Suspension Rail and Car Bridge

Project Types:

This bridge is 2090 metres long suspension bridge. The bridge is 105 years old and consists of 7 vehicular lanes and 4 subway tracks. STRAAM was contracted to perform a dynamic analysis of each suspension cable. Using our instrumentation STRAAM was able to identify each cables fundamental frequency within a matter of minutes. This was then used to calculate the amount of tension in each cable.

Client:

Weidlinger Associates

Location:

New York City, NY

Services Provided:

For this project STRAAM Group utilized a SENSR triaxle accelerometer and compatible software. This allowed for real time viewing of the PSD.

Value Added:

Our method utilized the normal traffic conditions on the bridge and did not require any additional lane closures. With each cable requiring about 1 minute of recording at 200 Hz, the field time was minimal. Measuring the fundamental frequency of each cable is one of the most efficient and cos t effective ways to tensioning in the cable.

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