InTrans / Aug 14, 2018

Field performance of timber bridges: 11. Spearfish Creek stress-laminated box-beam bridge

The Spearfish Creek bridge was constructed in 1992 in Spearfish, South Dakota. It is a single-span, stresslaminated,
box-beam superstructure. Performance of the bridge is being monitored for 5 years, beginning at installation. This report summarizes results for the first 3-1/2 years of monitoring and includes information on the design, construction, and field evaluations of the wood moisture content, force level in the stressing bars, behavior under static loading, and overall structure condition. Based on field evaluations, the bridge is performing satisfactorily with no structural or serviceability deficiencies. However, two bridge restressings were performed due to excessive bar force loss.