Need a book? Engineering books recommendations...
[SEAOC] Gyp. board shear walls in LA[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)power.net
- Subject: [SEAOC] Gyp. board shear walls in LA
- From: Stephen & Karen Fisher <skfisher(--nospam--at)mother.com>
- Date: Mon, 17 Jun 1996 20:47:20 -0700
I have recently been working on a seismic evaluations of both 2 and 3 story wood framed apartment buildings in LA. I am curious as to the rational used in the drastic drop in the allowable shear value for gyp. board. According to research the allowable shear value of a 5/8" blocked gyp. board shear wall with 6d @4"o.c. has been modified in recent codes as follows: Prior to 1988 UBC: 175plf 1988 UBC thru current: 1/2 * 175plf = 87.5plf Current LA requirements: 30plf max I understand that gyp. board will tend to crack and can therefore not handle cyclic loading very well. Also, accoriding to some of the articles I have read if the nails are overdriven and break through the surface of the gyp. board there will be less capacity. My question is with the current 30plf allowable in LA. Is that the true capacity of the qyp. board? If so was the original 175plf a complete over estimate of the gyp. boards real capacity? If the 175plf was an overestimate then it was so by a factor of almost 6:1. Any thoughts you might have on this topic would be greatly appreciated. Stephen Fisher, PE ...
- Prev by Subject: Re: [SEAOC] Glazing support
- Next by Subject: [SEAOC] Gypsum Roof
- Previous by thread: [SEAOC] Re: [SEAOC] CAD Programs
- Next by thread: [SEAOC] RE: [SEAOC] Gyp. board shear walls in LA