Reply #69: Robertson Talks About The Interior Box Columns 30 Years After

[Christophera]

He does not say there were steel columns in the core, he says "columns of the services core". Box columns were steel on ringed the service core. Another way to term the structural core.

I'll add to his statement to show how the correct term works.

First, gravity-induced vertical deformations between the interior box columns of the services core and the columns of the outside wall were made equal at the top of the building; at other levels, the differential deformations were ameliorated. Second, wind-induced overturning moments were resisted in part by the interior box columns of the services core, thus providing additional lateral stiffness.