Response Modification Factor of RC Frames Strengthened with RC Haunches

Figure 16

Bilinear idealizations of force-displacement capacity curves. (a) Model-5, as-built [19]. (b) Retrofitted, scheme-1. (c) Retrofitted, scheme-2. Elastoplastic idealization of capacity curves. First, the maximum displacement capacity of models was identified. The yield force and yield displacement were varied to equalize the area under the elastoplastic curve to that of actual curve. The yield stiffness was checked not to vary much in comparison to initial stiffness.

(a)

(b)

(c)