Support Motion Effects in a Timber Trestle Bridge: Physical and Analytical Modeling

A representative one-tenth scale model of an open-deck three-span timber trestle bridge was constructed and subjected to load testing in the laboratory. The scaled timber trestle bridge incorporated a realistic wooden pile foundation in sandy soil. A computer-based analytical model was created with AxisVM software. The analytical model was used to predict the behavior of the physical model. The three-span complete timber trestle bridge model was constructed out of common dimension Douglas Fir. Each span was 1176 mm (48 in) long and utilized two semi-continuous bridge chords. Peeled pine poles were used in the pile foundation. This foundation type was used to create support motions similar to those observed in previous field testing. Wood crossties were also included in the physical specimen. Observed support motions of the physical specimen were similar to motions observed in field bridge tests. The AxisVM model was successful in predicting the behavior of the physical specimen. Typically, predicted deflections were within 5% to 10% of the measured values. The support motion created by the pile-soil interaction was also modeled successfully by using a linear spring approximation.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: 75p

Subject/Index Terms

Filing Info

  • Accession Number: 01038309
  • Record Type: Publication
  • Report/Paper Numbers: MPC Report No. 06-184
  • Files: TRIS
  • Created Date: Dec 14 2006 10:27PM