Nonlinear Behavior of Elastomeric Bridge Bearings. Volume 2. User's Manual for NEBBA2, a Two-Dimensional Nonlinear, Finite Element Analysis for Elastomeric Bearings

摘要

A nonlinear theory and finite element analysis describing the behavior of elastomeric bridge bearings is presented. The theory includes the nonlinearities resulting from the large deformations and deflections, and the nonlinear elastic behavior of the elastomer. In addition, the large deflection of the reinforcement and possible nonlinear behavior due to lift-off between the bearing and the loading surface are included. Two (2-D and 3-D) FORTRAN 77 computer programs for the evaluation of the analysis are described. The validity and applicability of the theory and analysis are demonstrated by the results of an extensive validation study which compares predictions of bearing behavior to available experimental evidence. The results of a parameter study for bearings of various designs and subjected to a wide range of loading conditions are presented. While the chief motivation for the study was to demonstrate the utility of the theory and analysis, the results of the study should be of use in addressing problems arising in bearing design. An outgrowth of the study was the development of a correction factor to the traditional shape factor definition.