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CELE Past Board Exam Problem

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SITUATION: A column is built-up by welding four plates.
Given:
Plate dimensions, b x t = 400 mm x 16 mm
Unbraced column length:
About x-axis = 8 m
About y-axis = 4 m
Effective length factor = 1.0
Modulus of elasticity, E = 200 GPa
1. Which of the following gives the critical slenderness ratio for buckling about the x-axis?
A. 61.69 C. 47.55
B. 51.36 D. 32.77

2. Which of the following gives the critical slenderness ratio for buckling about the y-axis?
A. 39.21 C. 29.97
B. 25.24 D. 36.11

3. Which of the following gives the critical buckling load?
A. 22,300 C. 79,300
B. 82,500 D. 11,500



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