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canvas awnings tension on dowel supports

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How does one calculate the horizontal tension force for steel or fiberglass
rods supporting a horizontal canvas awning having 60 PSF snow load on it?
The canvas is to be wrapped around the rods each end.  The canvas is
"pretensioned" to make it taut when it is installed.  Thus the rods must
support the vertical and horizontal forces from the snow LL and the
pretension.  Help!

Tom Hammond

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