Evaluation of laminated circular elastomeric bearings

Husam Najm, Raxit Patel, Hani Nassif

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


This paper evaluates the behavior and performance of laminated circular elastomeric bearings and compares them to those of square and rectangular bearings. The study included an experimental evaluation and a nationwide survey of state Department of Transportations on the use and performance of circular bearings and bearings in general in their states. The experimental investigation studied the bearings' behavior in compression, compression and rotation, and compression and shear. Results from this limited study showed that the three bearings have similar stress-strain behavior in compression and they are in agreement with the AASHTO LRFD guide stress-strain curves. In compression and rotation, the AASHTO LRFD substructure moments are slightly less than the measured values for circular bearings and rectangular bearings rotated about their strong axis for a compressive stress of 10.3 MPa (1.5 ksi) and slightly higher than those of rectangular bearings rotated about their weak axis. In compression and shear, the shear stiffness of circular and square bearings is in agreement with theoretical values within the range of design displacements. Results from the survey showed that many states are using circular bearings and more states would consider using them, however no maintenance or monitoring data were available on their short-term and long-term performance.

Original languageEnglish (US)
Pages (from-to)89-97
Number of pages9
JournalJournal of Bridge Engineering
Issue number1
StatePublished - 2007

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction


  • Bearing capacity
  • Compression
  • Elastomer
  • Rotation
  • Shear


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