Mild steel beam web allowable shear stress diminishes in response to__________________?
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Answer: B. increase in h/t ratio
Explanation
The allowable shear stress in a mild steel beam web decreases as the depth-to-thickness ratio increases. Higher slenderness ratios make the web plate much more susceptible to elastic shear buckling. Code formulas reduce allowable stresses to maintain safety margins against premature web instability. Beam webs resist transverse shear forces through diagonal tension and compression stress fields. The depth-to-thickness ratio measures how slender and flexible the vertical web plate is. Thicker webs provide higher resistance to buckling without requiring auxiliary stiffener plates.
Structural engineers check web shear capacity during the design of rolled steel beams and plate girders. Understanding slenderness effects prevents buckling failures in deep structural steel members. Building codes provide reduction curves relating allowable shear stress directly to web slenderness. Decrease in h/t ratio increases allowable shear stress because thicker webs resist buckling better. Decrease in thickness contributes to a higher ratio which similarly reduces allowable shear capacity. Increase in height affects the slenderness ratio, but thickness is the other critical variable.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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