Web Crippling under Point Loading or Reaction

Shape ksi f_y= Beam d = in. R = t = L₀ = in. in. in. with Stiffeners ?

Result P_r = kips

Beam Supports End Support Interior Support

Stiffeners (Channel) b₁ = in. t₁ = d₁ = F_ys = in. in. ksi in. R₁ = c₁ = in.

Loading N = in. One Flange Loading or Reaction Two Flange Loading or Reaction

Beam Fastening to Supports Fastened UnFastened

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

    The limits for the above equation:

      d_h/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, d_h < = 2.5 in. and L_h < = 4.5 in.
      Circular holes, diameter < = 6 in.
       d_h > = 9/16 in.

      d_h - depth of hole
      h - depth of flat part of web
      t - thickness
      d - depth of section
      L_h - 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 / M_n) + 0.91 (P / P_n) < = 1.33 / O

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

      M - required allowable flexural strength
      P - required allowable strength for web cripping
      M_n - Nominal flexural strength
      P_n - Nominal strength for web cripping

       O = 1.7

    LRFD
    1). shapes having single unreinforced webs:
       (M_u / M_n) + 0.91 (P_u / P_n) < = 1.33 f

    2). For shapes having multiple unreinforced webs (two C sections):
       (M_u / M_n) + 0.88 (P_u / P_n) < = 1.46 f

      M_u - required flexural strength
      P_u - required strength for web cripping
      M_n - Nominal flexural strength
      P_n - Nominal strength for web cripping

      f = 0.9