I was hired to perform a structural evaluation of the existing construction on a 6 building condo development. the development is a subgrade garage with concrete columns and PT slab above supporting up to two stories of wood framed construction. Originally it was only the distress report, but as my investigation revealed considerable construction defects, the owner then asked me to perform structural calculations on the existing structures to verify they were engineered correctly. Everything was OK, until I got to investigating the punching shear capacity of the PT slab at the columns. I hadn't noticed it before, but the concrete columns supporting the PT slab were only 12" square....with NO drop caps. As a result the punching shear force is about 35% higher than the punching shear capacity. Now my question, I need to attach a drop cap to the concrete column, but am unsure of the best way. With the connection force being around 70k on some columns, I don't think I can attach the retrofitted drop cap to the concrete column without a million bolts. I was thinking of fabricating bent plates that would sandwich around the concrete columns and then welding them together, thus providing a direct path to the foundation. I would like to hear if anyone else has any better/more cost effective ideas. I was looking into FRP, but couldn't find any examples of FRP and attaching drop caps on the internet.
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