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Title: BRIDGE 9 ON SMITHS BRIDGE ROAD: WILMINGTON, DELAWARE
Accession Number: 00977186
Record Type: Component
Availability: N/AFind a library where document is available Abstract: Bridge 9 (Smiths Bridge) is a one-lane wide, three-span steel beam bridge with timber deck and railing with a superstructure dating from 1962 when it was rebuilt following a fire. The original superstructure was a single-span timber covered bridge constructed in 1839. The substructure consists of stone abutments dating back to the original 1839 bridge and stone faced concrete piers that were constructed in the 1950s when steel beams were added for support. The substructure is considered to be a contributing element to the historic district in which the bridge lies. The latest condition evaluation reports that the bridge deck is in poor condition, with the superstructure and substructure in fair condition. Based on the condition of the bridge, the scope of work was determined to include replacement of the superstructure and rehabilitation of the substructure. The context-sensitive design features include the following: giving consideration to aesthetics, historic issues, environmental concerns, noise concerns, multimodalism, traffic calming, safety, vandalism, and flooding; developing a replacement for the superstructure that is not a literal recreation of the historic structure, but is based on design qualities found in as-built drawings from 1956; building a one-lane covered bridge by getting a design exception to AASHTO design guidelines, determining an appropriate speed limit (20 mph), and realigning on the north side to provide better sight distances; and improving sight line distances by realigning and raising the approach from the west side of the bridge and by lowering the bridge deck by 1 ft.
Supplemental Notes: This paper appears in Transportation Research E-Circular E-C067, Context-Sensitive Design Around the Country: Some Examples. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
Report/Paper Numbers: E-C067
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Oldham, S GWeber, CPagination: p. 45-49
Publication Date: 2004-7
Serial: Features: Photos
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TRT Terms:
Aesthetics; Alignment; Bridge design; Bridge substructures; Bridge superstructures; Context sensitive design; Covered bridges; Environmental impacts; Floods; Historic bridges; Historic preservation; Multimodal transportation; Reconstruction; Rehabilitation; Sight distance; Traffic calming; Traffic safety; Vandalism
Geographic Terms: Subject Areas: Bridges and other structures; Design; Environment; Highways; History; Hydraulics and Hydrology; I24: Design of Bridges and Retaining Walls
Files: TRIS, TRB
Created Date: Aug 20 2004 12:00AM
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