Lambeau Field, South End Zone and North End Zone Expansions, in Green Bay, Wis.

Lambeau Field, South End Zone and North End Zone Expansions



Lambeau Field opened in 1957 and is the oldest continually occupied NFL stadium. Thornton Tomasetti provided structural engineering and construction support services for expansions to the football stadium’s north and south end zones.

Completed for the 2012 / 2013 season, the north end zone expansion included a new stadium gate, a new 65-foot-tall by 150-foot-long scoreboard, a rooftop viewing terrace, and a six-story elevator tower. The south end zone expansion, completed for the 2013 / 2014 season, featured the addition of 6,600 seats with a snow melt system, new concession and club areas, six new viewing levels, a nine-story vertical transportation tower, and a new 70-foot-tall by 220-foot-wide scoreboard. Using 5,500 tons of steel and 6,600 yards of concrete, the south end zone structure adds 336,000 square feet and increases the seating capacity to 80,000, making Lambeau Field one of the NFL’s largest stadiums.

To overcome the challenge of building on top of an existing stadium, Thornton Tomasetti used SAP 2D and 3D analysis models to identify the necessary reinforcements of existing columns and baseplates. A cast-in-place concrete tread and riser system for the new seating levels allowed for construction over the existing lower bowl seating. Thornton Tomasetti also provided mill order and fully connected Tekla models, tower crane foundation design, and eight months of full-time on-site representation services to aid in creating an efficient construction process.

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While the range of shapes and forms that can be designed with modern modeling tools is almost limitless, geometric discipline is still essential for budget control. When forms are still in flux, the design team can use our proprietary tools to interactively study multiple geometric options and establish optimized shapes for structural frames and building surfaces, along with related systems.

Parametric modeling applies parameters such as materials, dimensions or performance criteria to define elements or element categories within a model. Once entered, they can be altered, individually or in combination, to explore and easily incorporate design changes. These 3D models contain intelligent information and can serve as deliverables, or they can be used to generate 2D drawings. Parametric models improve documentation speed and quality, enhance visualization, quickly perform geometry-based analytical tasks and easily calculate material quantities.

Generative modeling uses scripts – instead of direct input – to generate elements, providing even greater flexibility in iterating and testing many options. It allows architects, engineers and other project stakeholders to work together to quickly evaluate any number of concepts and variations.