ABSTRACT
This stiffness is assumed to be constant and therefore independent of the value of the bending moment. However, for the cross-section of a concrete beam the moment-curvature diagram is non-linear. This non-linear character is caused by the variable flexural stiffness, as shown in Figure 1. Two cases are shown in this graph : a cross-section with externally bonded FRP (strengthened) and a cross-section without FRP (unstrengthened). An important difference between these cases is the flexural stiffness (slope of lines K
K 1 and K
than without FRP. This different behaviour will influence the moment redistribution of a continuous beam.
