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現在の単語数: 697語

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作成日: 2024/04/04 11:08

更新日: 2025/12/08 15:36

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How Taiwan's tallest building survived the earthquake

Taiwan has been hit by its strongest earthquake in 25 years, killing at least nine people, toppling buildings and even triggering tsunami warnings.

But amid the chaos, eerie footage shows the island's tallest building – the $1.8 billion Taipei 101 skyscraper – gently swaying like a stick in the breeze.

Measuring 1,671 feet in height, the building is fitted with an ingenious solution that reduces overall building sway by 40 per cent during quakes and winds.

A 660 metric ton golden sphere called the 'tuned mass damper' hangs inside the building from the 92nd floor.

As the building moves in one direction, the steel sphere sways in the other direction and maintains the building's overall balance.

READ MORE: Huge 7.5 magnitude quake rocks Taiwan

If wind or the force of an earthquake pushes the tower to the right, the sphere will provide an immediate and equal force to the left, cancelling out the initial motion.

So although the tower sways, it doesn't topple.

It's what's known as a 'passive damping system' meaning it operates without any external power or control – just gravity and the movement of the building.

Meanwhile, hydraulic pistons underneath the massive sphere absorb and dissipate the energy as heat.

Dr Agathoklis Giaralis, a professor of structural dynamics at City, University of London, described the clever spherical device as 'like a pendulum'.

'This steel sphere rests on damping devices which are designed to dampen the relative sway movement between the structure and the sphere, acting in a similar way to the shock absorbers in car suspensions,' he told MailOnline.

Although it's odd to see a building swaying, modern skyscrapers are built to be flexible, especially in earthquake-prone zones like Taiwan.

'The materials they are made out of are elastic which means that they stretch or contract according to the changing loads acting on them,' Professor Antony Darby at the University of Bath's Department of Architecture and Civil Engineering told MailOnline.

'The amount of this deformation in an individual element (e.g. a beam or column) is only very small, but when you multiply this across all the elements in a tall building, this can lead to significant lateral [sideways] movements.

'These movements are not dangerous to the structure itself, but, if excessive can lead to discomfort to occupants.'

READ MORE: Moment Taiwan is hit by mega earthquake on live TV

Construction of Taipei 101 began in 1999 and was completed in time for New Year's Eve 2004, when it finally opened to the public.

It was designed to resemble a bamboo shoot rising upwards in eight sections – looking like a series of square buckets stacked one on top of the other.

Every floor was installed with supporting steel 'outrigger trusses' running from the building's core to its outer columns to increase the towers stiffness.

While other tall buildings keep tuned mass dampers hidden, Taipei 101's is visible to visitors on the 88th through 92nd floors, making it something of a tourist attraction.

Unfazed tourists have even filmed the sphere's movement during previous earthquakes, which are a frequent occurrence on the island.

Taiwan is one country especially prone to earthquakes because it's close to where two tectonic plates meet – the Philippine Sea plate and the Eurasian plate.

Powerful seismic activity can be detected along the tectonic plate borders, where the plates rub up against each other, causing earthquakes.

However, Taiwan's earthquake preparedness is 'among the most advanced in the world', according to Stephen Gao, a seismologist and professor at Missouri University of Science and Technology.

'The island has implemented strict building codes, a world-class seismological network, and widespread public education campaigns on earthquake safety,' he said.

As of writing, Taiwan's strongest earthquake in 25 years has killed nine people, while another 50 are missing.

Rescuers expect the total number of injured and killed to rise as the hunt for people trapped by the quake continues.

The quake and aftershocks also caused 24 landslides and damage to 35 roads, bridges and tunnels, according to government statistics.

Taiwan's earthquake monitoring agency said the quake was a magnitude of 7.2, while the US Geological Survey (USGS) put it at 7.4.

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