Nominal strength
The strength design approach requires that the design flexural strength of a member exceed its required factored moment as indicated by Eq. (10-1). The design flexural strength φMn refers to the nominal strength of the member multiplied by a strength reduction factor, and the factored moment Mu refers to the moment calculated from factored loads (for example, αDLMDL + αLLMLL +...)
φMn ≥ Mu (10-1)
This guide recommends that the factored moment Mu of a section be calculated by use of load factors as required by ACI 318-05. In addition, an additional strength reduction factor for FRP, ψf, should be applied to the flexural contribution of the FRP reinforcement alone, Mnf, as described in Section