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Title:

Simplified Live Load Distribution Factors for Glued-Laminated-Timber Bridges

Accession Number:

01125591

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

This manuscript presents simple relationships for calculating the live load distribution factor for glued-laminated- simple spans deck-on-girder timber bridges. Analytical models for four in-service timber bridges that were previously tested by others and several typical glued-laminated bridges were developed for the ANSYS finite element program. These models accounted for the orthotropic behavior of the timber, the connectivity between the deck panels and the as built bridge support conditions. In addition, the effects of the bridge span length, the spacing between the bridge girders, and the bridge width on the distribution of the live load among the bridge girders were investigated. The bridge models were subjected to one or multiple lane loads. These loads were positioned at different longitudinal and transverse locations on the bridge deck to induce the maximum moment and shear forces in the exterior and interior girders of a bridge. The live load distribution factors that were obtained from the analytical models were compared to those obtained using the AASHTO-LRFD live load distribution relations. The comparison showed that the live load distribution factor obtained using the AASHTO-LRFD were conservative when compared to those obtained using analytical models. For this reason, statistical methods were utilized to develop simple and accurate relationships that can utilized in calculating the live load distribution factors for the design of glued-laminated bridge girders. The results of the developed relations were compared to similar results that were obtained from the test of the in service bridges.

Monograph Accession #:

01120148

Report/Paper Numbers:

09-0896

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Fanous, Fouad

Pagination:

23p

Publication Date:

2009

Conference:

Transportation Research Board 88th Annual Meeting

Location: Washington DC, United States
Date: 2009-1-11 to 2009-1-15
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures (8) ; References (17) ; Tables (9)

Uncontrolled Terms:

Bridge spans; Glued laminated girders

Subject Areas:

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

Source Data:

Transportation Research Board Annual Meeting 2009 Paper #09-0896

Files:

TRIS, TRB

Created Date:

Jan 30 2009 5:08PM