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Earthquake design class DTS=3, bi-directional cassette(hollow-hole), building height is below 17m, I am going to solve a curtain project without gap around the elevator, but I was trying to solve all the projects according to high ductility, but the earthquake code 4.3.4.3 (page 33) article is limited or mixed. There is a substance such as solute, which I did not fully understand. I thought I could solve high ductility in all earthquake design classes. Can we help?