I was on a photoshoot today in Lewiston, and while waiting around (at the Starbucks down there) I looked up, and behold! Open web steel joists. Holding up a steel deck roof thing. Looks like 2 steel angles for the bottom (tension) zone of the beam, and two up above for the compression zone, with the zig-zag bars carrying the shear between. Sometimes the deck above, particularly with concrete poured over, is `studded' to the top of the beam - causing the concrete deck and steel to act as a composite. I suspect in this case the deck is simply attached to the joists to keep the deck from blowing away, and to provide lateral stability to the top (compression zone).
Note how `skinny' steel structure is compared to wood. My personal take is that wood is far more natural, and intuitive. Steel looks more `skeleton-ish'.
Also note the cross (X) brace. Steel happens to be so strong ... we end up with a lot of bracing and stability issues. You will rely heavily on your engineers when dealing with steel. "It's so strong it's unstable!"
... well, we are getting a bit ahead of the schedule - but I just can't resist a good shot.
Doc
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