Federal Building, San Francisco

Location: San Francisco, CA

Project Type: Peer Review/Plan Review

Structural/Seismic peer review of San Francisco’s new federal building, designed by Thom Mayne. The new high-rise concrete frame/shear wall tower building includes two large steel braced frame ancillary structures and an underground parking garage covering the entire site. The structural design was unique in that the aspect ratio of the shear walls in the office tower was nearly 10 to 1. Arup was the engineer of record. [With Degenkolb Engineers]

BART Administration Building Dismantling

Location: Oakland, CA

Project Type: Public Sector

Complete building dismantling scheme (including construction means and methods) for the removal of this six-story, steel frame, Bay Area Rapid Transit (BART) office building. The building was situated atop BART’s Lake Merritt Station and computer operations center, which controls train operations on the entire BART system. The dismantling sequence was very detailed, involving each structural component in the building. The building was successfully dismantled, using a tower crane, with no impact on BART operations. [With Degenkolb Engineers]

Federal Office Building, Los Angeles

Location: 11000 Wilshire Boulevard, Los Angeles, CA

Project Type: Public

Seismic evaluation of Los Angeles’ Federal Office Building, a 17-story, 1960s steel frame structure. The seismic system consists of welded pre-Northridge moment resisting frame connections in one direction and concrete shear walls with back-up welded moment frames in the other. The analysis was performed in accordance with ASCE 41-13 to the BSE-1E and 1N performance criteria. The analysis consisted of an initial three-dimensional linear model and follow-up with two-dimensional non-linear analyses using the Perform 3D program. The non-linear analyses were performed on both the original structure and the structure with strengthening added. The addition of passive wall dampers was the most effective solution. [With Degenkolb Engineers]