Nonlinear time history analysis for the seismic retrofit of the Richmond-San Rafael Bridge

摘要

The Richmond-San Rafael Bridge carries four lanes of Interstate 580 over the northern portion of San Francisco Bay between the cities of San Rafael and Richmond. It was included in the California State Toll Bridge Retrofit Program in the 1990s. Caltrans commissioned the retrofit design to a joint venture of Ben C. Gerwick, Inc., DMJM+Harris, and Jacobs-Sverdrup, with support from subconsultants, including structural analysis performed by ANATECH Corp. and ICF Kaiser Engineers. ANATECH performed global nonlinear time history analysis using the ADINA program as a project deliverable. This paper describes the modeling assumptions and approach, with emphasis on the decision making required to balance model refinement against practical limits on run times and usability of results. The paper concludes with a summary of lessons learned from this and other toll bridge global analyses conducted during the California bridge seismic retrofit program.