The Morris Street Pedestrian Bridge - An Integral Bridge for Lower Manhattan
| Author(s): |
Rebecca Laberenne
Guy Nordenson |
|---|---|
| Medium: | conference paper |
| Language(s): | English |
| Conference: | Footbridge 2014 - Past, Present & Future, London, 16-18 July 2014 |
| Published in: | Footbridge 2014 - Past, Present & Future |
| Year: | 2014 |
| Abstract: | In 2006, the City of New York initiated an ambitious design-excellence program to replace 22 deteriorating pedestrian bridges in the five boroughs with new bridges designed by five teams of engineers and architects. Over seven years later, due to budget constraints and inter-agency politics, none of these bridges have been built, although several reached advanced stages of design before being put on hold. The design of one of the bridges, located in lower Manhattan at the entrance to the Brooklyn-Battery Tunnel, was resumed in 2012 and is currently in final design by Guy Nordenson and Associates and HNTB Corporation. The bridge is a 49m single span steel girder bridge with integral abutments. Although uncommon for pedestrian bridges, an integral abutment bridge was selected to facilitate erection and reduce traffic interruption at this constrained site in Manhattan and to reduce long-term maintenance requirements. The superstructure of the bridge consists of tapered steel girders inset from the deck fascia to maintain a narrow profile. The girders fork towards each support to stabilize the bridge torsionally and to widen the pedestrian path to provide generous access to both stairs and ADA-compliant (ie Americans with Disabilities Act) ramps which are aligned to the dominant traffic flow at the site. In addition to complex erection constraints, the design of the bridge considers other conditions which are unique to the site including post-Hurricane Sandy flooding and security concerns resulting from its close proximity to the entrance to a major traffic artery in the city. The design also creatively responds to the strict and occasionally irrational requirements of the New York City Department of Transportation, a major project stakeholder. |
| Keywords: |
pedestrian bridge micropiles steel girder site constraints integral abutment ADA compliant ramps
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data sheet - Reference-ID
10070927 - Published on:
09/12/2014 - Last updated on:
02/06/2021
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