Check the flexural strength either phiMn for LRFD Enter the 'W-section Beam Selection by Zx' chart and find the beam Where Mu = Mn/Omega = FyZx, thus Zx = Mu/Fy.ģ. Where Mn/Omega = Mu and solve for the required plastic section modulus, Zx. For ASD set theĭesign moment equal to the Nominal Moment, Mn divided by the safety factor Omega Where Mu = phiMn = FyZx, thus Zx = Mu/Fy. Phi where phiMn = Mu and solve for the required plastic section modulus, Zx. The design moment equal to the nominal moment, Mn multiplied by the safety factor Calculate the required plastic section modulus of the beam. The design loading on the beam should also include the beam's own weight asĢ. Moment, Mu and the design shear, Vu are calculated. From the combination loading on the beam, eitherįactored loading for LRFD or the unfactored loading for ASD the required design The fastest and easiest way to design a steel beam is to use the beam selection Steel Beam Design Using The 14th Edition AISC Steel Construction Manual:ġ. All calculationsĬan be performed for Load Resistance Factor Design, LRFD or Allowable Strength Design, The 14th edition of the AISC Steel Construction Manual. This design guide and the corresponding calculations are based on This design guide is intended to provide guidance for the safe and economical design
