Title

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

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.

Publication 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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