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A tuned mass damper (TMD), also known as a harmonic absorber or seismic damper, ... Location of Taipei 101's largest tuned mass damper. When installed in buildings, ...
[21] [26] With the tuned mass damper active, LeMessurier estimated that a wind capable of toppling the building had a one in fifty-five chance of happening any year. [27] [21] But if the tuned mass damper could not function due to a power outage, a wind strong enough to cause the building's collapse had one chance in sixteen of happening any ...
During the summer, the building used a conventional air-conditioning system, offsetting any energy saved by the heat-deflecting facade. [189] Citicorp Center was the city's first skyscraper to feature a tuned mass damper.
The building's upper-floor occupants suffered from motion sickness when the building swayed in the wind. To reduce the movement, contractors installed a tuned mass damper on the 58th floor. [13] As described by Robert Campbell, architecture critic for The Boston Globe: Two 300-ton weights sit at opposite ends of the 58th floor of the Hancock.
The building occupies a footprint of 28,000 square feet (2,600 m 2). Because of the small footprint and the fact that it is a non-steel-framed concrete building, this is the first building in the US to be designed with a tuned mass damper from the outset. While other skyscrapers in America have anti-sway systems, they were always added later.
Devices of the last kind, abbreviated correspondingly as TMD for the tuned (passive), as AMD for the active, and as HMD for the hybrid mass dampers, have been studied and installed in high-rise buildings, predominantly in Japan, for a quarter of a century. [4]
They are known for their modular construction techniques including the Mah-LeMessurier System for precast concrete in high-rise housing, the Staggered Truss System for high-rise steel structures, and the tuned mass damper used to reduce tall building motion. [1] One of the best known uses of the damper is the John Hancock Tower in Boston.
Base isolators for seismic isolation of buildings, bridges, etc. Base isolators made of layers of neoprene and steel with a low horizontal stiffness are used to lower the natural frequency of the building. Some other base isolators are designed to slide, preventing the transfer of energy from the ground to the building. Tuned mass dampers
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