I'm doing a remodel on an existing structure. It has a 14" x 21" concrete beam spanning 18'. The building was built in the early 1950's. I know that was when working stress design (WSD) was being used. I don't have as built drawings, so I'm trying to figure out the minimum area of steel based on WSD from that era. Trying to see if I can add additional tributary area to the beam.
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