This landmark building was originally constructed in the early 1900s using a reinforced concrete frame. Even with that steady base, later analyses and geoseismic evaluations indicated the building was expected to perform poorly in the event of an earthquake.
A new plan called for the installation of 265 new base isolators. This required a complete removal of the existing foundation, plus a method to temporarily support the loads of individual building columns. A collaborative effort with the construction manager led to an ingenious method of load transfer, saving months of construction time and millions of dollars.
Today, each of the 256 isolators is designed for a horizontal displacement of 24 inches in any direction, making a total swing of 48 inches from one extreme to the other. Existing columns, walls, and the dome were also reinforced for earthquake protection. Electrical, air conditioning, heating, and lighting systems were updated to current standards. Original artifacts and architectural features—including paintings, murals, statues and the marble staircase—were also restored and repaired.
National recognition to the capitol building includes the 2010 Outstanding Civil Engineering Achievement Award Top 5 Finalist by the American Society of Civil Engineers and 2009 Outstanding Project Award Finalist by the National Council of Structural Engineering Association.
Salt Lake City, UT