McLean & Schultz: Structural Engineering & Architecture

This 33 feet wide by 489 feet long bridge was built in 1944 and consists of nine spans. As part of the Local Agency Seismic Retrofit Program, McLean & Schultz provided consulting services to Caltrans, Division of Structures. The evaluation was performed in accordance with the AASHTO LRFD Bridge Design Specifications, using resistance factors for the Extreme Event I limit state. While a "Strength Criterion" was used in the seismic assessment of the columns, a "Displacement Criterion" was used in assessing the global stability of the structure. The final retrofit measures included extension of existing collision walls, providing vertical restrainers on columns, widening of concrete girder seats at abutments, and transverse strengthening of superstructure hinges.
Oil Junction Overhead