FIELD MEASUREMENTS OF LARGE MODULAR EXPANSION JOINT

Modular expansion joints are sometimes used on bridges with large movement potential. Single-support-bar modular expansion joints with 1200 mm of movement capability were used at each end of the third Lake Washington Bridge between Seattle and Mercer Island on Interstate 90. Fatigue cracks were observed in these joints within the first few years of service, and an extensive research program was undertaken. An initial study used a range of analyses, which showed that the behavior of the joint was influenced by the dynamic wheel loading and the characteristics of the joint. Field measurements were performed to verify the analytical conclusions, and the results are summarized. The field measurements included measurements of strains, bending moments, and deflections for a series of controlled truck loadings on a large modular joint. Braking and acceleration of vehicles produce the largest horizontal wheel forces and joint movement. The horizontal forces produced by overrolling (nonbraking and nonaccelerating vehicles) are small. Impact and rebound due to vertical loading are significant. Measurements are compared with fatigue design recommendations and correlated with analytical results. Recommended vertical and horizontal fatigue design loads are given for large-movement single-support-bar expansion joints.

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 111-121
  • Monograph Title: FOURTH INTERNATIONAL BRIDGE ENGINEERING CONFERENCE, SAN FRANCISCO, CALIFORNIA, AUGUST 28-30, 1995. CONFERENCE PROCEEDINGS, 2 VOLUMES
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00711716
  • Record Type: Publication
  • ISBN: 0309061091
  • Files: TRIS, TRB
  • Created Date: Sep 6 1995 12:00AM