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steep pitcheed roof diaphragms

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when a roof diaphragm has a steep pitch - say 45 degrees and greater - how 
effective is it as a diaphragm to transfer lateral forces along its length, 
perpendicular to the ridge?  due to the steepness of its pitch, would there 
be a tendency for the diaphragm to want to fold at the ridge?  does the ridge 
beam need to be designed as a girt that transfers the diagram load to gable 
frames?  are shearwalls effective at gable ends where the top plate slopes 
from 0 ft to several feet?

thanks in advance - paul franceschi

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