Soil Structure Interaction Effects on Base Isolated Bridges

Abstract eng:
Base isolation has already been used extensively for buildings in the United States, Japan, New Zealand, Italy and Chile among other countries. Its extension to bridges was a logical step. A large number of papers have been written over the last 15 to 20 years to investigate the adequacy of various types of isolation pads, their material properties and their behavior under different types of loads, to compare the seismic response of bridges with or without isolation pads, to study the effect of the relative stiffness of the pads compared to the stiffness of the structure, to assess the importance of soil structure interaction effects, and to develop analytical models and simplified design procedures. There are still, however, a number of questions that have not been fully addressed, particularly in relation to the nonlinear behavior of the isolation pads, and the combined effects of soil structure interaction. This work investigates more fully the combined effects of nonlinear behavior of the isolation pads and the inertial soil structure interaction effects on the seismic response of a collection of representative base isolated bridges on different types of soil.

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