Both superstructures are designed as steel truss construction with
orthotropic deck plate and have identical spans.
In practice, this leads to numerous weld repairs and rigorous inspection requirements that drive up the cost of
orthotropic deck fabrication.
Vejrum, "Analysis of an
orthotropic deck stiffened with a cement-based overlay," Journal of Bridge Engineering, vol.
The old structure was demolished to make way for a 213 metre-long
orthotropic deck bridge with four spans.
These concerns, along with the advanced age of the bridge, prompted DRPA's decision to replace the deck with a structure that was lightweight, entailed low initial construction costs, was less vulnerable to leakage and corrosion, and (unlike an
orthotropic deck) could be fabricated domestically.
As part of the project, Tom Riester, chief structural engineer, needed to replace the bridge's aluminum flooring system and aluminum
orthotropic deck, which were installed in 1933.
The superstructures of the bridges are to be manufactured as single-span steel trough bridges with two main longitudinal members and
orthotropic deck plate.
Engineers define an
orthotropic deck as one that consists of steel plates supported by ribs underneath, overlain by an integrated wearing (driving) surface.
has developed a new
orthotropic deck system that has great potential as a retrofit option for aging bridges.
The construction of the new HOV/Bus lane is part of the larger $235.7 million Verrazano-Narrows Bridge upper level deck replacement project, which is replacing the original 1960s-era roadway with a lighter-weight, longer-lasting steel
orthotropic deck. In addition to the new roadway, new sign structures will be added, finger joint systems at the anchorages and towers rehabilitated, and new drainage and LED roadway lighting installed.
On the award-winning Throgs Neck Bridge project for MTA Bridges and Tunnels, Parsons investigated and identified the causes of fatigue cracks on multiple components of the
orthotropic deck approach spans of the bridge, which carries I-295 over the East River in New York City.
Both superstructures consist of a 2-stegigen steel truss with
orthotropic deck. The total length of a total of 7 fields is 698.80 m (79,20 - 91.20 to 107.48 - 143.20 to 107.48 - 91.20 to 79.20 m).
