Concrete without steel in it is just not resistant to shaking. I lived in Istanbul as a child in the 50s and I remember every time there was a little shock that might move my bed at night an inch or make me skip a step, a couple of apartment buildings would collapse. I saw one of them after such a joltlet. It was just a pile of rubble. I remember my dad looking at the debris and saying,”No steel, what were they thinking?”
A: $$$