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RE: Column Splice Locations[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Column Splice Locations
- From: Harold Sprague <harold.sprague(--nospam--at)neenan.com>
- Date: Fri, 29 Jan 1999 17:01:54 -0700
Greg, Sorry for the late reply, but this one took a little looking into. I don't know if you have received a response yet. Your interpretation is correct the lap splices are required to be in the middle third of the column. It appears that the 1997 UBC section 1918.104.22.168 is in error. I say that because it is different in the ACI 318-95 section 22.214.171.124 and the Draft 2000 IBC section 1908.1.27. Both of these documents require the lap splices in the middle third if the factored gravity axial forces exceed Ag f'c/10. The ACI and IBC have additional requirements that kick in when the forces exceed 0.35Po. But the laps have to still occur in the middle third. This additional requirement was a result of some performance issues observed in the Northridge earthquake. Regards, Harold Sprague, P.E. The Neenan Company harold.sprague(--nospam--at)neenan.com -----Original Message----- From: Gregory P. Luth [mailto:gluth(--nospam--at)klaa.com] Sent: Sunday, January 10, 1999 5:45 PM To: SEAOC (E-mail) Subject: Column Splice Locations Section 19126.96.36.199 of the 1997 UBC applies to columns that do not resist seismic loads, with axial load between 0.1 f'c and 0.3Po, in which the compatibility moments due to Rw*delta do not exceed the design moment. By reference to 1921.4.3, it appears that this section requires that the lap splices in such columns be located in the middle 1/3, a significant departure from previous codes. Is my interpretation correct? Can anyone explain why this provision is not triggered for axial loads less than 0.1f'c (19188.8.131.52) and for members with axial loads exceeding 0.3Po (19184.108.40.206)?
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