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  • Sample of Jib Crane Design Criteria:

    Project Jib Crane Column Design 1 of 3
    Number With cap channel and optional 8/7/04
    Description opposite flange cover plate

    0 deg
    Input: 90 deg
    Cap Channel C12X20.7
    Opp. flange cover Pl. width 6.00 in e_pin
    Opp. flange cover Pl. thk 0.00 in
    P 3.10 kips
    L_boom (Lb) 11.00 ft
    H_boom (Hb) 15.00 ft
    L_spread (Ls) 3.00 ft
    L_col (Lc) 22.563 ft
    Column stf spacing 8.750 ft
    Fy Channel 36 ksi Opposite
    Fy Column 55 ksi Flange
    Weld Fu 70 ksi
    d_col 12 in V1
    bf_col 8 in Lb M1
    tf_col 0.375 in Lc Ls V2
    tw_col 0.2 in P M2
    e_pin 3.5 in Hb V1
    CSR - fa/Fa+fbx/Fbx 0.580
    Results:
    Column forces - jib crane alone Stf spcg for .6Fy 3.11 ft
    L_high 7.563 ft Channel data OK
    L_low 12.000 ft Channel strong axis OK 0.720 CSR
    M 34.100 k-ft Opp Flange "e" mom. OK 0.941 CSR
    P_couple 11.367 k Boom 0 deg checks OK 0.187 CSR
    V1 1.511 k
    V2 9.855 k
    M1 11.430 k-ft
    M2 18.136 k-ft
    P 3.100 k Cap channel C12X20.7
    Area 6.090 in^2
    depth 12.000 in
    tw 0.282 in
    bf 2.942 in
    tf 0.501 in
    T 9.750 in
    k 1.125 in
    x_bar 0.698 in
    e_naut 0.870 in
    d/Af 8.130
    Ix 129.000 in^4
    Sx 21.500 in^3
    rx 4.610 in
    Iy 3.880 in^4
    Sy 1.730 in^3
    ry 0.799 in





    Project Jib Crane Column Design 2 of 3
    Number With cap channel and optional 8/7/04
    Description opposite flange cover plate

    Boom rotated 90 deg.

    Channel taking all bending
    fb 10.122 ksi
    Fb 14.057 ksi

    Opposite column flange resists eccentricity moment
    T tourque 29.894 k-in
    PT_couple 2.491 k
    VT1 0.331 k
    VT2 2.160 k
    MT1 2.505 k-ft
    MT2 3.975 k-ft
    Sf - flange+cover sect mod 4.000 in^3
    fb - flange+cover 11.924 ksi
    Fb - flange (F2-3) 33.000 ksi
    ratio 0.361
    CSR limit for plane analysis 0.639


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