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CELE Past Board Exam Problem

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SITUATION: Hoisting beam ABC is clamped at B and is anchored by a 22-mm bolt at A, where the bolt is embedded to the concrete as shown in figure MECH-002. Given the following:
W = 12 kN; a = 1.0 m; b = 2.5 m; c = 1.5 m
Contact between the clamp and the concrete at B = 200 x 150 mm
Allowable bolt stress = 69 MPa
Allowable bond stress between the concrete and the bolt = 21 MPa
1. Calculate the required dimension “d”, in mm, using a factor of safety of 1.50.
A. 28 C. 35
B. 31 D. 40

2. Calculate the bearing stress (MPa) of the concrete at B.
A. 1.40 C. 2.20
B. 1.80 D. 2.34

3. If the clamp at B have 20-mm diameter bolt in double shear, calculate the bolt shear stress (MPa).
A. 133.69 C. 47.75
B. 66.85 D. 33.42


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