InTrans / Aug 14, 2018

Field performance of timber bridges: 18. Byron stress-laminated truss bridge

The Byron bridge was constructed in the fall of 1993 in Byron, Maine. The bridge is a single-span, two-lane, stresslaminated
truss structure approximately 46 ft long and 32 ft wide. The truss laminations were produced using chromatedcopper-arsenate- (CCA-) treated Southern Pine connected with metal plate connectors. This report includes information on the design, construction, and field performance of the bridge. Field performance was monitored for approximately 5 years, beginning shortly after bridge construction. Performance monitoring involved collecting and evaluating data relative to wood moisture content, force level of stressing bars, behavior under static truck loading, and overall structural condition. The field evaluations showed that the Byron bridge is performing well, with no structural or serviceability deficiencies.