STEEL BEAMS STRENGTHENED WITH ULTRA HIGH MODULUS CFRP LAMINATES

Advanced composites have become one of the most popular methods of repairing and/or strengthening civil infrastructure in the past couple of decades. While the use of Fiber Reinforced Polymer laminates and sheets for the repair and strengthening of reinforced concrete structures is well established,...

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Main Author: Peiris, Nisal Abheetha
Format: Others
Published: UKnowledge 2011
Subjects:
Online Access:http://uknowledge.uky.edu/gradschool_diss/204
http://uknowledge.uky.edu/cgi/viewcontent.cgi?article=1207&context=gradschool_diss
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spelling ndltd-uky.edu-oai-uknowledge.uky.edu-gradschool_diss-12072015-04-11T05:01:03Z STEEL BEAMS STRENGTHENED WITH ULTRA HIGH MODULUS CFRP LAMINATES Peiris, Nisal Abheetha Advanced composites have become one of the most popular methods of repairing and/or strengthening civil infrastructure in the past couple of decades. While the use of Fiber Reinforced Polymer laminates and sheets for the repair and strengthening of reinforced concrete structures is well established, research on the application of FRP composites to steel structures has been limited. The use of FRP material for the repair and rehabilitation of steel members has numerous benefits over the traditional methods of bolting or welding of steel plates. Carbon FRPs (CFRPs) have been preferred over other FRP material for strengthening of steel structures since CFRPs tend to posses higher stiffness. The emergence of high modulus CFRP plates, with an elastic modulus higher than that of steel, enables researchers to achieve substantial load transfer in steel beams before the steel yields. This research investigates both analytically and experimentally, the bond characteristics between ultra high modulus CFRP strengthened steel members and the flexural behavior of these members. A series of double strap joint tests with two different CFRP strip widths are carried out to evaluate the development length of the bond. Both ultra high modulus and normal modulus CFRP laminates are used to compare strengthened member performance. Steel plates reinforced with CFRP laminates on both sides are loaded in tension to evaluate the load transfer characteristics. Debonding under flexural loads is also studied for ultra high modulus CFRP strengthened steel girders. Flexural tests are carried out under 4-point bending on several small scale wide flange beams. This study also introduces the novel ultra high modulus CFRP plate strip panels for strengthening of steel bridge girders. The first field application of ultra high modulus CFRP laminates in strengthening steel bridge girders in the United States is also carried out as part of the research. Full scale load tests carried out before and after the strengthening are utilized to measure the degree of strengthening achieved and checked against the expected results. A finite element model is developed and calibrated using data obtained from the field testing of the bridge. The model is then used to evaluate the behavior of the bridge under different conditions before and after the strengthening process. 2011-01-01T08:00:00Z text application/pdf http://uknowledge.uky.edu/gradschool_diss/204 http://uknowledge.uky.edu/cgi/viewcontent.cgi?article=1207&context=gradschool_diss University of Kentucky Doctoral Dissertations UKnowledge Carbon Fiber Plates Adhesive Steel Beams Bond Behavior Bridge Strengthening Civil Engineering Engineering
collection NDLTD
format Others
sources NDLTD
topic Carbon Fiber Plates
Adhesive
Steel Beams
Bond Behavior
Bridge Strengthening
Civil Engineering
Engineering
spellingShingle Carbon Fiber Plates
Adhesive
Steel Beams
Bond Behavior
Bridge Strengthening
Civil Engineering
Engineering
Peiris, Nisal Abheetha
STEEL BEAMS STRENGTHENED WITH ULTRA HIGH MODULUS CFRP LAMINATES
description Advanced composites have become one of the most popular methods of repairing and/or strengthening civil infrastructure in the past couple of decades. While the use of Fiber Reinforced Polymer laminates and sheets for the repair and strengthening of reinforced concrete structures is well established, research on the application of FRP composites to steel structures has been limited. The use of FRP material for the repair and rehabilitation of steel members has numerous benefits over the traditional methods of bolting or welding of steel plates. Carbon FRPs (CFRPs) have been preferred over other FRP material for strengthening of steel structures since CFRPs tend to posses higher stiffness. The emergence of high modulus CFRP plates, with an elastic modulus higher than that of steel, enables researchers to achieve substantial load transfer in steel beams before the steel yields. This research investigates both analytically and experimentally, the bond characteristics between ultra high modulus CFRP strengthened steel members and the flexural behavior of these members. A series of double strap joint tests with two different CFRP strip widths are carried out to evaluate the development length of the bond. Both ultra high modulus and normal modulus CFRP laminates are used to compare strengthened member performance. Steel plates reinforced with CFRP laminates on both sides are loaded in tension to evaluate the load transfer characteristics. Debonding under flexural loads is also studied for ultra high modulus CFRP strengthened steel girders. Flexural tests are carried out under 4-point bending on several small scale wide flange beams. This study also introduces the novel ultra high modulus CFRP plate strip panels for strengthening of steel bridge girders. The first field application of ultra high modulus CFRP laminates in strengthening steel bridge girders in the United States is also carried out as part of the research. Full scale load tests carried out before and after the strengthening are utilized to measure the degree of strengthening achieved and checked against the expected results. A finite element model is developed and calibrated using data obtained from the field testing of the bridge. The model is then used to evaluate the behavior of the bridge under different conditions before and after the strengthening process.
author Peiris, Nisal Abheetha
author_facet Peiris, Nisal Abheetha
author_sort Peiris, Nisal Abheetha
title STEEL BEAMS STRENGTHENED WITH ULTRA HIGH MODULUS CFRP LAMINATES
title_short STEEL BEAMS STRENGTHENED WITH ULTRA HIGH MODULUS CFRP LAMINATES
title_full STEEL BEAMS STRENGTHENED WITH ULTRA HIGH MODULUS CFRP LAMINATES
title_fullStr STEEL BEAMS STRENGTHENED WITH ULTRA HIGH MODULUS CFRP LAMINATES
title_full_unstemmed STEEL BEAMS STRENGTHENED WITH ULTRA HIGH MODULUS CFRP LAMINATES
title_sort steel beams strengthened with ultra high modulus cfrp laminates
publisher UKnowledge
publishDate 2011
url http://uknowledge.uky.edu/gradschool_diss/204
http://uknowledge.uky.edu/cgi/viewcontent.cgi?article=1207&context=gradschool_diss
work_keys_str_mv AT peirisnisalabheetha steelbeamsstrengthenedwithultrahighmoduluscfrplaminates
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