and different paving materials on the structural performance were compared and analyzed. The results show that the resin bonded UHPC pavement structure can reduce the weld strain in the steel plate by about 32% and the relative deflection between ribs by about 52% under standard axial load conditions compared to traditional pavements. The EP bonding layer can nearly double the drawing strength of the pavement interface from 1.3 MPa, and improve the bending resistance of the UHPC structure on steel bridge decks by about 50%; the bending resistance of reinforced UHPC structures is twice that of unreinforced UHPC structure, and the dynamic deflection of the UHPC pavement structure increases exponentially with increasing fatigue load. The fatigue life is about 1.2 × 107 cycles under a fixed force of 9 kN and a dynamic deflection of 0.35 mm, which meets the requirements for fatigue performance of pavements on steel bridge decks under traffic conditions of large flow and heavy load.
a steel plate with a thickness of 14 mm, an RB waterproof layer with a thickness of 3 mm and UHPC with a thickness of 50 mm
20.94
3.78
0.9
II
a steel plate with a thickness of 14 mm, an RB waterproof layer with a thickness of 3 mm, an EP bonding layer with a thickness of 1 mm and UHPC with a thickness of 50 mm
32.64
4.41
0.7
III
a steel plate with a thickness of 14 mm, an RB waterproof layer with a thickness of 3 mm, an EP bonding layer with a thickness of 2 mm and UHPC with a thickness of 50 mm
34.85
4.76
0.9
IV
a steel plate with a thickness of 14 mm, an RB waterproof layer with a thickness of 3 mm and reinforced UHPC with a thickness of 50 mm
66.45
2.80
0.7
V
a steel plate with a thickness of 14 mm, an RB waterproof layer with a thickness of 3 mm, an EP bonding layer with a thickness of 1 mm and reinforced UHPC with a thickness of 50 mm
68.54
1.94
0.8
Tab.4
Fig.8
Fig.9
pavement structure
force (kN)
dynamic deflection (mm)
fatigue loading (number of cycles)
failure mode
EA bonding materials and EA concrete with a thickness of 50 mm
9
0.54
> 1.2 × 10 7
undamaged
an RB waterproof layer and UHPC with a thickness of 50 mm
9
0.43
112
separation
an RB waterproof layer, a wet bonding layer with a thickness of 1 mm and SFRC with a thickness of 50 mm
9
0.41
3.33 × 10 6
mid-span cracking
an RB waterproof bonding layer, a wet bonding layer with a thickness of 1 mm and UHPC with a thickness of 50 mm
9
0.35
> 1.2 × 10 7
undamaged
Tab.5
Fig.10
Fig.11
structural layer
length, Z (mm)
width, X (mm)
thickness, Y (mm)
elastic modulus (MPa)
Poisson’s ratio
UHPC pavement layer
11.25
6
0.050
0?50000
0.25
waterproof and bonding layers
11.25
6
0.006
1000
0.2
steel bridge plate
3.75 × 3
6
0.014
210000
0.3
diaphragm
0.01
6
0.84
210000
0.3
U-shaped rib
11.25
0.6
0.28
210000
0.3
Tab.6
Fig.12
Fig.13
1
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