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Thread: Wood shear wall uplift load combinations

Started 1 month, 3 weeks ago by patamd
When we design hold downs for wood shear walls, we use the load combination (0.6-0.14SDS)D+0.7pE (seismic) and 0.6D+W (wind) to calculate the uplift. In an other word, the formula we use are T=(Mot-(0.64-0.14SDS)Mr)/L (seismic) and T=(Mot-0.6Mr)/L. We got many projects approved using these equations. In other people's spreadsheets, we found that they use safty factors instead of those ASCE ...
Site: Eng-Tips Forums  Eng-Tips Forums - site profile
Forum: Wood design and engineering  Wood design and engineering - forum profile
Total authors: 3 authors
Total thread posts: 4 posts
Thread activity: no new posts during last week
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Other posts in this thread:

swm25 replied 1 month, 3 weeks ago
I use the ASCE combinations like you use, I use the overstrength factor to factor up the load for drag connections with seismic loading.

msquared48 replied 1 month, 3 weeks ago
( Don't you also have to apply the overstrength factor to discontinuous shearwall holddowns that create a soft story condition? , )

patamd replied 1 month, 3 weeks ago
According to the ASCE, I think we need to apply the omega to discontinuous shearwall holddwons. Please tell me if I am wrong. I discuss this with some other PE's, most of them do not use overstrength factor to fator up the overturning momnent when designing shearwall holddwons. If the omega is applied to the holddwon design, the uplift seems too large to be pratical, especially for residential ...

 

Top contributing authors

Name
Posts
patamd
2
user's latest post:
Wood shear wall uplift load...
Published (2009-11-11 18:57:00)
According to the ASCE, I think we need to apply the omega to discontinuous shearwall holddwons. Please tell me if I am wrong. I discuss this with some other PE's, most of them do not use overstrength factor to fator up the overturning momnent when designing shearwall holddwons. If the omega is applied to the holddwon design, the uplift seems too large to be pratical, especially for residential houses. We did not fator it up in some...
swm25
1
user's latest post:
Wood shear wall uplift load...
Published (2009-11-09 22:07:00)
I use the ASCE combinations like you use, I use the overstrength factor to factor up the load for drag connections with seismic loading.
msquared48
1
user's latest post:
Wood shear wall uplift load...
Published (2009-11-11 15:32:00)
( Don't you also have to apply the overstrength factor to discontinuous shearwall holddowns that create a soft story condition? , )

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