342 28 92 2 Wf = (cm) wf=(bf-nfl*tsl)/(nfl+1) K = 4 = 0.07K3nfl4 nfl 1 = 0.125K3 nf1=1 K1 = 4 a <= 4wf a/bf>3 I 2.I Fb =0.55Fy here: b= cm t= cm Fb =