Which type of column base is typically used for very large axial loads or when moment resistance is required?
- ASlab base
- BGusseted baseCorrect
- CHinged base
- DPinned base
Solution
Concept
Column bases for heavy structural loads
Formula
NONE
Step-by-step solution
1. Column bases distribute axial loads and moments from columns to concrete foundations. Answer: B
Explanation
A gusseted base utilizes vertical gusset plates and angles to efficiently distribute heavy column loads over a larger foundation area and resist applied bending moments. Simple slab bases are adequate only for moderate axial loads without significant moments. Therefore, option B correctly identifies the base type suited for heavy loads and moment transfer.
Why the other options are wrong
A) Slab bases are typically used for light to medium axial loads without significant moment transfer. D) Pinned bases do not provide moment resistance at the column support.
Shortcut
Gusseted base handles very large axial loads and provides moment resistance.
Common mistake
Selecting option A by assuming a standard slab base is sufficient for heavy axial loads and moment resistance.
Correct answer: B) Gusseted base