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hatched roof shear capacity

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发表于 2009-9-16 13:30:32 | 显示全部楼层 |阅读模式
thatched roof shear capacity?
i have a project in hawaii in which a african thatched roof will be used.  it uses compressed berg or mountain grass that is about 10-12" thick.  it is tied to 2" dia. purlins that are 10" on center and the purlins are supported every 3.5'.  i need the roof to have an allowable shear capacity of 200plf.  if i calculate the shear capacity ignoring the thatch i can only get about 40plf. the thatching is pretty solid and stiff.  i know it must contribute to the strength and stiffness of the roof assembly.
i have been unsuccessful in finding any shear testing information although i know thatch roof construction is very common in some parts of europe.
anybody have experience with thatched roofing?
thanks.
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