For a gusseted base where the column end is machined to achieve complete bearing on the base plate, axial load transmission to the base plate is presumed to occur__________________?
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Answer: C. 50% by direct bearing and 50% through fastenings
Explanation
For a machined column end bearing fully on a base plate, the load transmission is shared equally as 50% direct bearing and 50% fastenings. Machining ensures intimate contact between the column shaft and the steel base plate surface. This equal load distribution accounts for potential minor micro-gaps while utilizing fastener capacity efficiently. Column base connections transfer heavy gravity loads from vertical members down into concrete foundations. Direct bearing occurs when steel rests physically against steel, while fastenings transfer load via welds or bolts. Design codes provide empirical load-sharing rules for machined column bases to ensure safe force transfer.
Heavy industrial columns and multi-story building columns utilize gusseted base plates with machined ends. Engineers design anchor bolts and connection welds based on these standardized load-sharing percentages. Proper base plate detailing prevents high local compressive stress concentrations on supporting concrete piers. Option A assumes 100% direct bearing, ignoring code requirements for fastening participation. Option B assumes 100% through fastenings, disregarding the structural contribution of machined bearing ends. Option D suggests 75% bearing and 25% fastenings, which contradicts standard equal-split design provisions.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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