Dynamic Response Prediction for Earthquake Resistance Design of Bridge Structuresby W. D. Liu, Imbsen & Associates Inc, United States,
F. S. Nobari, Imbsen & Associates Inc, United States,
R. A. Imbsen, Imbsen & Associates Inc, United States,
Abstract: Newly developed nonlinear analysis procedures for assessing the earthquake resistance of bridges have been incorporated into the computer program SEISAB (SEISmic Analysis of Bridges). The new version SEISAB-II, which includes the nonlinear capabilities, was developed under the sponsorship of the National Science Foundation as part of their earthquake hazard mitigation program. The analytical model to predict the complex interaction of abutments, pile and superstructure under longitudinal earthquake excitation is presented. Preliminary results based on a simple test structure indicated several advantages of allowing abutment backwall to fail. These include: period elongation and therefore reducing the earthquake loading, multiple pounding between abutment and deck is reduced significantly, and reduced ductility demand on the column. Additional aspects of the subject are discussed.
Subject Headings: Earthquakes | Load and resistance factor design | Bridge design | Dynamic structural analysis | Bridge tests | Bridge abutments | Structural response | Nonlinear analysis
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