Wall Bracing
Wall Bracing
(OP)
Folks,
See attached sketch. I am reviewing a set of calculations by a delegated engineer for bracing a wall for out-of-plane wind loads.
The connection consists of an angle with the outstanding leg cut and the other leg bent to anchor back to the structure. The connection is only designed for shear due to the horizontal component of the bracing force.
I think the connection should be designed for a combination of shear and moment (as shown in sketch).
Am I out of line?
See attached sketch. I am reviewing a set of calculations by a delegated engineer for bracing a wall for out-of-plane wind loads.
The connection consists of an angle with the outstanding leg cut and the other leg bent to anchor back to the structure. The connection is only designed for shear due to the horizontal component of the bracing force.
I think the connection should be designed for a combination of shear and moment (as shown in sketch).
Am I out of line?






RE: Wall Bracing
RE: Wall Bracing
RE: Wall Bracing
RE: Wall Bracing
RE: Wall Bracing
I would be less worried about the extra moment in the angle due to bending, and more about the apparent use of expansion bolts at the concrete beam.
Two concerns with that - spalling of the concrete and hitting the bottom steel of the beam. You can alleviate the first with chemical anchors, and the second with testing, or a better design.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Wall Bracing
I am only concerned about the detail attaching to the beam because of the forces that have not been accounted for.
I can suggest a alternate detail, but prior to doing it I have to let the engineer know why his detail does not work. Otherwise it will end up being a pissing contest.
RE: Wall Bracing
Good point, it is going into a tensile zone in the beam. Epoxied detail would be better (but I guess they are trying to avoid overhead epoxy work)
RE: Wall Bracing
RE: Wall Bracing
Be careful with long term creep effects which could transfer load to the wall. It seems like there is some room between the outside face of the beam and the inside face of the beam. Could the connection be moved to there instead so that you have a horizontal kicker instead which could be vertically slotted to allow deflection?
RE: Wall Bracing
RE: Wall Bracing
Garth Dreger PE
AZ Phoenix area
RE: Wall Bracing
I understand why a model would show a moment in both tension and compression. I am saying that in reality I do not see that moment happening. The clipped angle is effectively a plate and will just bend unless it is a thick angle and the bolts are shallow. If anything I would call it prying.
Is there any reason the brace can not be installed horizontal to eliminate this concern?
RE: Wall Bracing
There is a small eccentricity at the other end too. A double angle with gusset plate projecting down from the beam would be a better connection.
BA