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Re: single plate shear connections edge distance
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- Subject: Re: single plate shear connections edge distance
- From: Eric Ober <eric(--nospam--at)cagley.com>
- Date: Fri, 03 Nov 2000 15:34:23 -0500
I have a copy of the Astaneh paper and his recommendations are that "horizontal and vertical edge distances of the bolt holes are recommended to be at least 1.5 times diameter of the bolt." He describes the edge distance below the lowest bolt as "preferred" to be 1.5", but not required. 1.5 times diameter for a 3/4" bolt is 1-1/8" which would seem to indicate 1-1/4" is OK. Am I missing some other piece of information?
Eric Ober
Charlie Carter wrote:
Such a modification will reduce the strength a little bit, but may have more of an impact on the available ductility in the connection. The parameteres on the shear tab you quoted are from the Astaneh procedure, which requires that ductile limit states (plate yielding, bolt bearing deformations) control over fracture limit states. The more you deviate from the prescribed geometric parameters, the more you deviate from the ductility level demonstrated in the tests. The further you get away, the closer you should be getting to assessing the strength of the connection with statics and strength of materials for the specific case you have, instead of trying to modify the Astaneh tabulations, which are based upon the prescribed parameters.Charlie-----Original Message-----Our detailers have a question that I was unsure of the answer: When doing single plate shear connections with 3/4" dia bolts (9th ed. p 4-54 or the Vol. II connections), would it be acceptable to use 1 1/4" vertical edge distances at the top and bottom of the plate instead of 1 1/2"? I am thinking that it would be reasonable to assume that the allowable load would multiplied by a ratio of the length of new plate over the length of plate in the tables since the proposed plate would be 1/2" shorter - conservatively assuming that the weld length controls. If block shear controlled, I guess this approach would also be close. Your thoughts are always appreciated.
From: Ken Peoples [mailto:lvtakp(--nospam--at)yahoo.com]
Sent: Wednesday, November 01, 2000 10:38 AM
To: seaint(--nospam--at)seaint.org
Subject: single plate shear connections edge distance
Kenneth S. Peoples, P. E. Lehigh Valley Technical Associates 2102 Main St. Suite 200 Northampton, PA 18067 ph: 610-262-6345 fax: 610-262-8188 email: lvta(--nospam--at)fast.net
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