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Home| Questions|Q 64647
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rahul10
rahul10Beginner
Asked: March 21, 20222022-03-21T20:36:21+05:30 2022-03-21T20:36:21+05:30In: Steel Structures

Design a suitable base and anchor bolts for a column subjected to an axial load 500 kN and a wind moment of 175 kNm.

Design a suitable base and anchor bolts for a column subjected to an axial load of 500 kN and a wind moment of 175 kNm. The column section is I.S.H.B. 450 @ 907.4 N/m. Design also welded connection between column and the base. The safe bearing pressure of concrete may be assumed to be 4000 kN/m2

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    1. Priyanka Kashyap
      2022-08-31T20:15:44+05:30Added an answer on August 31, 2022 at 8:15 pm

      Given data:

      Axial load = 500KN = 500000N

      Wind moment = 175 KNm

      Assuming, grade of concrete = M20 i.e., fck = 20N/mm²

      Bearing strength of concrete = 0.45 × fck = 0.45 × 20 = 9N/mm²

      bearing strength, a reduced value of 0.45fck is used against maximum of 0.60fck ; as recommended by the IS code 

      Now, area of slab, A = factored load / bearing strength of concrete

      = (0.15 × 500000) / 9 = 8333.34 mm² = 8334 mm²

      Square base plate is provided; therefore

      Sides of the base plate = L = B = √A = √8334 = 91.29 mm = 92 mm

      Thickness of the base plate = t = √{[ 2.5 w ( a² – 0.3 b² ) Â¥m] / fy}

      Where, w = intensity of pressure = Load / area provided

      a = bigger projection of base plate beyond column

      b = smaller projection of base plate beyond column

      In this case , a = b because we are assuming, base plate and column both are square in shape.

      For holding down , anchor bolts are used.

      According to standards, when axial compressive load is on action then only two bolts will be enough for holding .

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