Oklahoma City, Okla.
Thornton Tomasetti provided structural engineering services for oil and natural gas company Devon Energy’s corporate headquarters, which was completed in the spring of this year. At 850 feet, it is the tallest building completed in the United States this year and is expected to be the third tallest in the world, according to the Council on Tall Buildings and Urban Habitat (CTBUH). The tower features a concrete core structural system with concrete framing from the core to exterior. Its three-sided base is enclosed by a cable net wall that spans three floors. A seven-story, 120-ft tall glass rotunda with architecturally exposed steel, interior balconies and a glass roof serves as the entrance and provides space for special events. A crown extending 60 feet above the roof tops off the tower. Among the project challenges was a water table 10 feet above basement level, which was addressed with a 12-ft mat under the tower core, secant piles, piers in sandstone and a specially designed ballast slab. Our scope included a six-story podium and an expansion of an existing precast concrete garage connected to the tower that increased parking space nearly threefold. The project is seeking LEED Gold certification. The design architect was Pickard Chilton. Kendall / Heaton Associates, Inc. was the architect of record.