William K. Nakamura U.S. Federal Courthouse

This GSA federal courthouse is located in downtown, Seattle, WA, was built in 1939, and is listed on the National Register of Historic Places. Hinman Consulting Engineers provided blast consulting services which included a risk assessment, perimeter security, and large scale modernization. Hinman was responsible for providing blast mitigation analysis and design for the renovation and seismic upgrade for this $74 million, 178,000 sf. federal courthouse.

KPFF provided civil and structural engineering services for the $80 million upgrade of this historically significant U.S. Courthouse, designed to achieve LEED certification. Under the direction of the GSA and Federal Courts, work for this project included the seismic rehabilitation, an upgrade of the building, addition of a new underground parking structure, and a rehabilitation of the terra cotta cladding. The new underground parking garage features a secured entry portal for parking and a landscaped plaza on the lid of the garage.

In addition to strengthening measures a new blast resistant exterior façade and perimeter anti-ram barrier system were also provided.

KPFF’s project scope of services included civil engineering services which consisted of erosion and sedimentation control, grading for site work and ADA accessibility, drainage, stormwater detention, and the foundation drainage system for the parking garage. Street improvements included a vehicle barrier system located in the public right-of-way for building and perimeter, signal and channelization modifications, and bus stop relocation.

Hinman's project scope of services included blast mitigating measures for primary and secondary entrance lobbies, new mail room, loading dock, and U.S. Marshal spaces. Hinman performed site observation, documented the building's existing conditions, and designed strengthening measures of existing building elements in accordance with the ISC Security Design Criteria. In addition to strengthening measures, a new blast resistant exterior façade and perimeter security/ anti-ram barrier system were also provided. Hinman collaborated closely with the Architect and Structural Engineer to develop design solutions that were sensitive to the historic fabric while delivering a design within the project budget goals.