Sources of vibration and resonance Tuned mass damper

1 sources of vibration , resonance

1.1 earthquakes
1.2 mechanical human sources
1.3 wind
1.4 examples of buildings , structures tuned mass dampers

1.4.1 canada
1.4.2 china
1.4.3 germany
1.4.4 india
1.4.5 iran
1.4.6 ireland
1.4.7 japan
1.4.8 russia
1.4.9 taiwan
1.4.10 united arab emirates
1.4.11 united states of america
1.4.12 united kingdom

sources of vibration , resonance

unwanted vibration may caused environmental forces acting on structure, such wind or earthquake, or seemingly innocuous vibration source causing resonance may destructive, unpleasant or inconvenient.

earthquakes

the seismic waves caused earthquake make buildings sway , oscillate in various ways depending on frequency , direction of ground motion, , height , construction of building. seismic activity can cause excessive oscillations of building may lead structural failure. enhance building s seismic performance, proper building design performed engaging various seismic vibration control technologies. mentioned above, damping devices had been used in aeronautics , automobile industries long before standard in mitigating seismic damage buildings. in fact, first specialized damping devices earthquakes not developed until late in 1950.

mechanical human sources

dampers on millennium bridge in london. white disk not part of damper.

masses of people walking , down stairs @ once, or great numbers of people stomping in unison, can cause serious problems in large structures stadiums if structures lack damping measures.

wind

the force of wind against tall buildings can cause top of skyscrapers move more meter. motion can in form of swaying or twisting, , can cause upper floors of such buildings move. angles of wind , aerodynamic properties of building can accentuate movement , cause motion sickness in people. tmd tuned building s frequency work efficiently. however, during lifetimes, high-rise , slender buildings may experience natural frequency changes under wind speed, ambient temperatures , relative humidity variations, among other factors, requires robust tmd design.

examples of buildings , structures tuned mass dampers

canada

one wall centre in vancouver — employs tuned liquid column dampers, unique form of tuned mass damper @ time of installation.

china

shanghai world financial center in shanghai, china
shanghai tower in shanghai, china largest in world.

germany

berlin television tower (fernsehturm) — tuned mass damper located in spire.
vlf transmitter dho38 - cylindrical containers filled granulate in mast structure

india

atc tower delhi airport in new delhi, india — 50-ton tuned mass damper installed beneath atc floor @ 90m.
statue of unity in gujarat, india - 400-ton tuned mass damper located @ chest level of sardar patel statue.

iran

world trade center tabriz
tehran international tower

ireland

dublin spire in dublin, ireland — designed tuned mass damper ensure aerodynamic stability during wind storm .

japan

akashi kaikyō bridge, between honshu , shikoku in japan, world s longest suspension bridge, uses pendulums within suspension towers tuned mass dampers.
ribbon chapel in hiroshima, japan uses tmd damp vibrations in 2 intertwined helical stairways.
tokyo skytree
yokohama landmark tower

russia

sakhalin-i — offshore drilling platform

taiwan

taipei 101 skyscraper — contains world s largest , heaviest tuned mass dampers, @ 660 metric tons (730 short tons).

united arab emirates

burj al-arab in dubai — 11 tuned mass dampers.

united states of america

432 park avenue in new york city, ny
bally s bellagio, bally s caesars palace, , treasure island venetian pedestrian bridges in las vegas, nv
bloomberg tower/731 lexington in new york city, ny
citigroup center in new york city, ny — designed william lemessurier , completed in 1977, 1 of first skyscrapers use tuned mass damper reduce sway. uses concrete version.
comcast center in philadelphia, pa — contains largest tuned liquid column damper (tlcd) in world @ 1,300 tons.
grand canyon skywalk, az
john hancock tower in boston, ma — tuned mass damper added after built making 1st building use tuned mass damper.
one rincon hill south tower, san francisco, ca— first building in california have liquid tuned mass damper
park tower in chicago, il — first building in united states designed tuned mass damper outset.
random house tower — uses 2 liquid filled dampers in new york city, ny
theme building @ los angeles international airport los angeles, ca
trump world tower in new york city, ny

united kingdom

london millennium bridge — nicknamed wobbly bridge due swaying under heavy foot traffic. dampers fitted in response.
one canada square — prior topping out of shard in 2012, tallest building in uk.




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