obstruction
would a continuous snow guard (a couple of inches high) on a 45 degree metal roof qualify as an "obstruction" per asce 7-02? an unobstructed surface is one in which no object prevents sliding.
sounds like it is an obstruction. agree or disagree?
according to fig.22-24 of ti 809-52 "commentary on snow loads" by corp of engineers, 2-3 inch snow guards are adequate.
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发表于 2009-9-10 16:51:41
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