There's a project in my office that is in a low seismic area and is using conventional structural steel with composite slab on metal deck and ordinary braced frames. I was helping size base plates and bearing plates during some last minute detailing before the project went out the door and noticed all of the slabs on metal deck have #5 drag bars wherever there is a braced frame. Would someone be able to explain the reasoning for this? I am assuming the drag bars are being used to enhance the transfer of forces from the diaphragm (concrete on metal deck) to the braced frames but I have never learned about this method in school and would like to understand the reasoning behind it.
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