Abstract

This paper investigates the implications of ground motion spatial variability on the seismic response of an extended highway bridge. an existing 59-span, 2,164-meter bridge with several bearing types and irregularity features was selected as a reference structure. the bridge is located in the New Madrid Seismic Zone and supported on thick layers of soil deposits. Site-specific bedrock input ground motions were selected based on a refined probabilistic seismic hazard analysis of the bridge site. Wave passage and ground motion incoherency effects were accounted for after propagating the bedrock records to the ground surface. the results obtained from inelastic response-history analyses confirm the significant impact of wave passage and ground motion incoherency on the seismic behavior of the bridge. the amplification in seismic demands exceeds 150%, whereas the maximum suppression of these demands is less than 50%. the irregular and unpredictable changes in structural response owing to asynchronous earthquake records necessitate in-depth seismic assessment of major highway bridges with advanced modeling techniques to realistically capture their complex seismic response. © 2011 American Society of Civil Engineers.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Extended highway bridges; Ground motion incoherence; Inelastic dynamic analysis; Seismic assessment; Site effects; Wave passage

International Standard Serial Number (ISSN)

1084-0702

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 American Society of Civil Engineers, All rights reserved.

Publication Date

01 May 2011

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