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
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
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).