Banff Bridge
Short Span
Two options are being pursued demonstrating different relationships between the existing and new structure as it spans over the exposed estuary. The first scheme runs just to the north of the existing bridge, taking advantage of the landings’ higher ground to avoid the onerous flood/storm surge constraint. The geometry and span configuration relate to the existing bridge, reinterpreted as Y-piers supporting a simple slender structure that sits within the silhouette of the existing bridge.
Long Span
Of two options prepared, this second, more structurally ambitious proposal is located further north towards the open sea, where stable ground is confined to the edges of the estuary. In this location a larger, longer span configuration is required structurally and is visually more appropriate, given the ample offset from the existing bridge. A series of repeated triangular truss elements are hung from a pair of pylons to support the deck. At midspan the trusses flip below deck providing a greater feeling of openness and uninterrupted views at mid crossing.