For 30° cranked or bent-up bar, the inclined length of the crank is given by:

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OSSC JE Civil Mains (Re-Exam) Official Paper: (Held On: 3rd Sept 2023)
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  1. 2 d
  2. 1.73 d
  3. 0.9 d
  4. 1.42 d

Answer (Detailed Solution Below)

Option 1 : 2 d
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Explanation:

Bars are bent near the support at an angle of 45°.

The angle of bend may also be 30° in shallow beams.

The purpose of bend near the support is firstly to resist the negative bending moment which occurs in the region of the support and secondly to resist the shear force which is greater at the support.

F2 N.M Madhu 27.02.20 D1

Inclined length of cranked bar is equal to:

\({\rm{L}} = \frac{{\rm{d}}}{{\sin 30}} = 2{\rm{d}}\)

Where,

d = overall depth of the beam/ member – top cover – bottom cover – bar diameter

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