Seismic Modeling of Long-Span Bridges


  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal


Title: Seismic Modeling of Long-Span Bridges

Author(s): W. G. Godden

Publication: Special Publication

Volume: 73


Appears on pages(s): 107-124

Keywords: (structures ); bridges cable-supported structures; curved beams; dynamic response; dynamic structural analysis; dynamic tests; bridges;joints earthquake resistant structures; failure; highway (junctions);

Date: 3/1/1982

This paper discusses shaking table tests conducted on models of two long-span curved highway bridges to study seismic response. The first is a microconcrete model study of a multi-span highway overcrossing of the type that failed in the 1971 San Fernando earthquake. This shows the predominant influence of the expansion joints in the system on gross dynamic behavior and on the failure load. The second is an elastic model study of a proposed single-span cable-stayed curved box girder bridge designed without expansion joints and cast integrally with the abutments. This shows the small damping in such a system, the influence of cable vibrations on the overall dynamic behavior, the degree to which linear dynamic analysis is applicable in determining seismic response and the efficiency of such a design in resistin horizontal ground motions.