Allowable defelction for Spandrel Beam bracing masonry
Allowable defelction for Spandrel Beam bracing masonry
(OP)
Does anyone know a reference stating what the allowable deflection is for a spandrel beam bracing the top of a masonry wall?
Application is for a metal building. The owner wants a 13'-4" high masonry wall. I told them the metal building must brace the wall.
Application is for a metal building. The owner wants a 13'-4" high masonry wall. I told them the metal building must brace the wall.






RE: Allowable defelction for Spandrel Beam bracing masonry
I would probably use L/600. That is what we would typically use for metal stud back-up for brick. While the deflection is for the vertical spanning studs/brick, I imagine it would be similar to the horizontally spanning spandrel.
I am interested to hear from others.
RE: Allowable defelction for Spandrel Beam bracing masonry
Be careful though of any rigid supports above or below that may induce rotation in the wall.
RE: Allowable defelction for Spandrel Beam bracing masonry
RE: Allowable defelction for Spandrel Beam bracing masonry
Mike McCann
MMC Engineering
RE: Allowable defelction for Spandrel Beam bracing masonry
IMHO, if the top of the masonry wall is supported by the girt, it is the movement of the building frame (@ the girt elevation) PLUS the girt deflection that must be limited to H/600.
If the girt deflects a 1/2" but the metal building frames are deflecting 1" (at an elevation of 13'-4"), the deflection that a piece of masonry located 1/2 way between building columns would experience is 1 1/2".
In reality, it is often difficult to get the MB supplier to limit the deflection of his building frame to accomadate masonry. For 8' or 10' high walls in similiar situations we look at just cantilevering the masonry off of the footing becasue this problem. At a masonry height of 13'-4", this is getting a bit difficult.
RE: Allowable defelction for Spandrel Beam bracing masonry
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Deflections up to L/240 did not have a negative long term impact on the veneer or structure.
RE: Allowable defelction for Spandrel Beam bracing masonry
RE: Allowable defelction for Spandrel Beam bracing masonry
RE: Allowable defelction for Spandrel Beam bracing masonry