Design
Ammann, the master bridge builder and chief architect of the Port Authority, chose the steel arch design after rejecting a cantilever and suspension design as expensive and impractical for the site, given a requirement by the Port Authority that the bridge must be able to accommodate the future addition of rapid transit tracks.
The eventual design of the bridge called for a graceful arch that soars 266 feet (69 m) above the Kill Van Kull and supports a road bed for 1,675 feet (511 m) without intermediary piers. The total length of the bridge is 8,640 feet (2,633 m) with a mid-span clearance above the water of 150 feet (46 m). The arch resembles a parabola, but is made up of 40 linear segments.
The design of the steel arch is based on the Hell Gate Bridge designed by Ammann's mentor, Gustav Lindenthal. Gilbert had designed an ornamental granite sheathing over the steelwork as part of the original proposal, but as in the case of the George Washington Bridge, the stone sheathing was eliminated in order to lower the cost of the bridge, leaving the steel trusses exposed. It was the first bridge to employ the use of manganese steel for the main arch ribs and rivets.
Read more about this topic: Bayonne Bridge
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