Advances in Civil Engineering

Research Article

Stiffness and Crack Behavior of Unbonded Posttensioned Concrete Beam Strengthened with Aluminum Alloy Plate

Table 4

Calculation results of elastic-plastic stiffness coefficient.
No.Mcr (MPa)fcr (mm)Ms (MPa)fs (mm)β′
SL26516108310.19
SL36011100190.23
SS1452875620.18
SS2422070400.22
SS3391965340.23