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Title:

Laboratory Evaluation of Design Details for Minimizing Differential Panel Deflection on Glued-Laminated Timber Bridges

Accession Number:

01024574

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Much of the initial focus concerning the suitability of timber bridges has been on the structural aspects of design. Recently however, research has also been directed toward serviceability issues in timber design. The basis for the current serviceability criteria for timber bridge design has not been well determined or understood, and there have been concerns regarding the performance of asphalt wearing surfaces on glued laminated (glulam) timber bridges. Previous research at Iowa State University in cooperation with the United States Department of Agriculture Forest Service Forest Products Laboratory (FPL) identified that differential panel deflections were a significant factor affecting the deterioration of asphalt wearing surfaces on timber bridges. Consequently, the focus of this work was the investigation of methods to reduce differential panel deflections on timber bridges to improve asphalt wearing surface performance. Laboratory tests were completed on full scale glulam timber deck panels utilizing various methods to reduce differential panel deflections. Retrofit materials such as plywood, steel plate, dowel bars and others were used at the deck panel interfaces in an attempt to reduce differential panel deflections. The results from the testing indicated not only a reduction in differential panel deflection of 50 percent or more for some of these joint details, but that the resulting deflections were within the recommended limits provided in the current design specification. Recommendations include continuation of this work on in-service structures utilizing the recommended panel interface retrofit to investigate the durability of the retrofit and its effect on asphalt wearing surface performance.

Monograph Accession #:

01020180

Report/Paper Numbers:

06-2122

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Wipf, Terry J
Hosteng, Travis Kent
Ritter, Mike
Phares, Brent Matthew
Wood, Douglas L

Pagination:

21p

Publication Date:

2006

Conference:

Transportation Research Board 85th Annual Meeting

Location: Washington DC, United States
Date: 2006-1-22 to 2006-1-26
Sponsors: Transportation Research Board

Media Type:

CD-ROM

Features:

Figures (7) ; References (5) ; Tables (1)

Uncontrolled Terms:

Dowel bars

Subject Areas:

Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls

Source Data:

Transportation Research Board Annual Meeting 2006 Paper #06-2122

Files:

TRIS, TRB

Created Date:

Mar 3 2006 10:53AM