PREDESIGNED TIMBER BRIDGES OF THREE TYPES FOR ARKANSAS COUNTY ROADS. REPORT

According to the annual National Bridge Inventory, the highest percentage of US bridges that are "structurally deficient" or "functionally obsolete" is in the "city/county/township" category. In recent years the major causes of rapid deterioration of bridges with typical steel or concrete superstructures have been deicer chemicals and lack of adequate maintenance money. Well-designed "modern" timber bridges could be a cost-effective alternative for the replacement of substandard bridges on county and city roads. Three types of simple span timber bridges have been designed with accompanying specifications for ready use: (1) solid sawn stringers with transverse solid sawn deck planks, (2) glulam stringers with transverse glulam decks, and (3) stress-laminated full-span glulam stringers, all constructed of southern pine (SP). This report contains designs for the first type using 6 different SP stringer sections, for the second type using 4 different standard widths of SP glulam stringers, and for the third type using the same 4 separate widths of SP glulam stringers. Designs focused on flexural adequacy. Procedures are included for changing span length or depth of the primary bending sections to fit with any desired allowable deflection limitation or smaller "load duration factor".

• Record URL:
  https://ntlrepository.blob.core.windows.net/lib/9000/9500/9551/comb1057.html
• Supplemental Notes:
  • See the related report, Predesigned Timber Bridges of Three Types for Arkansas County Roads. Drawings. TRIS 00807041.
• Corporate Authors:

  Mack-Blackwell Transportation Center

  University of Arkansas, 4190 Bell Engineering Center
  Fayetteville, AR  United States  72701

  Department of Transportation

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Pleimann, L G
• Publication Date: 2000-6

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 111 p.

Subject/Index Terms

• TRT Terms: Bending; Bridge decks; Bridge design; Bridges; County roads; Deflection; Deterioration; Flexural strength; Glue; Laminated wood; Load factor; Prefabricated bridges; Stringers; Timber
• Geographic Terms: Arkansas
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00807040
• Record Type: Publication
• Report/Paper Numbers: MBTC FR-1057-1
• Files: NTL, TRIS, USDOT
• Created Date: Mar 18 2001 12:00AM