Work sessions with the construction manager and steel, excavation and foundation contractors resulted in a series of colored maps defining the critical stages of analysis and design coordinated with construction activities. As areas of excavation proceeded in alternate quadrants, the contractor installed bracing trusses as soon as soil removal allowed. The system configuration changed continually as excavation progressed. #CLIMATE PLEDGE ARENA INSTALL#The historic roof had to be supported in the air during the demolition of the remaining structure without incurring damage, while also allowing sufficient access and clearance to install the permanent structure around the temporary structure.Įvaluation, design and construction planning for the temporary lateral force-resisting system required extensive collaboration among project team members. Since the foundations below existing columns would be undermined by the excavation for the new event level, our engineers designed a temporary roof-support system entailing 3,700 tons of temporary steel framing to uphold the majority of the roof’s gravity load and resist wind and seismic lateral forces during two years of construction. How do you support a roof the size of three football fields, weighing more than eight 737 jets, in a high seismic zone, while construction work occurs beneath? With plenty of expertise and ingenuity. This challenge drove nearly all facets of the project’s design and construction. #CLIMATE PLEDGE ARENA HOW TO#The central structural feat became how to support the existing roof while work continued below it. This distinction required that the roof, curtain wall and exterior concrete elements be preserved as part of the renovation. In fall 2017, KeyArena was classified by the Seattle Landmarks Preservation Board as a local landmark. The steel and concrete structure that now covers the arena was designed by modernist architect Paul Thiry in the late 1950s and constructed in 1961. We provided structural and construction engineering services to Populous for renovation of the 800,000-square-foot arena, which opened in time for the NHL's 2021-2022 season. Complicating matters further were the arena's location in a high seismic zone, just two miles from a fault line, and the project's very aggressive schedule. Most notable among these was how to demolish the structure and excavate 680,000 cubic yards of soil to make way for construction of a new world-class below-grade arena, all while temporarily supporting the roof structure above it. The near-total demolition of the structure below the roof presented several complex challenges. Thornton Tomasetti provided structural design and construction engineering for the renovation.īut what makes this project unique? It preserves the 1960s-era building’s iconic 44-million-pound roof structure and the exterior curtain wall. The $930 million renovation and expansion is now Climate Pledge Arena, a new 800,000-square-foot, below-grade venue that will hold more than 17,000 fans for hockey, basketball, concerts and other events, as well as a new parking garage. The historic KeyArena, which started out as the Washington State Coliseum for the 1962 Seattle World’s Fair, has undergone a major transformation, becoming home to the NHL’s newest franchise, the Seattle Kraken.
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