[amp_mcq option1=”Decrease in h/t ratio” option2=”Increase in h/t ratio” option3=”Decrease in thickness” option4=”Increase in height” correct=”option1″]
The correct answer is: A. Decrease in h/t ratio.
The allowable shear stress in the web of mild steel beams decreases with a decrease in the h/t ratio. This is because the web is subjected to shear stresses, which are proportional to the h/t ratio. As the h/t ratio decreases, the shear stresses increase, and the allowable shear stress decreases.
The h/t ratio is the ratio of the height of the beam to the thickness of the web. The h/t ratio is a measure of the slenderness of the beam. A slender beam is a beam that is long and thin. A slender beam is more likely to buckle than a short, thick beam.
The allowable shear stress is the maximum shear stress that a beam can withstand without buckling. The allowable shear stress is a function of the h/t ratio. The allowable shear stress decreases as the h/t ratio increases.
The following are the explanations for each option:
- Option A: Decrease in h/t ratio. This is the correct answer. The allowable shear stress in the web of mild steel beams decreases with a decrease in the h/t ratio.
- Option B: Increase in h/t ratio. This is the incorrect answer. The allowable shear stress in the web of mild steel beams decreases with a decrease in the h/t ratio.
- Option C: Decrease in thickness. This is the incorrect answer. The allowable shear stress in the web of mild steel beams is not affected by the thickness of the web.
- Option D: Increase in height. This is the incorrect answer. The allowable shear stress in the web of mild steel beams is not affected by the height of the beam.