Why Not?

by Don Friedman on April 7, 2016

Our purpose in learning about old structural systems is to be able to analyze them so that they can be reused. In other words, we have nothing against new structure but see no reason that anything should be demolished just because it’s not understood.

When we have to add new material – for example, when infilling a hole in an existing floor – we typically recommend ordinary new structure. But if someone wants to match the old, why not? In the photo below, the dark gray stripes are the bottom flanges of wrought-iron beams supporting the brick-vault floor. The new, infill area of brick is obvious.

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