1 Introduction
2 Experimental Program
2.1 Specimen Preparation
Test parameters | Types |
---|---|
Corrosion area | Corrosion of entire area (A) Corrosion of a half the area (H) Corrosion in the center of specimen (C) Corrosion on the side of the specimen (S) |
Corrosion level (average corrosion weight loss) | 3, 5, and 10 % |
W/C (%) | S/a (%) | Unit weight (kg/m3) | AE |
f
c
′ (MPa) |
E
c
(GPa) | |||
---|---|---|---|---|---|---|---|---|
Water | Cement | Fine aggregate | Coarse aggregate | |||||
55 | 46.0 | 170 | 309 | 837 | 1005 | Cement ×0.4 % | 34.5 | 27.2 |
Type of reinforcement |
F
y
, (MPa) |
F
u
(MPa) |
E
s
, (GPa) | Elongation (%) |
---|---|---|---|---|
D13 (ϕ 13 mm, 126 mm2) | 461.02 | 444 | 196 | 21.3 |
2.2 Test Procedure
3 Results and Discussion
3.1 Reinforcement Corrosion and Crack Development
3.2 Tension Stiffening Effects of Concrete
3.3 Bond Strength and Slip
4 Numerical Analysis
4.1 Finite Element Analysis
4.2 Results of Finite Element Analysis
4.3 Proposed Bond Elements
Maximum bond strength (τ
s, max
, MPa) | Bond shear stiffness (D
s
, MPa) | |
---|---|---|
0 ≤ ΔW ≤ ΔWc
|
\( \tau_{s,max} = 0. 3 4\sigma_{B} - 1. 9 3 \)
|
\( D_{s} = \, 0. 2 40 7 { }\left( {\tau_{max} } \right)^{ 1. 7 5 3 4} \)
|
ΔW ≥ ΔWc
|
\( \tau_{c,max} = \tau_{s,max} ( 1. 30 6e^{ - 0.0 9 4 8W} ) \)
|