Steel structures miscellaneous

Steel structures miscellaneous

Easy Questions

Steel Structures

Steel structures miscellaneous
  1. A bracket connection is made with four bolts of 10 mm diameter and supports a load of 10 kN at an eccentricity of 100 m. The maximum force to be resisted by any bolt will be








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    Vertical load resisted/bolt = 10/4 = 2.5 kN
    Torsion, T = 10 × 100 = 1000 kNm.
    Radial distance of bolt = √302 + 402 = 50 mm

    ∴ Torsion shear =
    M × r
    Σ r2

    1000 × 50
    		= 5 kN
    (4 × 50)2

    θ = tan- 1
    30
    		= 36.9°
    40

    Resultant R = √2.52 + 52 + 2 × 2.5 × 5 × cos36.9°
    = 7.16 kN

    Correct Option: D

    Vertical load resisted/bolt = 10/4 = 2.5 kN
    Torsion, T = 10 × 100 = 1000 kNm.
    Radial distance of bolt = √302 + 402 = 50 mm

    ∴ Torsion shear =
    M × r
    Σ r2

    1000 × 50
    		= 5 kN
    (4 × 50)2

    θ = tan- 1
    30
    		= 36.9°
    40

    Resultant R = √2.52 + 52 + 2 × 2.5 × 5 × cos36.9°
    = 7.16 kN

  1. A steel flat of rectangular section of size 70 × 6 mm is connected to a gusset plate by three bolts each having a shear capacity of 15 kN in holes having diameter 11.5 mm. If the allowable tensile stress in the flat is 150 MPa, the maximum tension that can be applied to the flat is








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    Failure by flat in tiar = (70 – 2 × 11.5) × 6 × 150
    = 42.3 kN
    Max load transfered = 3 × 15 = 45 kN
    Max tension that can be applied minimum of two loads
    = 42.3 kN

    Correct Option: A

    Failure by flat in tiar = (70 – 2 × 11.5) × 6 × 150
    = 42.3 kN
    Max load transfered = 3 × 15 = 45 kN
    Max tension that can be applied minimum of two loads
    = 42.3 kN

  1. A steel column, pinned at both ends, has a buckling load of 200 kN. If the column is restrained against lateral movement at its mid-height, its buckling load will be








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    less = l/2

    Correct Option: D

    less = l/2

  1. A circular shaft shown in the figure is subjected to torsion T at two points A and B. The torsional rigidity of portions CA and BD is GJ1 and that of portion AB is GJ2. The rotations of shaft at point A and B are θ1 and θ2. The rotation θ1 is








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    Portion AB rotates without twisting

    T
    		=
    Cθ
    Jl

    ∴ θ =
    TJ
    C θ

    Angle of twist at A,
    θA =
    TL
    GJ

    Correct Option: B

    Portion AB rotates without twisting

    T
    		=
    Cθ
    Jl

    ∴ θ =
    TJ
    C θ

    Angle of twist at A,
    θA =
    TL
    GJ

  1. A fillet-welded joint of 6 mm size is shown in the figure. The welded surfaces meet at 60-90 degree and permissible stress in the fillet weld is 108 MPa. The safe load that can be transmitted by the joint is








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    Throat thickness = 0.707 × size
    = 0.707 × 6
    = 4.24 mm
    Total length of weld, l = 100 + 50 + 100 = 250 mm

    Strength or main load, P = l × t × τvf
    = 250 × 4.2 × 108 = 113.4 kN

    Correct Option: C

    Throat thickness = 0.707 × size
    = 0.707 × 6
    = 4.24 mm
    Total length of weld, l = 100 + 50 + 100 = 250 mm

    Strength or main load, P = l × t × τvf
    = 250 × 4.2 × 108 = 113.4 kN