What is the maximum allowable deflection for roof rafters under design wind loads in Hawaii's hurricane zones?
Correct Answer
D) L/240
Hawaii Building Code specifies L/240 maximum deflection for structural members under design wind loads to ensure structural integrity.
Why This Is the Correct Answer
The Hawaii Building Code requires L/240 maximum deflection for roof rafters under design wind loads in hurricane zones. This stricter standard than typical L/360 live load deflection ensures structural members can withstand extreme wind forces while maintaining serviceability. The L/240 limit provides adequate stiffness to prevent excessive movement that could compromise roofing materials or structural connections during hurricane conditions.
Why the Other Options Are Wrong
Option A: L/360
L/360 is the standard deflection limit for live loads on floor systems and normal roof loads, but it's too restrictive for wind load deflection criteria. Hawaii's hurricane zones require the less restrictive L/240 limit specifically for design wind loads to account for the temporary nature of extreme wind events.
Option B: L/300
L/300 is not a standard deflection limit specified in building codes for structural members. This value falls between common deflection criteria but is not recognized in the Hawaii Building Code for roof rafters under design wind loads in hurricane zones.
Option C: L/180
L/180 is too lenient for structural deflection limits and would allow excessive movement that could compromise the integrity of roofing systems and connections. This deflection ratio is not specified in building codes for roof structural members under any load condition.
Memory Technique
Remember '240 Hurricane' - in Hawaii's hurricane zones, roof rafters must limit deflection to L/240 under design wind loads. Think '240 mph winds need 240 deflection limit.'
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