Reliability Model for Bridge Columns under Seismic Loads

by Michel Ghosn, City Coll of New York, New York City, United States,
Ge Chen, City Coll of New York, New York City, United States,



Document Type: Proceeding Paper

Part of: Probabilistic Mechanics and Structural and Geotechnical Reliability

Abstract:

This paper develops a model for the analysis of the reliability of bridge columns under earthquake loads. Probability of failure is defined as the probability that the displacement ductility capacity of the bridge column is less than the ductility demand at the assumed earthquake level. Ductility capacity is formulated as a function of the column geometry and the volumetric ratio of confining steel. Ductility demand can be calculated by time history analysis of a bridge structure or as done in this study, using inelastic earthquake spectra. Results of this model expressed in terms of reliability indices are presented for bridges designed according to AASHTO's guidelines.

Subject Headings: Bridge columns | Seismic loads | Ductility | Bridge design | Earthquakes | Structural reliability | Load and resistance factor design

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