Metal Building Slotted Secondary
Metal Building Slotted Secondary
(OP)
Does anyone know if metal building manufacturers are still putting slotted holes in purlins and girts without slip resistant bolting? I talked to an engineer at a metal building company a few years ago because I was analyzing the existing roof for new loads. The purlins had slotted holes connecting the purlins to the girders and I asked him how the purlins were able to act as struts to carry the load to the bracing with the slotted holes connecting the purlins to the frames. He was not able to answer my question, just that it was always done this way (he noted even the eave struts had slotted connections to the frames also). Also, how does this justify as bracing points for the frame members if it is not a slip critical bolting?
Any metal building engineers here?
Any metal building engineers here?






RE: Metal Building Slotted Secondary
Sounds a lot like the common dilema of providing a continuous chord tension tie at the roof diaphragm of a CMU/Tilt building, yet providing for longitudinal expansion/contraction in the walls.
Mike McCann
McCann Engineering
RE: Metal Building Slotted Secondary
RE: Metal Building Slotted Secondary
Make sense?
Mike McCann
McCann Engineering
RE: Metal Building Slotted Secondary
So you are saying that usually the metal building mfr. does specify the purlin/girt to frame bolting to be slip critical? That would make sense..
RE: Metal Building Slotted Secondary