Some engineers put notes on the structural drawings saying, "Add 'U' bars same size and spacing as vertical bars". This would presumably apply to elements such as reinforced concrete balustrade/guard in parking structures. I cannot see the point of such U bars. Can anyone see what their function would be in an element such as a balustrade? I think they are undesirable because they are just more rebar to corrode (at least in a parking garage) where water collects on the top of the balustrade. Also if the width of the "U" bars is not precisely fabricated the side cover for corrosion protection may not be achieved.
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