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Advances in Civil Engineering
/
2020
/
Article
/
Fig 9
/
Research Article
Stiffness and Crack Behavior of Unbonded Posttensioned Concrete Beam Strengthened with Aluminum Alloy Plate
Figure 9
The relationship between Δ
σ
p
/Δ
σ
py
and (M
k
− M
cr
)/(M
y
− M
cr
).