Field performance of timber bridges. 9, Big Erick`s stress-laminated deck bridge

J. A. Kainz; J. P. Wacker; M. Nelson

Field performance of timber bridges. 9, Big Erick`s stress-laminated deck bridge

Author(s): J. A. Kainz; J. P. Wacker; M. Nelson
Source: (Research paper FPL ; RP-552):24 p. : ill., maps ; 28 cm.
Publication Series: Research Paper (RP)
Station: Forest Products Laboratory
PDF: Download Publication (1.9 MB)

Description

The Big Erickas bridge was constructed during September 1992 in Baraga County, Michigan. The bridge is 72 ft long, 16 ft wide, and consists of three simple spans: two stress-laminated deck approach spans and a stress-laminated box center span. The bridge is unique in that it is one of the first known stress-laminated timber bridge applications to use Eastern Hemlock sawn lumber and a combination of stress-laminated decks and a stress-laminated box in a single bridge. Performance of the bridge was monitored for 35 months, beginning at the time of installation. Monitoring involved gathering and evaluating data relative to the moisture content of the wood components, the force level of stressing bars, and the 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 only minor serviceability deficiencies.

Publication Notes

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Citation

Kainz, J. A.; Wacker, J. P.; Nelson, M. Field performance of timber bridges. 9, Big Erick`s stress-laminated deck bridge. (Research paper FPL ; RP-552):24 p. : ill., maps ; 28 cm.

Keywords

Bridges, Structural timbers, Laminated wood, Stress analysis, Performance, Stress lamination