IDEAS2 Award for Great American Tower Tiara
The steel tiara structure that crowns Cincinnati’s tallest building has been awarded the 2012 Innovative Design in Engineering and Architecture with Structural Steel (IDEAS2) award presented by the American Institute of Steel Construction (AISC). Thornton Tomasetti provided structural design services through construction administration to architect HOK for the 1.6-million-sf, 41-story, LEED Gold-certified tower and 130-ft-tall tiara structure. The award was presented to the project team at a ceremony held at the tower Thursday, July 19. The tiara was one of four structures to receive the award in the projects with a construction cost of less than $15 million category. Conceived by Gyo Obata of HOK, the 400-ton, tiara was inspired by a tiara worn by Diana, Princess of Wales and Cincinnati’s nickname, the Queen City. Measuring 159 feet by 93 feet, it is composed of 15 ornamental structural steel arch elements uniformly supported by 14 arching structural steel columns woven through the tiara, creating a two-way support system. It features more than 750 hollow structural section (HSS) elements, ranging in diameter from 4 inches to 16 inches. The design went through many iterations and steel configurations, with the goal of finding the proper balance between aesthetic and financial requirements. We also provided geometric evaluation, final structural analysis with value engineering, connection design and a 3-D Tekla model and steel shop drawings to Owen Steel Company.