Inelastic Response of the Cypress Viaduct to the Loma-Prieta Earthquake

    Authors

    S. K. Kunnath;J. L. Gross

    Comments

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    Keywords

    Bridges; Damage Evaluation; Dynamic Response; Elevated Highway; Structures; Failure Analysis; Modeling; Reinforced Concrete; Seismic; Analysis; Engineering, Civil

    Abstract

    The inelastic damage evaluation of a typical double-deck bent of the Cypress Viaduct which collapsed during the 1989 Loma Prieta earthquake is presented. A model of the bent consisting of spread plasticity-based beam-column elements to represent the piers and deck, and shear panel elements to represent the pedestal region was developed. To accurately determine beam and column moment-curvature relationships, separate computer analyses using an element fibre model were conducted. In addition, a smeared-crack approach finite element analysis was employed to determine the lateral load-deformation relationship of the pedestal regions. The model of the Cypress Viaduct was subjected to the Oakland Outer Harbor Wharf ground acceleration record in the plane of the bent. The analytical model was calibrated using static lateral load tests, ambient and forced vibration tests, and observed performance. The results of time-history analyses, which include a prediction of member damage, indicate that collapse was initiated by a shear failure of the pedestal regions.

    Journal Title

    Engineering Structures

    Volume

    17

    Issue/Number

    7

    Publication Date

    1-1-1995

    Document Type

    Article

    Language

    English

    First Page

    485

    Last Page

    493

    WOS Identifier

    WOS:A1995RX36300002

    ISSN

    0141-0296

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