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Re: Open Walled "Shed"[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Open Walled "Shed"
- From: "Greg Smith" <strusup(--nospam--at)gte.net>
- Date: Fri, 24 Sep 1999 12:16:25 -0500
At zero degrees the uplift may be zero,resulting in flutter, but as the angle (by even 1/10's of a degree) APROACHES zero the uplift graph is straight vertical and the magnitude is a function of the wind velocity so the lateral deflection of the supports IS a critical factor to design for. Greg -----Original Message----- From: Roger Turk <73527.1356(--nospam--at)compuserve.com> To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org> Date: Friday, September 24, 1999 11:49 AM Subject: Re: Open Walled "Shed" >Thor, > >Once again, I recommend referring to the report: "Wind Forces on >Structures," >published in ASCE Transactions, Vol. 126, Part II, 1961, page 1124. Table 4 >on page 1160-1161 covers open shed roofs, such as may be used at railroad >stations and includes the possibility of trains or stored material >obstructing the wind. Two roof slopes are considered; 10 deg and 30 deg. > >A. Roger Turk, P.E.(Structural) >Tucson, Arizona > >Thor Tandy wrote: > >>>A peer has sought my opinion on the lateral wind loads to a structure that >is essentially a non-walled structure. I.e. just a roof on a braced post and >beam assembly. > >My opinion was that he should use the the exterior vector coefficients in the >code for the roof using the internal pressure coefficients for a building that >would have large openings open during high winds. If the eave boards or beams >are deep enough they could also contribute? > >That analysis provides a resultant vector addition according to the roof slope >(here 15 degrees) which would I believe be the main resultant lateral load to >the roof structure (together with some serious uplift). > >He felt that the load calculated that way was too small, even using >corner/cladding coefficients. I suggested using an elevated billboard of same >projected dimensions as an upper limit, but that gave a much higher number, >too high to be reasonable for what is essentially an aerofoil on stilts. > >I think the simple vector addition of resultant roof pressures is sufficient. > >What does the group think?<< >
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