Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Assessment and maintenance of a 15 year old stress-laminated timber bridge

Source: Proceedings of the 7th International Conference on Short and Medium Span Bridges 2006, 2006 August 23-25, Montreal, Quebec, Canada. Montreal, Quebec, Canada : Canadian Society for Civil Engineering: pages RE-012-1--RE-012-10.

Author(s)Gentry, T. Russell; Brohammer, Karl N.; Wells, John; Wacker, James P.

Publication Year: 2006  View PDF »

Category: Journal Articles

Abstract: A timber bridge consisting of three 6.7 meter spans with a stress laminated deck was constructed in 1991 in the Spirit Creek State Forest near August, Georgia, USA. The stress laminated bridge uses a series of post-tensioning bars to hold the laminations together. The bridge remained in service until 2001 with no maintenance, at which time the bridge was inspected, load tested and the post-tensioning bars re-stressed. In 2005, the bridge was again inspected, load tested, and the bars were re-tensioned. This paper reports on results of the inspection and load tests. The overall condition of the bridge is reported, along with details on the moisture condition, overall deck deflection and timber strains under load. Details on the loss of post-tensioning forces in the bars, and an investigation of the causes of this loss, are presented.

Keywords: Laminated wood, bridges, floors, nondestructive testing, dead loads, testing, inspection, wooden bridges, moisture, glulam timbers, static loads, laminated bridges, stress-laminated bridges, timber bridges

File size: 463 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 24040
Current FPL Scientist associated with this product
Wacker, James P.
Research General Engineer
  

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »