InTrans / Aug 14, 2018

Field Performance of Timber Bridges: 2. Cooper Creek Stress-Laminated Deck Bridge

The Cooper Creek bridge was constructed in February 1992, in Centerville, Iowa. The bridge is a two-span, continuous stress-laminated deck structure 42-ft long and approximately 26.5-ft wide. The bridge is unique in that it is one of the first known stress-laminated timber bridge applications to use eastern cottonwood. The performance of the bridge was monitored continuously for 28 months beginning at the time of installation. Performance monitoring involved gathering and evaluating data relative to the moisture content of the wood deck, force level of the stressing bars, vertical creep, and behavior of the bridge under static-load conditions. In addition, comprehensive visual inspections were conducted to assess the overall condition of the structure. Based on field evaluations, the bridge is performing well with no structural or
serviceability deficiencies.