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A platform for research: civil engineering, architecture and urbanism
Load Testing for Bridge Rating: Route 32 Over Plattekill Creek
This report discusses instrumentation, and load testing and rating of Route 32 over Plattekill Creek (BIN 1022290) in Ulster County, New York. The bridge was built in 1915 as a simple span Jack Arch structure, consisting of steel beams and a concrete deck made of arches spanning between the beams. The bridge was widened in 1982 by adding additional beams to both sides of the structure. It is about 30-ft long, 28-ft wide, and has a 15-degree skew. The widening and the need to match the existing roadway geometry, resulted in a deck with an averages thickness of about eighteen inches, including a 3.5-in. thick asphalt overlay. Level 1 load rating analysis, based on assumptions for modeling composite action between the deck concrete and the bridge beams, was performed by the New York State Department of Transportation load rating engineers (Region 8). Based on this analysis and the Departments permit and posting policies, the bridge was R-posted or accessrestricted for certain types of permit loads. The motive for the testing was to investigate whether the load rating analysis assumptions were adequate and the bridge current R-posting could be lifted. The bridge structure was instrumented with strain gages and load tested using 4, 2-axle trucks of known weights and configurations. The testing revealed that the bridge members were much stronger in flexure than what was assumed in the Level 1 load rating analysis. The beams drew their additional strength, mainly, from acting compositely with the concrete deck (the top flanges and webs of the beams are fully encased in concrete) and the unintended restraint provided by the supports at the abutments. Additionally, the relatively thick deck is generally beneficial in improving load distribution and reducing the truck moments to individual beams. A test-based rating analysis was performed and recommendations for rating the structure at the inventory and operating levels, using the AASHTO working stress method and an H-20 rating truck, are made in the report.
Load Testing for Bridge Rating: Route 32 Over Plattekill Creek
This report discusses instrumentation, and load testing and rating of Route 32 over Plattekill Creek (BIN 1022290) in Ulster County, New York. The bridge was built in 1915 as a simple span Jack Arch structure, consisting of steel beams and a concrete deck made of arches spanning between the beams. The bridge was widened in 1982 by adding additional beams to both sides of the structure. It is about 30-ft long, 28-ft wide, and has a 15-degree skew. The widening and the need to match the existing roadway geometry, resulted in a deck with an averages thickness of about eighteen inches, including a 3.5-in. thick asphalt overlay. Level 1 load rating analysis, based on assumptions for modeling composite action between the deck concrete and the bridge beams, was performed by the New York State Department of Transportation load rating engineers (Region 8). Based on this analysis and the Departments permit and posting policies, the bridge was R-posted or accessrestricted for certain types of permit loads. The motive for the testing was to investigate whether the load rating analysis assumptions were adequate and the bridge current R-posting could be lifted. The bridge structure was instrumented with strain gages and load tested using 4, 2-axle trucks of known weights and configurations. The testing revealed that the bridge members were much stronger in flexure than what was assumed in the Level 1 load rating analysis. The beams drew their additional strength, mainly, from acting compositely with the concrete deck (the top flanges and webs of the beams are fully encased in concrete) and the unintended restraint provided by the supports at the abutments. Additionally, the relatively thick deck is generally beneficial in improving load distribution and reducing the truck moments to individual beams. A test-based rating analysis was performed and recommendations for rating the structure at the inventory and operating levels, using the AASHTO working stress method and an H-20 rating truck, are made in the report.
Load Testing for Bridge Rating: Route 32 Over Plattekill Creek
O. Hag-Elsafi (author) / J. Kunin (author)
2006
70 pages
Report
No indication
English
Diagnostic Load Testing for Bridge Load Rating
| British Library Conference Proceedings | 1997
Diagnostic Load Testing for Bridge Load Rating
| British Library Online Contents | 1997