Jul 1, 1999
The current AASHTO Specifications do not have adequate guidelines for seismic modeling and analysis of steel bridges. Bridge designers in seismic zones have always raised concerns about the adequacy of beam models in performing seismic analysis of steel bridges. This...
May 24, 1999
As a part of the Posey and Webster Street Tubes seismic retrofit project, finite element analysis was used to study the soil–structure interaction behavior due to earthquake ground motions. This paper summarizes the nonlinear analysis activities for the Alameda Tubes....
Oct 30, 1998
Seismic retrofit of steel bridges requires more advanced analysis techniques to determine capacities and predict inelastic performance parameters. Normal engineering analysis practice assumes linear-elastic behavior for structural members, which fails to reliably...
Sep 1, 1998
Two immersed tube tunnels used for vehicular traffic in the seismically active San Francisco Bay Area were built over 30 years ago with little consideration to seismic effects. A seismic retrofit study was conducted to assess the vulnerability of the tubes to seismic...
Jun 1, 1998
The purpose of this research was to provide the information required to finalize seismic retrofit design of the San Francisco-Oakland Bay Bridge. The emphasis was on conducting cyclic tests of half-scale specimens representing laced members and joints of the Bridge....
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