substructure

Fatigue cracks in steel or shear cracks in concrete may be present, or scour may have removed substructure support.

Workers continued scraping and drilling into the substructure of the monument as darkness began to fall.

It was pulled down in 1547, but the substructure was left standing, and some private houses were erected upon it.

The side facing the north rested upon a solid substructure of hard blocks of hewn stone washed by the waves.

It is indeed the foundation, the substructure of a plant, but not strictly the first thing that starts to grow.

Early in September the first brick of my new National Opera-house, prior to the commencement of the substructure, was laid.

The street at this point is (or was) obviously supported upon a masonry substructure, upon which the houses abut.