huangyhg

cmu bond beam anchoring
i have a 16" deep bond beam at the top of an 8" cmu bearing wall (metal roof trusses). i need to anchor the vertical reinforcing (#5) into the bond beam. aci gives the developement length for a #5 as 24" (i only have the 16"). a hooked bar won't work due to constructability. i was thinking of welding the top bar in the bond beam to the vertical bar or using some sort of mechanical connection to a hook.
any suggestions for this situation.
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leave the main vertical reinforcing straight, for constructibility, then lap on hooked dowels.
usually you would hook the vertical bar used in the last lift. welding for masonry reinforcement is uncommon and would never get done right, plus typical crews don't have a certified welder, and you should use different bar material.
instead of a hook, hust use a 90 degree bend with a horizontal leg of 24" that would run parallel to the bb reinforcing. it isn't going to pull out.
if you are concerned though, use grade 40 rebar and weld the 24" legs to the horizontal bb reinforcing too.
mike mccann
mccann engineering

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