A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Infrared system field testing on Poplar Street Bridge
The FHWA Dual Band Infrared system was very successful in finding delaminations in the polymer concrete overlay on the Poplar Street Bridge in St. Louis. An explanation of the FHWA system and infrared measurement techniques used on this unique project is presented. The multi-span steel box girder bridge has an orthotropic steel plate deck; the deck acts as the top flange of the box girders and is also the riding surface. This makes for a very light structure but also makes maintenance of the riding surface with an AADT of 100,000 very difficult. A nominal 1/2 inch overlay was placed on top of its 5/8 inch steel plate deck in 1992. At each end, elevations with expansion joints were matched by wedging 1/2 inch layers up to a 1 1/2 inch thickness. It was hoped that because of the low modulus of the Transpo T-48 overlay that the thick wedge would not cause any brittle failures in the material over several cold winters. Another concern was stresses caused by the welds of the longitudinal stiffeners and the transverse floorbeam connections to the bottom of the deck plate might cause excessive cracking of the overlay in these areas. In 1999 patches totaling less than 4% of the deck area were done. The patches still remained in good shape but Missouri and Illinois were looking at a 2007 project to replace the entire overlay. In August 2003 the infrared system was very successful in determining how much patching would be needed to last until the new overlay.
Infrared system field testing on Poplar Street Bridge
The FHWA Dual Band Infrared system was very successful in finding delaminations in the polymer concrete overlay on the Poplar Street Bridge in St. Louis. An explanation of the FHWA system and infrared measurement techniques used on this unique project is presented. The multi-span steel box girder bridge has an orthotropic steel plate deck; the deck acts as the top flange of the box girders and is also the riding surface. This makes for a very light structure but also makes maintenance of the riding surface with an AADT of 100,000 very difficult. A nominal 1/2 inch overlay was placed on top of its 5/8 inch steel plate deck in 1992. At each end, elevations with expansion joints were matched by wedging 1/2 inch layers up to a 1 1/2 inch thickness. It was hoped that because of the low modulus of the Transpo T-48 overlay that the thick wedge would not cause any brittle failures in the material over several cold winters. Another concern was stresses caused by the welds of the longitudinal stiffeners and the transverse floorbeam connections to the bottom of the deck plate might cause excessive cracking of the overlay in these areas. In 1999 patches totaling less than 4% of the deck area were done. The patches still remained in good shape but Missouri and Illinois were looking at a 2007 project to replace the entire overlay. In August 2003 the infrared system was very successful in determining how much patching would be needed to last until the new overlay.
Infrared system field testing on Poplar Street Bridge
Infrarotsystem zum praktischen Einsatz an der Poplar Street Bridge
Wenzlick, J.D. (author) / Fuchs, P.A. (author)
2006
8 Seiten, 4 Bilder, 2 Quellen
Conference paper
Storage medium
English
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