Info

Plan

(a) Four storey, heavy construction

1.05 x 0.63 m column

Plan

(a) Four storey, heavy construction

Plan

(b) Eight storey, same weight as for (a)

1.12 x 0.67 m column

Plan

(b) Eight storey, same weight as for (a)

▲ 6.13 Ground floor plans of a four and eight-storey building of the same weight (gravity structure not shown. Drawn to scale).

like beams, trusses and columns.4 Unfortunately, similar information for the sizing of seismic structure is unavailable. The reason is simple -there are just too many variables that significantly affect structural dimensions. Yet architects do have some options for approximating member sizes before getting a structural engineer deeply involved. We now consider the primary factors that affect the amount of seismic structure that buildings require. In each case reported upon, below the structure is assumed to be fully ductile and therefore possesses the smallest possible footprint.

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