This presentation details the structural engineering design and construction strategies used to transform Seattle’s landmarked KeyArena into the 800,000-sf, mostly below-grade Climate Pledge Arena, while preserving the existing façade and supporting the 44-million-lb roof structure throughout construction. Completed in time for the start of the NHL 2021–2022 season as the home of the league’s newest franchise, the Seattle Kraken, the project became the world’s first net-zero carbon–certified arena.
The presentation will begin with a history of the original structure, including previous renovations since its original construction for the 1962 World’s Fair. Primary discussion topics include temporary support of excavation and the existing roof, performance-based seismic retrofit approach, rigging grid design, the interface between new and existing structures, and the use of tuned mass dampers for the 275-ft press bridge truss. The session will share key challenges and the unique design and construction approaches employed on this technically demanding retrofit to deliver a world-class sports and entertainment venue.
About Brian MacRae
Brian MacRae is an Associate Principal and structural engineering leader in Thornton Tomasetti’s Seattle office with more than 20 years of experience. He leads teams on a wide range of building types including mission-critical, education, healthcare, sports, commercial, and residential. Brian’s technical expertise includes performance-based seismic design and seismic retrofits. Notably, he led the seismic retrofit of the historic roof, new below grade parking garage and loading dock tunnel, and preservation of the historic facade for the redevelopment of Seattle’s Climate Pledge Arena.