Steel structures miscellaneous

Steel structures miscellaneous

Easy Questions

Steel Structures

Steel structures miscellaneous
  1. In a steel plate with bolted connections, the rupture of the net section is a mode of failure under








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    tension

    Correct Option: A

    tension

  1. A steel member ‘M’ has reversal of stress due to live loads, whereas another member ‘N’ has reversal of stress due to wind load. As per IS 800:2007, the maximum slenderness ratio permitted is:








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    As per IS 800: 2007
    m – λ – 180
    m – λ – 350
    ∴ M < N

    Correct Option: A

    As per IS 800: 2007
    m – λ – 180
    m – λ – 350
    ∴ M < N

  1. A streel portal frame has dimensions, plastic moment capacities and applied lads as shown in the figure. The vertical load is always twice of the horizontal load. The collapse load P required for the development of abbeam mechanism is








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    Internal work done,
    wi = Mp θ + 2 Mp. θ + 2 Mp θ + Mp θ
    = 6 Mp θ
    External work done,
    We = load × Δ
    = 2 Pδ
    = 2PLθ
    Wi = We
    6Mpθ = 2P Lθ

    ∴ P =
    3mp
    L

    Correct Option: A


    Internal work done,
    wi = Mp θ + 2 Mp. θ + 2 Mp θ + Mp θ
    = 6 Mp θ
    External work done,
    We = load × Δ
    = 2 Pδ
    = 2PLθ
    Wi = We
    6Mpθ = 2P Lθ

    ∴ P =
    3mp
    L

  1. A truss, as shown in the figure, is carrying 180 kN load at node L2. The force in the diagonal member M2U4 will be








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    Taking moment about L
    VL6 × 24 = 180 × 2 × 4
    ∴ VL6 = 60 kN
    VL0 = 120 kN
    Force in member M2 L4 is zero.
    Take section along u3 u4 – L3 L4

    Σ v = 0
    FU4M2 cos θ = 60

    ∴ FU4M2 =
    60
    cos θ

    =
    60 × 5
    		= 100 kN
    3

    The force is tension (pulling)

    Correct Option: A

    Taking moment about L
    VL6 × 24 = 180 × 2 × 4
    ∴ VL6 = 60 kN
    VL0 = 120 kN
    Force in member M2 L4 is zero.
    Take section along u3 u4 – L3 L4

    Σ v = 0
    FU4M2 cos θ = 60

    ∴ FU4M2 =
    60
    cos θ

    =
    60 × 5
    		= 100 kN
    3

    The force is tension (pulling)

  1. In the design of lacing system for a built-up steel column, the maximum allowable slenderness ratio of a lacing bar is








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    Maximum allowed slenderness ratio of lacing bars is 145.

    Correct Option: B

    Maximum allowed slenderness ratio of lacing bars is 145.