Strongest Way To Connect Wood I Like To Separate My Metal Shed, Like To Know How To Separatet The Metal Piece?

I like to separate my metal shed, like to know how to separatet the metal piece? - strongest way to connect wood

I have an old metal shed, quiet, and wants a new model (wood + vinyl replacement), but the problem is that this metal is poured occur not only through the metal pins in touch, but somehow is using a certain type of metal bond so strong.
My question is: What kind of things you should buy in order to dissolve the metal band, and if it exists, what can I do to be reduced?
Thank you.