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Re: Plywood use reply (Rigidity and Stiffness).[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: luis(--nospam--at)crosbygroup.com
- Subject: Re: Plywood use reply (Rigidity and Stiffness).
- From: Seaintonln(--nospam--at)aol.com
- Date: Tue, 20 Jul 1999 18:46:19 EDT
- Cc: seaint(--nospam--at)seaint.org
Normally, I would agree with you. In the case of the new code, I am not sure that that isn't what the code writters are suggesting. The goal appears to be to equalize the stiffness of all shear-resisting elements so as to minimize torsion in the diphragm. This means balancing shearwalls in adjacent grid lines so that they will deflect as close as possible to each other. The new code also requires the walls in a common line of shear to be designed by rigidity - implying that the stiffer wall may actually take all of the force at the onset of loading and then transfer shear once the stiffest element yeilds. This implies too that each wall in a grid line should be the same stiffness. Unless the walls have the same aspect ratio, the only way to get them to the save stiffness is to work with their sheathing, nailing (size and spacing) or increase the stiffness of the chords and holddowns. In the past, I would have said you are right, but am no so sure that this is in keeping with the intentions of the new code. Regards, Dennis In a message dated 7/20/99 3:29:12 PM Pacific Daylight Time, luis(--nospam--at)crosbygroup.com writes: << Dennis- I would not mix thickness or type of plywood. My two cents. J. Luis Ortega, P.E. The Crosby Group-Sacramento,CA (916) 563-7600 >>
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