Structural mild steel plates utilized in steel tanks are assigned an allowable tensile stress of________________?
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Answer: B. 105.5 MPa on net area
Explanation
Structural mild steel plates in steel tanks are assigned an allowable tensile stress of 105.5 MPa evaluated on the net sectional area. Evaluating stress on the net area accounts for fastener holes that reduce the effective cross-section. This specific allowable stress limit ensures safety against tensile rupture in liquid-retaining steel structures. Steel tanks store liquids under hydrostatic pressure, creating tensile hoop stresses in plate walls. Allowable stress design methods limit material stresses to safe fractions of the steel's yield strength. Net sectional area calculations subtract fastener hole diameters from the total plate width.
Civil engineers design bolted and riveted steel water tanks using codified allowable stress parameters. Ensuring plates do not exceed 105.5 MPa in tension prevents structural distortion and catastrophic tank failure. Proper stress evaluation guarantees long-term structural reliability in municipal water storage facilities. Option A suggests 95.0 MPa, which is overly conservative for standard mild steel tank plates. Option C proposes 105.5 MPa evaluated on gross area, ignoring the strength reduction caused by fastener holes. Option D suggests 150.0 MPa on gross area, which is dangerously high and violates steel tank design codes.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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