Field Measurements of the Lusbaecken Timber Bridge. (Updated Version).

摘要

The report presents the results from a field-monitoring program to document the performance of the Lusbacken road timber-bridge at Borlange, in the province of Dalarna, Sweden. The Lusbacken bridge is a two-lane, stress-laminated, glulam box-beam superstructure. It has a single-span of 20 m and a clear width of 8 m. The bridge was prefabricated and delivered in four parts to the site where it was assembled. It was installed in August 1997. The monitoring started 9 months after installation, on May 19 1998, and is under execution. This evaluation includes the first 8 months, between May 19 1998 and January 27 1999. The monitoring involves data-acquisition of ambient temperature and relative humidity (RH), temperature and relative humidity in the glulam flanges, force levels in the steel bars and support displacement. The result will be used to improve design and construction methods for future stress-laminated timber bridges.