Caltrans’ Toll Bridge Seismic Retrofit Program involved performing vulnerability assessments and retrofit designs for the state-owned toll bridges. To determine bridge response and evaluate seismic performance, a finite element model of each toll bridge was created using the finite element program ADINA. Following recommendations of the Seismic Advisory Board the project main goals included the following: (a) update the existing models to conform to the current version of ADINA; (b) create a system to efficiently update the models for newer versions of ADINA; (c) create a standard system for model consistency; (d) create a system to convert Strong Motion Instrumentation Program (CSMIP) free-field motions to input ground motions for the ADINA model, and compare the analytical results with CSMIP instrumentation recordings; (e) use the ADINA models for post-earthquake evaluation of the bridges using input motions derived from the CSMIP, and direct maintenance crews to inspect the predicted regions of damage; (f) gain increased confidence in the existing and any future seismic retrofit work through the models. This paper will describe challenges the project team encountered during the implementation phases of this project.
California Toll Bridges Analytical Model Strong Motion Instrumentation Program (CSMIP) Calibration Project
Alex Krimotat, Hassan Sedarat, Alexander Kozak, Steve Mitchell, Hubert Law, Chien Tai Yang, Ignatius Po Lam
California Department of Transportation (Caltrans)