Stability Problems of Wood Truss Bridge

by Oscar M. Hahn, (M.ASCE), Asst. Staff Engr.; Forest Service, USDA, Washington, DC,

Serial Information: Journal of the Structural Division, 1970, Vol. 96, Issue 2, Pg. 353-370

Document Type: Journal Paper

Discussion: Kyanka George H. (See full record)
Discussion: Feld Jacob (See full record)
Discussion: Carr James H. (See full record)
Discussion: Alsmeyer William C. (See full record)
Discussion: Byers William G. (See full record)
Closure: (See full record)


The case history of stability problems and failure for a spaced-member timber bridge truss is presented together with the cause of failure and the corrective measures. The cause of failure is identified as differential longitudinal movement between the two timbers of the spaced-member upper chord. Bolted joints permit differential longitudinal movement. This causes joint displacement and stability problems. The differential movement must be eliminated to achieve stable conditions. The new information on stress transfer gained from this experience applies to the general case of a wood truss with spaced-members.

Subject Headings: Wood bridges | Trusses | Structural failures | Truss bridges | Material failures | Failure analysis | Wood | Case studies | Joints | Bridge failures

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