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Re: Roof Design Components and Cladding or MWFRS - ASCE7-02

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The specifics of how to design for these two cases is not clear.

Seems, if the truss is designed to meet C&C loads, then there is no need to design it for MWFRS loading.  The only thing the roof would be doing in the MWFRS case would be transferring load to the shear walls, and such, to the ground.

It appears this is over design?  Or is this what is specifically meant?  This would be somewhat in conflict with the main definitions in the main code section, and the last quote in the ASCE7-02 commentary that I mentioned where it discusses long roof truss.
Refugio

On 1/31/06, David Topete <davetopete(--nospam--at)yahoo.com> wrote:
Refugio,

To quote from Alan Williams "Seismic and Wind Forces" design exmaples book, it says the following:
"... Components include purlins, studs, fasteners, and roof trusses.  Some elements, such as roof trusses and sheathing, may also form part of the main-force wind resisting system and must be designed for both conditions."
This book is based in IBC 2000, which references ASCE 7-98 by default.
HTH.

DT


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