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- To: wai(--nospam--at)euken.com
- Subject: Fwd: Bolted Connections
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 04 Aug 1997 15:42:35 GMT
Design Professionals in Steel Construction: According to AISC specifications, all torque verified bolts are to be checked with a torque wrench calibrated on a Skidmore-Wilhelm at least once for each shift of work. Our office has two such machines and we use them constantly, but the truth is that very seldom is this requirement met. The bolt is supposed to be tensioned in the Skidmore and the torque checked and established at that tension for that shift of work. In most cases, however, the bolt is torqued using a torque table and depending on the coefficient of friction this torque can easily overload or underload the bolt by as much as 40%. A bolt overtensioned by 40% is seriously damaged....a bolt undertensioned by 40% has significantly less value. The specifications call for the Skidmore, but perhaps you in the design world can give a hand by specifically stating that this specification be met and require bolt tensioning with a tensioning device (Skidmore) which is then used to establish torque settings for the actual tightness verification. I've spoken with Henry Huang of LA County regarding this issue. He is a very knowledgeable and concerned Engineer who is trying very hard to bring some serious issue to light regarding steel properties and mill certs we in the Inspection world are being forced to buy off on. Hey Henry, let's get some action going with the people on this list...over 2,000 strong and most of them, I believe, are Design Engineers. R. Sandy Pringle Sandy Pringle & Associates sandyp(--nospam--at)spasic.com STRUCTURAL INSPECTION CONSULTANTS http://www.beachnet.com/~sandyp/index.htm (800)598-1970 Fax(310)376-5294 Hermosa Beach & Redondo Beach, CA Be the master of your will and the slave of your conscience. --- Internet Message Header Follows --- Received: from server1.seaoc.org (bqe.com [18.104.22.168]) by host1.texramp.net (8.8.5/8.8.5) with SMTP id UAA08231 for <rlewis(--nospam--at)techteam.org>; Tue, 18 Mar 1997 20:47:18 -0600 (CST) Received: from corona.beachnet.com by server1.seaoc.org (NTList 3.02.10) id ca009856; Tue, 18 Mar 1997 18:35:56 -0800 Received: from localhost (pipe1-02.beachnet.com [22.214.171.124]) by corona.beachnet.com (post.office MTA v2.0 0813 ID# 0-29736U610) with SMTP id AAA69 for <seaoc(--nospam--at)seaoc.org>; Tue, 18 Mar 1997 18:29:38 -0700 Message-Id: <126.96.36.19970318182950.32273f4e(--nospam--at)mail.beachnet.com> X-Sender: seaoc-ad(--nospam--at)seaoc.org X-Mailer: Windows Eudora Pro Version 3.0 (16) To: seaoc(--nospam--at)seaoc.org From: "Sandy Pringle" <sandyp(--nospam--at)spasic.com> Subject: Bolted Connections Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Tue, 18 Mar 1997 18:29:38 -0700 Reply-To: seaoc(--nospam--at)seaoc.org Error-To: seaoc-ad(--nospam--at)seaoc.org X-Loop: seaoc(--nospam--at)seaoc.org X-Info: [SEAOC] Owner: seaoc-ad(--nospam--at)seaoc.org X-POP3-Rcpt: seaoc-ad(--nospam--at)seaoc.org Precedence: list X-ListMember: rlewis(--nospam--at)techteam.org [seaoc(--nospam--at)seaoc.org] __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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