masonry anchorage to steel framing

huangyhg

masonry anchorage to steel framing
we have been talking about 3 common ways that we have used over the years to connect non-load bearing exterior cmu to steel framing. each has their own advantages and disadvantages.......
1) perimeter edge angle (at the diaphragm level) or pour stop bolted to the cmu. the bolt gets "locked in" once the concrete deck is poured. therefore, some live load will most likely get transfered to the wall. generally, good detail if cmu is installed before deck is poured. if deck is poured first, then shimming might need to happen between angle and wall to resist inward lateral loads.
advantage: direct lateral load transfer to diaphragm. lowest cost. perimeter angle serves two purposes
disadvantage: gravity ll transfered to non-load bearing wall.
2) angle, with vertical slots, field welded to bottom flange of spandral beam. intermittent diagonal brace (kicker) installed to limit lateral bending of beam bottom flange.
advantage: no gravity floor loading transfered to wall. easy access for installation. easy to use for any construction sequence.
disadvantage: indirect transfer to diaphragm. highest cost.
3) attachment of masonry anchorage to web of beam. preferably, anchorge needs to be toward top of beam to avoid the need for kickers.
advantage: simple.
disadvantage: steel must be installed before wall. distance between wall and web of beam may cause use of larger anchors to avoid buckling of anchorage under lateral load. a consideration of the flexibility of the anchor so that transfer of gravity to the wall is minimized.
which one does your office prefer and why?