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311 Ch15
 

311 Ch15

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    311 Ch15 311 Ch15 Presentation Transcript

      • VII.) Design of Compact Steel Beams
      • A.) Introduction
      • The allowable stress depends on how well the compression flange is supported out of plane. The distance between lateral supports is called the unbraced length.
      • Compact means that the unbraced length (out of plane) is less than L c .
      • L c is the maximum length for which a given W-section can be considered Compact. (See AISC beam table)
    •  
      • B.) Compact Beam Design Method
      • 1.) Determine the location and magnitude
      • of the loads and draw a load diagram.
      • 2.) Draw the shear and moment diagrams
      • to find the maximum shear and
      • moment in the beam.
      • 3.) Calculate the required section modulus:
      • S req’d = M = M , if L < L c
        b,allow 0.66  y 4.) Select the lightest beam available with L c > L and S x > S req’d .
      • a.) Enter AISC beam selection table
      • under the S x column.
      • b.) Find the lightest beam in bold
      • letters with S x > S req’d. The bold
      • letters indicate the lightest beam
      • available for a given range of S x.
      c.) Check the L c > L, if not, chose a heavier beam.
      • 5.) Add the moment due to the self-weight
      • of the selected beam to the maximum
      • moment and again check that
      • S x > S req’d. If not, repeat step 4.
      • 6.) Check that  v = V < 0.4  y
      A Note: F y is the symbol for yield strength in the AISC handbook.
    •