According to Alabama building codes, what is the maximum allowable deflection for floor joists under live load?
Correct Answer
D) L/360
Alabama building codes limit floor joist deflection under live load to L/360, where L is the span length.
Why This Is the Correct Answer
Alabama building codes specify that floor joists under live load must not deflect more than L/360, where L represents the span length. This is the most restrictive standard among the options, ensuring minimal floor deflection for occupant comfort and structural integrity. The L/360 limit is commonly adopted in residential construction to prevent excessive bounce or sag in floors under normal use conditions.
Why the Other Options Are Wrong
Option A: L/180
L/180 allows twice the deflection of the correct answer, making floors too bouncy and potentially uncomfortable for occupants. This less restrictive standard would not meet Alabama's building code requirements for residential floor systems.
Option B: L/240
L/240 permits 1.5 times more deflection than Alabama's required standard. While this might be acceptable in some jurisdictions or for certain applications, it exceeds Alabama's maximum allowable deflection limit for floor joists under live load.
Option C: L/300
L/300 is more restrictive than required but still not the correct Alabama standard. While this would result in stiffer floors, Alabama specifically requires L/360 as the maximum allowable deflection limit for floor joists.
Memory Technique
Remember '360 degrees in Alabama' - the full circle represents the complete L/360 deflection limit for Alabama floor joists.
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