The historic, 947-ft-long Laurel Street/Cabrillo Bridge, which passes over California Highway 163 in San Diego’s Balboa Park, has the architectural appearance of seven closed-spandrel cast-in-place reinforced concrete arches, and mimics the Spanish-Colonial style. The bridge was completed in 1914 for the Panama-California Exposition in San Diego. Chunks of original concrete or repair materials from beneath the arches had become dislodged and fallen to the ground below. Concerns about safety and potential structural performance problems prompted an investigation to be done in connection with bridge repairs being performed by the contractors, Erreca’s, Inc. and Caltrans.
CTLGroup was engaged to assess the bridge concrete’s quality, condition and future durability potential, in order to help develop repair and maintenance strategies. The firm reviewed bridge drawings and background information; visually reviewed the bridge pier conditions in accessible areas; documented observations with notes, sketches and photographs; hammer-sounded elevations based on observed conditions to identify possible delamination; performed field carbonation tests at selected core locations to evaluate depth of concrete carbonation; and removed core samples for laboratory testing.
Structural Engineering + Evaluation
Analysis of Extreme Loads: Wind, Earthquake, Blast
Repair, Restoration, Retrofit
Structural Condition Assessment
Structural Health Monitoring
Validation of Structural Behavior
Vulnerability Assessment & Risk Analysis
Microscopy / Petrography