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While the design of private bridges is dictated by building codes, bridges on public property are designed by criteria set forth by AASHTO standards. Peterson Structural Engineers possesses a thorough knowledge of both sets of code criteria for bridge design. Typical gravity loadings by vehicles, pedestrians, horses, ATVs or other special uses are determined. Site topography is obtained and design is often coordinated with the investigation of subsurface conditions. When designing a waterway crossing, an evaluation of hydraulic conditions is often necessary.
PSE assists in obtaining the necessary design information and translating it into an economical bridge especially suited to the needs of the owner. |
Featured Projects
Oregon Department of Forestry
Trail Bridges
2005
Client: Oregon Department of Forestry (ODF)
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The Oregon Department of Forestry, an agency of the State of Oregon, sought to develop a set of standard bridge designs that would meet the requirements for the various trails on the state forest lands. The overall goal of this project was for ODF to obtain standard trail bridge designs to be used by hikers, horses and ATVs for a wide variety of trail conditions. PSE was contracted by ODF to provide bridge designs and engineering drawings to meet these conditions. These included bridges with spans up to 50 feet long and widths of 4 to 6 feet. |
PSE provided designs for bridge stringers made of sawn lumber, glulam, native logs and steel. Decks can be of wood or steel and handrails of wood, round poles or steel. In addition, three options for end abutments were provided. These documents allow ODF staff to select and to construct bridges that are uniquely suited to site conditions which are often difficult and remote. |
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Lower Vaughn Creek Tillamook Bridges
2005
Client: Tillamook Bay Watershed Council
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PSE was engaged to design two bridges to span the Lower Vaughn Creek in Tillamook. The 30-foot bridges were to be constructed utilizing the steel sections and the existing bridge configuration on the site. The projected use of the bridge was for traversing the creek with farm equipment and the occasional passage of cattle across the creek. |
A site visit was performed to analyze the existing conditions and inspect the proposed building materials. PSE provided the design of new structural elements as required for the existing bridge section, design of the new bridge section utilizing the available steel beams and new bridge decking materials, and the design of concrete spread footings for both bridge installations. |
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