huangyhg

hairpin detail for metal building
does anyone have a hairpin detail to resist the lateral thrust from a metal building frame that gets installed correctly?
we are designing for new york state, so the piers and foundation walls are poured seperately from the slab on grade. we've done a few different iterations, including one we developed with a contractor's suggestions, but they never seem to get installed correctly.
thanks for your thoughts.
mark

yes; on a small building we will usually use hairpins, most often with turn down slab foundations. larger buildings will require cross building tie rods. i can send you autocad details. i don't know why you are placing your walls and piers seperatly?
the piers are poured integrally with the walls. the slab is poured at a later time. if we have hairpins sticking out of the piers, the contractor has a difficult time with backfill around the piers/walls before pouring the slab.
what do you use for cross building tie rods?
mark
some guys use pairs of lengths of welded re-bar to tie one pier to another across the building; some guys use a pair of threaded rods. you may have to thicken the slab to allow for the rods. talk to your metal building rep about rccomended details also. i'm not sure how to send information to
markmm,
what you describe is the way it is done, as far as i know. i suppose the hairpins do get in the way a little bit, but i don't see that as a big problem.
daveatkins
for cross ties, i use a concrete beam cast below the slab, similar to a grade beam but for the cross ties only. the beam is cast when the grade beams/footings are poured. the slab is placed later. i have not welded the cross tie bars together but use mechanical couplers when splices are needed.

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