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10 March 2008

Professor Mehdi Setareh has key role in dynamic structure in Michigan

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Details of the design and testing of the structure are included in the cover story of the January 2008 issue of the Modern Steel Construction published by the American Institute of Steel Construction:

The Lamar building is the headquarters of the Lamar Construction Company in Hudsonville, Michigan, which provides about 6000 square feet of office space. The main structure, consists of two 16 feet-deep, 112 feet long trusses, cantilevered from a 24 in. thick concrete core which is used for building circulations. The primary structural concern was the building’s susceptibility to movements due to wind and the live load of people walking in the hallway areas. Professor Setareh’s role as the vibration consultant was to conduct the analysis of the structure and provide possible changes to the structure to prevent these problems. He conducted the analyses of the building and modified the structure to avoid any vibrations due to wind and human traffic. However, to provide an economical solution and at the same time considering the variations in building construction, he also made provisions for placement of Tuned Mass Dampers (TMD) as backup systems to reduce the floor vibration if it proved to be a problem after the building completion. Therefore, to check the need for TMDs, Professor Setareh conducted two series of vibration field tests on the structure, one right after the concrete floor was poured and the other at the building completion while occupied. Using a shaker and a series of sensors the dynamic properties of the floor structure were measured, which the results indicated that the building behaved as predicted by the analysis and there was no need for TMD placements.