Seismic Evaluation of the Tied-arch Bridge Across the Mississippi River on I-40

by W. David Liu, Imbsen & Associates, Inc, Sacramento, United States,
Roy A. Imbsen, Imbsen & Associates, Inc, Sacramento, United States,
Richard J. LeBeau, Imbsen & Associates, Inc, Sacramento, United States,
Farid S. Nobari, Imbsen & Associates, Inc, Sacramento, United States,
Lelio H. Mejia, Imbsen & Associates, Inc, Sacramento, United States,



Document Type: Proceeding Paper

Part of: Structures Congress XII

Abstract:

The bridge reported in this paper is a two-span steel tied-arch bridge supported on massive caisson foundations. Site specific seismic studies were carried out to establish the ground motion input at two levels. Spatially-varying ground motion time histories were generated. Seismic soil-structure effects were taken into account. Dynamic behavior characteristics of the tied-arch structure are identified and multiple-support-excitation seismic response analyses were carried out to identify structural vulnerabilities.

Subject Headings: Steel bridges | Bridge foundations | Seismic tests | Seismic effects | Bridge tests | Structural behavior | Steel structures | Mississippi River

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