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Construction Tech Review | Monday, February 10, 2020
By replacing the current devices called tuned mass dampers (TMDs) with new vibration-control devices based on Formula 1 technology, slender structures that can withstand high winds can be built.
FREMONT, CA: Based on Formula 1 technology, researchers are developing new vibration-control devices to build needle-like high rise skyscrapers to withstand high winds.
Existing devices like tuned mass dampers (TMDs) are installed on the top floors of tall buildings, which can act as heavyweight pendulums that counteract building movement caused by winds and earthquakes. These TMDs are also known as a harmonic absorber or seismic damper, which is a device mounted on top of the structures to reduce the amplitude of mechanical vibrations that can prevent damage and structural failure. However, they weigh up to 1,000 tons and span five stories in 100-story buildings, which will add millions to building costs and occupying a lot of space in tight city centers. Researchers have found a lightweight and compact inerters, which resembles those developed for the suspension systems of Formula 1 cars that can reduce the required weight of present tuned mass dampers by up to 70 percent.
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It is possible to build taller and thinner buildings without causing seasickness for occupants when it is windy with smaller and lighter TMDs. In large cities, where space is the top of all considerations, this technology can be a game-changer. Also, building slender structures will require fewer materials and resources and will cost less while being more sustainable. The new devices have shown that up to 30% less steel is needed in beams and columns of typical 20-story steel building.
The new device can also reduce floor acceleration. They are useful in ensuring that buildings can withstand high winds and earthquakes. The inerter-based vibration control technology can significantly reduce the risk with low up-front cost in new, even very slender, buildings and with small structural modifications in existing buildings where even moderate winds can cause seasickness or dizziness to occupants.
On the other hand, carbon emission can be reduced as it requires fewer materials. Harvesting energy from wind-induced oscillations and powering wireless sensors used for inner building climate control is feasible with the new technology.
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