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RE: Steel Moment Connections[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaoc(--nospam--at)seaoc.org'" <seaoc(--nospam--at)seaoc.org>
- Subject: RE: Steel Moment Connections
- From: hsprague(--nospam--at)aspen.klaalov.com (Harold Sprague)
- Date: Tue, 30 Jun 1998 10:21:25 -0600
Bill, You have raised an interesting point. Following the Hyatt walkway collapse, I inspected several shopping centers in Kansas City that had been in service for several years . On one, I found a connection supporting an escalator (vibration, high load, etc.) that had 14 - A307 3/4" bolts snug tight in unpainted steel. The connection was designed for and required A325 SC bolts. The interesting part came when the bolts were replaced. Only one of the bolts had slipped into bearing. Thirteen of the 14 bolts were removed by hand without the aid of a hammer. The point: Bill's caution is justified. Don't count on the bolts slipping with dead load only. Regards, Harold Sprague, PE Krawinkler, Luth & Assoc. -----Original Message----- From: Bill Sherman [SMTP:SHERMANWC(--nospam--at)cdm.com] Sent: Tuesday, June 30, 1998 8:26 AM To: seaoc(--nospam--at)seaoc.org Subject: Re: Steel Moment Connections I asked a similar question "in reverse" several weeks ago. I asked why AISC permits bearing type bolts in combination with welds in such connections, since slippage of the web connection bolts would cause additional stress in the flange welds. The response I got was that AISC assumes that the bolts will be in bearing due to dead load during erection and the examples shown are intended for non-high seismic conditions. Personally, I feel that slip-critical bolts should be used in such connections to prevent overloading the welds. It should be noted that the LRFD commentary suggests torquing the bolts before performing welding when using slip-critical bolts in combination with welds (see commentary for Section J1.7).
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