A case of the shakes

Article Abstract:

Structural engineers devised a way to limit structural vibrations in New York, NY's Terrace on the Park without disrupting the building's activities. The original floor framing was stable enough for its original use but the building's conversion into a dance hall caused highly discernible and disturbing structural deflections. A thorough analysis through computer modelling showed the feasibility of using tuned mass dampers instead of erecting new columns. The final design solution eliminated the vibrations, facilitated easy maintenance and reduced construction costs.

Methods, Damping (Mechanics), Damping (Physics), Ballrooms

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Unique pile combination supports new tennis complex

Article Abstract:

The construction of a tennis stadium for the U.S. Open in Flushing Meadows, New York, employs a combination of tapered pile that is welded to a straight pile with steel shims. The 42 acre site faces settlement problems that affect the existing facilities. The engineers face a challenge of adverse soil conditions. The presence of fill, compressible organic matter and sand in addition to support structures from the World's Fair under the ground weaken the foundation. The stadium court consists of four levels including 90 luxury seats and boxes.

Usage, Piling (Civil engineering), Pilings (Building), Tennis courts

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No more flapping in the wind

Article Abstract:

Engineers are using a high-tech damper to prevent wind induced vibrations in the air-traffic control tower (ATCT) at Washington D.C. National airport. The external tuned mass damper's installation on the ATCT limits the maximum horizontal acceleration at the cab level for a once in ten years windstorm. The structural dynamics improve with a load-transfer system, which is typically designed to take care of low values of damping. Both are necessary in optimum combination to steady the structure at all times.

Innovations, Airports, Structural dynamics, Air traffic control towers

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