Design and Construction “CE Board Exam May 2005″
A simple beam 4.5 in span carries a concentrated load of 300 kN at its mid span and is subjected to an axial tensile force of 250kN. Fy = 248MPa.
Three sections are being considered as follows with their corresponding properties relevant to this problem.
| Section | Area | Beam
Depth |
Moment of
Inertia |
| W 42 x 55 | 0.01 m2 | 0.598 m | 0.000558 m4 |
| W 21 x 62 | 0.012 m2 | 0.533 m | 0.000554 m4 |
| W 21 x 68 | 0.013 m2 | 0.537 m | 0.000616 m4 |
1) Which of the following gives the lowest axial stress?
2) Which of the following gives the lowest bending stress?
3) Which of the following gives the safest section?
Solution:
