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Historic BridEe Condition Survev Report <br />] 1- I 74-0-AA45-10-002 <br />page 2. <br />Observations: <br />Roadway Approaches. Asphaltic approach pavement has minor cracks and is stightly uneven. <br />Substructure. The original steel support at the west end of the truss is severely rusted and has been <br />supplemented with additional steel piling installed under the originai steel cap. The originat steel support at the <br />east end of the truss has failed due to rust and has been replaced with new steel caps and pipe piling. The <br />original abutments faited and have been replaced with new steel caps and pipe piling. Steel pipe pi(ing were also <br />installed under 2 of the 5 intermediate truss floorbeams. The new steel supports and added bracing have <br />moderate rust overall with some heavily custed areas on piling near the water level_ <br />Superstructure-Floorbeams. Floorbeams have widespread paint failure and rust. Estimated section loss is a <br />maximum of 5%. <br />Superstracivre-Stringers. AlI original steel stringers have been replaced. New stringers have minor rust due <br />to lactc af paint. Bstimated sectian loss is 2%. <br />Superstructure-Bearings and Bracing. Truss bearings and fateral bracing members are in good condition <br />with minor rust due to paint failure. <br />Superstructure-Truss. T'he truss members have extensive paint failure and rust with overall section losses <br />estimated at 5°/a. Several vertical members are severely rusted at the lower connections (See photo). T'he <br />verticals are "no-force" members that only function to brace the top chord. Two vertical members were <br />incorrect(y installed resutting in slight bowing of the members due to misalignment at the top chord connection <br />(See photos). Some top chord stay plates and counection plates are severely rusted. Several short members were <br />added between the end post and bottom chord near the NE truss bearing apparently ta aid replacement of the east <br />truss support (See photo). Several truss members have minor damage from vehicular impact and from <br />mishandling during construction or repair work (See photos). None of the ohserved damage significantly affects <br />structural capacity of the truss. <br />ChanneL Significant widening and deepening of the channel since the original bridge was built was the primary <br />cause of original abutment failure. The new abutments and intermediate supports are not threatened by the <br />current channel condition. <br />Deck. Timber deck planks have moderate weathering and decay. A few planics are broken (See photo). Steel <br />raiting is rusty due to lack of paint and has minor damage ai several sections. <br />Conclusion• <br />Although the original truss is not functional in the existing bridge, it remains in fair condition with minor impact <br />damage, overall ►noderate rust, and a few severely rusted secondary components. The following iteras of work --_should be considered as part of a rehabilitation or preservarion praject. <br />• Remove added members between the end post and bottom chord near the NE truss bearing. <br />• Straighten or repair damaged truss members and rail sections. <br />• Switch position of the two improperty installed vertical members to correct their misaIignment. <br />• Repair severely rusted top chord stay plates and vertical member sections at bottom chord connections. <br />• Ciean and paint the bridge if feasible. Some connections need to be disassembled to remove pack rust. <br />• Install stringers consistent with the original design. <br />• Rehabilitate the timber deck using existing planks. <br />• Install the truss on new supparts at a suitable site. <br />1 ry <br />1 <br />