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- To: "Engineers (California) list server" <seaint(--nospam--at)seaint.org>
- Subject: Bolting issues
- From: Charlie Carter <carter(--nospam--at)aiscmail.com>
- Date: Thu, 21 Jan 1999 22:30:52 -0600
There has been a great deal of discussion on bolts lately. Some of the statements made were right on track. Unfortunately, a great many statements were, in my (humble) opinion, incorrect. For example, a few messages indicated concerns about over-pretensioning and subsequent failure in service (RCSC Specification states that pretension in excess of the minimum required pretension is not cause for rejection). A few others stated a preference for one installation method as being better than the others (RCSC Specification Commentary states that four pretensioning methods are recognized without preference and each will provide an acceptable result if applied properly, i.e., without short-cuts). I regret that I don't have the time to detail out the answers and/or technical justification to all the questions that have been asked in the bolt "thread". Ha! Pun intended! But you can all find the answers to these and a whole lot of other questions on your own in two documents: 1. The RCSC Specification for Structural Joints Using ASTM A325 or A490 Bolts (note: the 1994 LRFD version is the best one by far for technical information) 2. The Guide to Design Criteria for Bolted and Riveted Joints, 2nd Edition, by G.L. Kulak, J.W. Fisher and J.H.A. Struik. The first reference is THE recognized standard for design and construction with bolted joints using A325 or A490 bolts. It's the basis of the bolting provisions in the AISC Specification and AISC Seismic Provisions. It has a Commentary that explains the basis of the requirements contained in it. The second reference is the source document that translates data from the research and investigation level to the RCSC Specification level. In essence, it is the Commentary to the Commentary to the RCSC Specification. Hope this helps (and sorry for being a bit long-winded) Charlie
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