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Masonry Wall Accidental Eccentricity

Masonry Wall Accidental Eccentricity

Masonry Wall Accidental Eccentricity

(OP)
Curious what you guys use for this. The BCRSMS 2011 addresses this for columns as 0.1 times the column dimension but no mention is made for walls.

I have seen wall h/450 (h = wall height). So for an 8in wall 9ft high its h/450 = 0.24in vs 0.1*t = 0.7625in

I'm probably going to use the h/450 because along a length of wall the probability that the eccentricity is one way or the other 0.1*t along the entire length of wall is a lot smaller than the probability of the accidental eccentricity for a column. In reality I'd guess that for the most part the accidental eccentricity evens out if taking the average accidental eccentricity for the wall since it can go to either side, so h/450 seems reasonable.

What I'm curious is what YOU guys use typically and your reasons. Thanks :)

RE: Masonry Wall Accidental Eccentricity

I still use 0.1t. I've got a reference to that somewhere but it would be a CSA reference

RE: Masonry Wall Accidental Eccentricity

CSA S304.1 clause 10.7.2. But it can be ignored if there are other lateral forces acting on the wall that cause higher moments.

RE: Masonry Wall Accidental Eccentricity

(OP)
Thanks. Yeah this wall got blown out from a fire line water leak causing 9ft of water to build up very quickly. Blew out the interior masonry bearing wall between two condominium units in the basement.

9ft of water's moment is a helluva lot higher than using either of these eccentricities but I was curious what everyone else uses for their eccentricity for my spreadsheet. My boss wants the wall reinforced but jeez reinforcing for 9 feet of water is insane.

Thanks again.

RE: Masonry Wall Accidental Eccentricity

Haha, No kidding, 9 ft of water on a block wall does sound like a great idea. You'd be better off pouring concrete walls.

RE: Masonry Wall Accidental Eccentricity

Looks like you can use masonry for swimming pools, now... <G>

Dik

RE: Masonry Wall Accidental Eccentricity

(OP)
It's not intended to always hold water, it was just a thought to reinforce "just in case" the 60psi fire line blows again, though I don't see that happening again. And yeah we opted not to design it for those loads because they reinforcing is ridiculous.

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