ANIDIS - L'ingegneria Sismica in Italia, ANIDIS XIX & ASSISi XVII - 2022

Dimensione del carattere:  Piccola  Media  Grande

Seismic Isolation of the Terminal Core Roof at the Portland International Airport

Reid Zimmerman

Ultima modifica: 2022-08-09


The Terminal Core Redevelopment is a 1.6 billion USD project to expand and seismically upgrade the existing main terminal at the Portland International Airport in Portland, Oregon, USA. At the center of the project is the seismic isolation of a new approximately 300,000 square foot (28,000 square meter) roof which is being constructed over the existing ticketing, baggage claim, security, and concessions areas while the airport is fully open and functioning. This is achieved by setting approximately 50-foot (16.5 m) Y-Columns spaced at approximately 100 feet (30.5 m) on center through the existing main terminal roof and floor structures. Y-Columns are of diamond-shaped cross section built up of steel plates filled with cementitious grout. Seismic isolation devices are placed at the top of each "tine" of each Y-Column on which the new steel and mass timber roof is erected.

A total of 68 double-concave friction pendulum isolators by Maurer of Munich, Germany occur in the project with displacement capacities ranging between 16in and 22.5in (400 mm to 570 mm). Nonlinear response history analyses using a suite of eleven, two-component earthquake acceleration records considered upper- and lower-bound seismic isolation properties in combination with upper- and lower-bound soil properties for the Risk-Targeted Maximum Considered Earthquake (MCER, approximately equal to the 2,500 year return period event). Additional nonlinear response history analyses using a suite of seven, two-component earthquake acceleration records were performed for a deterministic earthquake on the Cascadia Subduction Zone. Full-scale prototype and production testing of the seismic isolators was performed at the European Centre for Training and Research in Earthquake Engineering (EUCENTRE) in Pavia, Italy and SISMALAB in Crispiano, Italy.

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