A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Seismic Retrofit of Two New York City Bridges
This paper reports on the seismic retrofit of two New York City Bridges, the Macombs Dam Bridge and the 145th Street Bridge. Both span over the Harlem River, a navigable waterway in New York City. Both bridges are owned, operated, and maintained by the New York City Department of Transportation (NYCDOT). The Macombs Dam Bridge, completed in 1905, consists of 78 spans of various types, including a 415m steel viaduct, a 126.5m main swing span, a 67m camelback truss, and other approaches and ramps., The 145th Street Bridge, completed in 1885, consists of a 94.5m main swing span, steel girder and truss approach viaducts, and earth filled approaches for a total length of 482m. A new superstructure has been designed by NYCDOT for the 145th Street Bridge. There were several unique challenges of this project. First, site-specific seismic hazard criteria only recently adopted by NYCDOT were applied to the bridges. The criteria were developed by an expert panel of six nationally reputable seismologists. This is the first time that a group of seismological experts was assembled to resolve the long-debated issue on seismic hazard levels in the Northeastern United States. Second, seismic performance of a movable bridge requires some unique considerations, including the behavior of machinery elements and their tolerance for misalignment during earthquakes, and the issue of the requirement for seismic design when the bridge is in the open position. Third, the substructures and foundations of the bridges are complex and in many cases there is a lack of detailed information. Fourth, the subsurface conditions at the site are highly variable, making site-specific response analysis important. A focus of this paper is the development of the seismic retrofit design based on the seismic deficiencies established through the performance evaluation. The retrofit schemes for the substructures and foundations will be discussed.
Seismic Retrofit of Two New York City Bridges
This paper reports on the seismic retrofit of two New York City Bridges, the Macombs Dam Bridge and the 145th Street Bridge. Both span over the Harlem River, a navigable waterway in New York City. Both bridges are owned, operated, and maintained by the New York City Department of Transportation (NYCDOT). The Macombs Dam Bridge, completed in 1905, consists of 78 spans of various types, including a 415m steel viaduct, a 126.5m main swing span, a 67m camelback truss, and other approaches and ramps., The 145th Street Bridge, completed in 1885, consists of a 94.5m main swing span, steel girder and truss approach viaducts, and earth filled approaches for a total length of 482m. A new superstructure has been designed by NYCDOT for the 145th Street Bridge. There were several unique challenges of this project. First, site-specific seismic hazard criteria only recently adopted by NYCDOT were applied to the bridges. The criteria were developed by an expert panel of six nationally reputable seismologists. This is the first time that a group of seismological experts was assembled to resolve the long-debated issue on seismic hazard levels in the Northeastern United States. Second, seismic performance of a movable bridge requires some unique considerations, including the behavior of machinery elements and their tolerance for misalignment during earthquakes, and the issue of the requirement for seismic design when the bridge is in the open position. Third, the substructures and foundations of the bridges are complex and in many cases there is a lack of detailed information. Fourth, the subsurface conditions at the site are highly variable, making site-specific response analysis important. A focus of this paper is the development of the seismic retrofit design based on the seismic deficiencies established through the performance evaluation. The retrofit schemes for the substructures and foundations will be discussed.
Seismic Retrofit of Two New York City Bridges
Abrahams, Michael J. (author)
Structures Congress 2001 ; 2001 ; Washington, D.C., United States
Structures 2001 ; 1-12
2001-05-18
Conference paper
Electronic Resource
English
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