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Gilbertl (Structural) (OP)
21 Aug 07 10:30
Does anyone know where the out-of-plane masonry wall deflection criteria are specified or discussed in the code, i.e. ACI 530 (any year), or IBC (any year)?

Any help will be greatly appreciated, thanks.
JAE (Structural)
21 Aug 07 10:51
IBC 2000 section 2108.9.4.6

Gilbertl (Structural) (OP)
21 Aug 07 13:06
Thanks, and although your response is correct for my question "any year", the IBC has ommitted that portion of the code in the subsequent editions; The masonry project I'm currently working on is governed by the 2006 IBC, which, like the 03 edition references to ACI 530, ASCE 5 and TMS 402. The only help I've found from these references is L/600 or 0.3" max., which as explained, I interpret as being applicable for the design of lintel or other structural members supporting masonry gravity loads.

Note F, from table 1604.3 minimizes offers some relief from the stringent L/600 criteria, but even L/420 (.7 x L/600) for out of plane deflections seems a bit excessive.

Thanks again, and I'm still reading up on the matter.
JAE (Structural)
21 Aug 07 13:41
If you find out something - do post it here in a follow up.

SteveGregory (Structural)
21 Aug 07 18:57
We always use L/600 for out of plane bending when we design steel stud backup for brick masonry. The same goes for deflection of building girts providing lateral support for the studs/masonry wall.

Building drift is another matter. For drift, you could use L/240 from IBC2003 Table 1604.3 for "Exterior walls and interior partitions:
With brittle finishes" and modify the wind loading by 0.7 per footnote F. However, we use L/360 with service loads (0.7 or 0.75) for drift.
DaveAtkins (Structural)
22 Aug 07 6:11
I use L/360, based on testing done at Clemson University in the 1980's.  Brick is very flexible out of plane.


NITTANYRAY (Structural)
6 Nov 07 19:50
BIA Technical Notes 28B revised.
"brick veneer/steel stud walls" states:
"The allowable out of plane deflection of studs should be restricted to L/600 using service loads."
This is to reduce cracking and water penetration.

Brick Industry Association is in Reston, Va.

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