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Web Crippling under Point Loading or Reaction
Review Report
Shape ksi fy= Beam d = in. R = t = L0 = in. in. in.
Result Pr = kips
Beam Supports
Stiffeners (Channel) b1 = in. t1 = d1 = Fys = in. in. ksi in. R1 = c1 = in.
Loading N = in.
Beam Fastening to Supports


  Types of Loading or reaction C3.4.1

    One-flange loading or reaction - the clear distance between the bearing edges of adjacent opposite concentrated loads or reactions > = 1.5h
    Two-flange loading or reaction - the clear distance between the bearing edges of adjacent opposite concentrated loads or reactions < 1.5h

    End loading or reaction - the distance from the edge of bearing to the end of member < = 1.5h
    Interior loading or reaction - the distance from the edge of bearing to the end of member > 1.5h

  Web Cripping of C-Section Web with Holes C3.4.2

    Hole reduction factor, Rc
      1)   For end-one flange reaction,   Rc = 1.01 - 0.325 dh/h + 0.083 x/h < = 1.0, N>= 1.0 in.
      2)   For interior-one flange reaction   Rc = 0.9 - 0.047 dh/h + 0.053 x/h < = 1.0, N>= 3 in.

    The limits for the above equation:

      dh/h < = 0.7
      h/t < = 200
      Holes centered at the mid-depth of web
      Clear distance between holes > = 18 in.
      Distance between end of member and edge of hole >= d
      Non-circular holes, corner radii > = 2t
      Non-circular holes, dh < = 2.5 in. and Lh < = 4.5 in.
      Circular holes, diameter < = 6 in.
       dh > = 9/16 in.

      dh - depth of hole
      h - depth of flat part of web
      t - thickness
      d - depth of section
      Lh - length of hole
      x- nearest distance between web hole and edge of bearing
      N - bearing length

  Combined Bending and Web Cripping C3.5

    ASD
    1). shapes having single unreinforced webs:
       (M / Mn) + 0.91 (P / Pn) < = 1.33 / O

    2). For shapes having multiple unreinforced webs (two C sections):
       (M / Mn) + 0.88 (P / Pn) < = 1.46 / O

      M - required allowable flexural strength
      P - required allowable strength for web cripping
      Mn - Nominal flexural strength
      Pn - Nominal strength for web cripping

       O = 1.7

    LRFD
    1). shapes having single unreinforced webs:
       (Mu / Mn) + 0.91 (Pu / Pn) < = 1.33 f

    2). For shapes having multiple unreinforced webs (two C sections):
       (Mu / Mn) + 0.88 (Pu / Pn) < = 1.46 f

      Mu - required flexural strength
      Pu - required strength for web cripping
      Mn - Nominal flexural strength
      Pn - Nominal strength for web cripping

      f = 0.9

Web Crippling Under Point Loading or Reaction