Failure Modes (a) over-reinforced under-reinforced b) 0= As() bho steel content 目土本工程学院 5 over-reinforced under-reinforced few steel content Mu 0 f M My C ρ>ρb B ρmin<ρ<ρb A ρ<ρmin (%) bh0 As  = Failure Modes 5