Inquiries & Data
How does a retractable roof handle severe wind loads?
Retractable roofs are engineered using robust steel trusses mounted on mechanized bogies. When closed, complex locking mechanisms engage with the main stadium structure, effectively tying the kinetic pieces into the static framework to transfer lateral wind loads directly into the concrete foundation.
Why do some stadiums use sliding pitches instead of artificial turf?
Top-tier sports regulations often mandate natural grass. However, deeply enclosed multi-tier stadiums prevent adequate sunlight and airflow. Sliding trays (like at the Sapporo Dome) allow the heavy natural pitch to reside outdoors in ideal climatic conditions, sliding in only for event days over sturdy rail infrastructure.
What is ETFE and why is it replacing glass?
Ethylene Tetrafluoroethylene (ETFE) is a fluorine-based plastic. It is only 1% the weight of glass, significantly decreasing the load on the stadium's steel superstructure. It is highly durable, self-cleaning, and transmits more UV light, which is crucial for internal pitch growth.
How is the "cauldron effect" measured acoustically?
Acousticians measure the reverberation time (RT60) and Sound Pressure Levels (SPL). By steepening the bowl seating and creating an acoustically reflective roof overhang, engineers can increase the decibel level directed at the pitch by up to 20%, dramatically boosting home-field advantage.