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Re: GLB v. Open Webbed Steel Joists[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: GLB v. Open Webbed Steel Joists
- From: cmh(--nospam--at)wallacesc.com (Chris Harris)
- Date: Wed, 15 Sep 1999 09:37:41 -0500
I have encountered two problems with permitting plans using open web steel joists in California. The first problem is with the submittal of the joists during the permitting process. Plan checkers will frequently require the joist manufacturer to sign and seal their erection drawings. Vulcraft does not object to signing and sealing their calculations, but refuse to sign and seal their erection drawings. The plan checker then expects me to sign and seal the manufacturer's erection drawings, which I refuse to do since the joists are not designed by me. Also, some plan reviewers have also required that the joist manufacturer submit elevations of each of their joists, identifying member sizes on each elevation as if it were a manufactured wood truss. This is unusual to me since the steel joists were preapproved and published in the 1994 UBC as acceptable (as long as SJI monitored the joist manufacturer). I have used steel joists elswhere in the country for years without this kind of resistance. Most of the plan reviewers act as if open web steel joists are some kind of new invention that they must regard with suspicion - a very unusual attitude since steel joists have been around for a very long time. I also get the same attitude with regard to the use of steel deck diaphragms. The second problem I have with steel joists and steel deck diaphragms is the issue of wall anchorage to concrete or masonry walls. LA requires wall anchorage details very similar to that required for wood roofs (i.e. sidewall subdiaphragms created with the use of steel angle struts perpendicular to the wall at 4' o.c.). Others believe that this is unnecessary. No testing has been done and I am not aware of any anectdotal evidence from past performance in earthqakes. It would be helpful if their was some consistent policy regarding wall anchorage when using steel joists and metal deck. Thanks, Christopher M. Harris, P.E.
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