PRESSURE-TREATED WOOD BRIDGES WIN CIVIL ENGINEERING ACHIVEMENT AWARD

This tri-level hood bridge system uses pressure-treated glu- laminated timbers and is designed to give an aesthetic look that would blend into the natural setting of a scenic area. The Keystone bridge is made up of 2 wood glu-laminated bridges: one arch bridge, and one timber girder bridge. It is designed so that each bridge carries 1-way traffic; however, each is constructed to be able to serve 2 lanes. The top arch bridge is 290 feet long and has a 26 foot mile roadway. The timber bridge is 170 feet in length and constructed with a horizontal curve radius of 381.97 feet. A construction problem which was successfully solved was the design of the longitudinal beams of the girder bridge spanning the roadway to give a reasonable depth for vertical clearance and provide the proper composite action between concrete slab and timber girders. Approximately 180,000 feet of glu-laminated material was used in addition to sawn timber for the fabrication of the component structurals. All timber used in the laminated beams was pressure treated (with pentachlorophenol bourne in a liquid gas medium which left the wood with a natural appearance) prior to fabrication.

• Corporate Authors:

  American Wood Preservers Institute

  1651 Old Meadow Road
  McLean, VA  United States  22101
• Publication Date: 1969-4

Media Info

• Features: Figures; Photos;
• Pagination: 11 p.

Subject/Index Terms

• TRT Terms: Arch bridges; Composite construction; Concrete; Girder bridges; Gluing; Laminated wood; Timber; Wood preservatives; Wooden bridges
• Old TRIS Terms: Timber (Structural)
• Subject Areas: Bridges and other structures; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00153014
• Record Type: Publication
• Report/Paper Numbers: Report No. HD:0.25
• Files: TRIS
• Created Date: Jul 19 1977 12:00AM