Suggestions for lowering the period..

[aozhan90]

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What are your suggestions about the file in the link? I set the period to 1.06 levels, I cannot move the elevator curtains up in the basement in the x direction, due to the 1/15,1/7 rule, I cannot add columns in the x direction, I made the middle columns large in the x direction, what else can I do, your suggestions?