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    Strength Check For The Scaffold Tube.: Design Condition

    Uploaded by

    Adura Ogunnu
    The scaffold tube was designed to support a working load of 420 kg from 3 workers (210 kg each) with a 100% safety factor. Strength checks were performed on the tube: 1) Bending stress from horizontal and vertical loads was below the design limit of 35.5 MPa. 2) Weld strength was calculated to support over 21 tons, far exceeding the actual load of 560 kg. 3) Each of the 6 casters was determined to safely support up to 320 kg each, above the 70 kg actual load per caster. Therefore, the scaffold tube design passed all strength checks for its intended working load.

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    Strength Check For The Scaffold Tube.: Design Condition

    Uploaded by

    Adura Ogunnu
    46 views3 pages
    The scaffold tube was designed to support a working load of 420 kg from 3 workers (210 kg each) with a 100% safety factor. Strength checks were performed on the tube: 1) Bending stress from horizontal and vertical loads was below the design limit of 35.5 MPa. 2) Weld strength was calculated to support over 21 tons, far exceeding the actual load of 560 kg. 3) Each of the 6 casters was determined to safely support up to 320 kg each, above the 70 kg actual load per caster. Therefore, the scaffold tube design passed all strength checks for its intended working load.

    Original Title

    Scaffold Tube

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    The scaffold tube was designed to support a working load of 420 kg from 3 workers (210 kg each) with a 100% safety factor. Strength checks were performed on the tube: 1) Bending stress from horizontal and vertical loads was below the design limit of 35.5 MPa. 2) Weld strength was calculated to support over 21 tons, far exceeding the actual load of 560 kg. 3) Each of the 6 casters was determined to safely support up to 320 kg each, above the 70 kg actual load per caster. Therefore, the scaffold tube design passed all strength checks for its intended working load.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    46 views3 pages

    Strength Check For The Scaffold Tube.: Design Condition

    Uploaded by

    Adura Ogunnu
    The scaffold tube was designed to support a working load of 420 kg from 3 workers (210 kg each) with a 100% safety factor. Strength checks were performed on the tube: 1) Bending stress from horizontal and vertical loads was below the design limit of 35.5 MPa. 2) Weld strength was calculated to support over 21 tons, far exceeding the actual load of 560 kg. 3) Each of the 6 casters was determined to safely support up to 320 kg each, above the 70 kg actual load per caster. Therefore, the scaffold tube design passed all strength checks for its intended working load.

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    © All Rights Reserved
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    Strength Check for the Scaffold Tube.

    Design Condition

    Design Standard is KSD 3566


    Bending Stress, σ = 35.5 x 106 Kg/m2
    Working Load = 3 workers x70Kg/workers + 100% = 420 Kg
    Load Capacity = 420 Kg/6.49 m2 = 65 Kg/m2
    Outside diameter of tube, do = 48.3 mm = 0.048 m
    Inside diameter of tube, di = 45.1 mm = 0.045 m

    1. Strength Check for the Working Platform (P/F)


    i) Tube Bending Strength Check (Hor.)

    From Equation,
    Moment, M = σ x Z
    Also,
    M = P x L2
    8
    Load applied, P = 65 x 6.49 m2 = 421.85Kg / 4 = 105 Kg

    Therefore, M = 105 x 2.72


    8
    M = 96 Kg.m

    Section Modulus, Z1 = π x (do4- di4)


    32 x do
    Z1 = π x (0.0484 – 0.0454)
    32 x 0.048
    Z1 = 2.46 x 10-6 m3 x 2 = 4.92 x 10-6 m3

    Section Modulus, Z2 = bh2 = 0 .048 x (0.03)2 = 7.2 x 10-6 m3


    6 6

    Therefore, Section Modulus, Z = Z1 + Z2 = 4.92 x 10-6 + 7.2 x 10-6 = 1.1212 x 10-5 m3


    So, from equation,
    M=σxZ

    σ = M = 96 = 79.20 x 105 Kg/m2


    Z 1.1212 x 10-5

    Calculated Bending Stress (7.92 x 106 Kg/m2) < Bending Stress (35.5 x 106 Kg/m2)

    Therefore, OK
    2) Tube Bend Strength Check (Vertical)

    From Equation,
    Moment, M = σ x Z

    Also,
    M = P x L2
    8
    Load applied, P = 420/4 = 105 Kg
    Therefore, M = 105 x 22
    8
    M = 52Kg.m

    Section Modulus, Z1 = π x (do4- di4)


    32 x do
    Z1 = π x (0.0484 – 0.0454)
    32 x 0.048
    Z1 = 2.46 x 10-6 m3 x 2 = 4.92 x 10-6 m3

    Section Modulus, Z2 = bh2 = 0 .048 x (0.03)2 = 7.2 x 10-6 m3


    6 6

    Therefore, Section Modulus, Z = Z1 + Z2 = 4.92 x 10-6 + 7.2 x 10-6 = 1.1212 x 10-5 m3


    So, from equation,
    M=σxZ

    σ = M = 5.2 = 4.63 x 106 Kg/m2


    -5
    Z 1.1212 x 10

    Calculated Bending Stress (4.63 x 106 Kg/m2) < Bending Stress (35.5 x 106 Kg/m2)

    Therefore, OK

    3) Tube Weld Strength Check

    From Equation,

    σ = P x FS
    A
    P=σxAx1
    FS
    = 35.5 x106 Kg/m2 x 0.15 x 0.004

    = 21300 Kg

    P = 21 Ton.

    Calculated Load, P = 21 Ton > Actual Load, P = 560 Kg.

    Therefore, OK
    4) Scaffold’s Caster Allowable Load Check

    Working Load = 3 workers x 70 Kg/worker + 100%


    = 420 Kg

    Therefore, 420 = 70 Kg
    6 casters

    Caster Allowable Load = 320 Kg > Actual Load = 70 Kg.

    Therefore, OK

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