What is a tuned mass damper, there are those buildings that use a tuned mass damper

The Tuned Mass Damper (TMD) consists of a block, a spring and an energy-dissipating damping system. The vibration frequency is adjusted to the vicinity of the main structure frequency and the structural resonance characteristics are changed to achieve the purpose of vibration reduction.

The TMD concept was first applied by Frahm in 1909 (Frahm, 1909) to reduce the rolling motion of ships as well as hull vibration.

TMD dampers can reduce the maximum amplitude of an object when the weight is much smaller than the object (structure), thus preventing discomfort, breakage, or complete damage. They are often used in buildings, power transmission, cars, ships, and other aspects of life.

Tuning mass damper, also known as dynamic vibration absorber, is a kind of structural passive control measure, mainly used for wind resistance and improving human comfort.

By adding an auxiliary mechanism to the main structure, when the main structure is subjected to external dynamic force, it provides a force with almost equal frequency and opposite the direction of the structure to offset part of the structural response caused by external intensity.

Its working principle is similar to the emission of electromagnetic waves, in the process of reception in the tuning process, wind load or pedestrian load acts on the main structure, in the main structure to generate mechanical waves, called main waves, damper in the mechanism of mechanical waves, called signal waves, signal waves propagate in the main wave, similar to electromagnetic wave tuning in the main wave, which is the origin of "tuning" in the name of the damper.

The force of the damper on the structure includes the force of inertia, hence the name: tuning mass damper.

The purpose of installing TMD is to resist wind and improve human comfort.

The two most common TMD dampers are:

One isViscous TMD damper, that is, a TMD damper that uses a viscous method for energy consumption, and one isEddy current type TMD damper, that is, a TMD damper that uses eddy current for energy consumption.

Some of the most famous examples of TMD dampers in the world are:

our country:

Shanghai Tower: Eddy current passive type

Shanghai World Financial Center(ShanghaiWorld Financial Center): Active type is adopted

TaiwanTaipei 101 Building: Adopt viscous passive type

Abroad:

Canada

One Wall Centre Vancouver - Uses tuned fluid column dampers

TorontoCN Building。

Germany

The Berlin TV Tower (Fernsehturm) – a tuned mass damper located at the spire.

VLF Transmitter DHO38 – Cylindrical container filled with particles in a mast structure

India

ATC Tower at Delhi Airport, New Delhi, India – A 50-ton tuned mass damper installed under the 90-meter ATC layer.

The statue of the goddess of unity in Gujarat, India – two 250-ton tuned mass dampers, located on the chest of the statue of Sardar Patel.

Iran

Tehran International Tower

Ireland

Dublin Spire in Dublin, Ireland – Designed with tuned mass dampers to ensure aerodynamic stability in storms.

Japan

The Akashi Kaikyō Bridge, located between Honshu and Shikoku in Japan, was once the longest suspension bridge in the world, and its pendulum inside the suspension tower serves as a tuning mass damper.

Ribbon Chapel in Hiroshima, Japan, uses TMD to dampen vibrations from two entangled spiral staircases.

Tokyo Sky Tree

Yokohama Landmark Building

Chiba Port Building

Kazakhstan

Almaty Tower

Monument to the "Kazakh Ellie" in Nur-Sultan Independence Square

Russia

Monument to the Victory on Poklonnaya Hill, Moscow

Olympic torch in Sochi Olympic Park,

Steel chimneys in Moscow (thermal power plant 27), Ryazan power station, Sochi thermal power plant, etc.

Sakhalin No. 1-- Offshore drilling platform

United Arab Emirates

Burj Al Arab Dubai•11 tuning mass dampers.

United Kingdom

London Millennium Bridge - nicknamed the "Swing Bridge" for swaying under heavy pedestrian traffic. Dampers are installed for this.

Canada Square - This was the tallest building in the UK before the Shad Tower was topped out in 2012.

United States

111 West 57th Street, New York City - Contains one of the world's heaviest solid dampers, weighing 730 tons.

432 Park Avenue, New York City

Barry goes to Bellagio, Barry goes to Caesars Palace, and Jumbo Island goes to the Venetian Pedestrian Bridge in Las Vegas

Bloomberg Building/731 Lexington, New York City

The Citigroup Center in New York City – designed by William Lemesurier and completed in 1977, was one of the first skyscrapers to use tuned mass dampers to reduce sway.

Comcast Center in Philadelphia - has the world's largest tuned fluid column damper (TLCD) at 1200 tons.

Comcast Technology Center in Philadelphia – a set of five tuned dampers containing 125,000 gallons of water, about 500 tons, located on the 57th floor between hotel rooms and lobbies.

Grand Canyon Skyway, Arizona

John Hancock Tower in Boston - the first building to use a tuned mass damper, which was added after the construction was completed.

One Madison, New York City

One Rincon Hill South Tower, San Francisco – The first building in California to be fitted with liquid-tuned mass dampers

Chicago Park Tower - The first building in the United States to feature a tuned mass damper design from the beginning.

Random House Tower – Two fluid-filled TMD dampers are used in New York City

Los Angeles International Airport themed building

Trump World Tower, New York City