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


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 | Case studies | Material failures | Failure analysis | Trusses | Truss bridges | Wood | Bridge failures

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