Cantilever Abutments


The span of the arch may be reduced and the depth and thickness may be made smaller if the support of the arch is placed at the end of a beam cantilever from the wall of the building. This design provides space under the cantilevers for seating by using area that would otherwise be required for the arch ribs.

The design of this structure requires a balance between the height of the arch and the span so the thrust line will be located in the optimum position.

This structure is most suitable for a large monumental auditorium structure rather than a building where economy is the principle consideration. The large volume of concrete and reinforcing steel in the abutment would not be required of the abutment could follow the thrust line.