Extending Bridge Service Life Through Field Welded Repairs and Retrofits (2016) / Chapter Skim
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Pages 28-39
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29 to focus on a single field welded project performed by each of the six agencies and highlights key field welded practices implemented in these projects. Four of the six case examples involved repair cracking and other damage resulting from a collision with a bridge girder.
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30 State Project Name Location/ Year Built Bridge Type Reason for Field Welding Estimated Number of Welds Success of Field Welding Connecticut Bridge No. 00299 I-395 Southbound over Route 14, Plainfield, CT 1958 3-span, steel, multigirder with cast-in-place deck Crack in bottom flange from collision damage 1 very satisfied Illinois Structure No.
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31 road below and a shoulder closure on the main road above. The entire repair was completed in one day.
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32 CASE EXAMPLE 2 -- ILLINOIS DEPARTMENT OF TRANSPORTATION Extent of Field Welding Bridge Type, Layout, and Location I-80 over the Mississippi River near La Claire, Iowa, is a 16-span, continuous steel, two-girder bridge, with 12 steel, multi-girder approach spans and a cast-in-place reinforced concrete deck. Total bridge length is 3,483 ft.
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33 ping the out-of-plane top flange movement. A bolted retrofit may have been possible at some but not all locations as a result of congestion of other surrounding details.
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34 CASE EXAMPLE 3 -- MAINE DEPARTMENT OF TRANSPORTATION Extent of Field Welding Bridge Type, Layout, and Location Bridge #5995 carries I-95 northbound over Hinckley Road in Clinton, Maine. This bridge is a three-span, steel, multi-girder, rolled beam bridge composite with a cast-in-place deck, consisting of six beam lines.
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35 Consideration of Cost, Timing, Access, Complexity, and Alternate Repair Details A bolted splice was considered; however, this type of repair would lower the vertical clearance by 2 in., which would increase the risk of this bridge getting hit again. The DOT likes to control the length of time that a repair is being performed to limit the impact to the public.
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36 CASE EXAMPLE 4 -- MASSACHUSETTS DEPARTMENT OF TRANSPORTATION Extent of Field Welding Bridge Type, Layout, and Location Charles M Braga Jr.
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37 Performance of Repairs and Retrofits Performance of Field Weld The DOT started the repair of stringer ends in 2010 and continued with repairs into 2011. The repairs are performing as expected and no issues have been noted.
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38 determined by noting the material specification from the design drawing that showed that it was weldable steel from 1969. Most of the bridge is ASTM A36 steel, with one section of ASTM A441 Grade 50 steel that previously had been welded.
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39 repair was simple because the cracked fillet weld only had to be gouged out and rewelded. This type of repair was costeffective because it did not require a bid package and was performed in-house.
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40 there were no follow-up problems with the field welded repairs and the repairs were reported to be cost-effective. • Connecticut DOT does a significant amount of field welding and endorses it as a repair method.
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