How tall is too tall? Building the World’s tallest skyscraper.

The world’s current tallest skyscraper is the Burj Khalifa in Dubai. It’s 828 metres tall, which is over two-and-a-half times as tall as any skyscraper in Australia.

However, there is a skyscraper being built in Jeddah, Saudi Arabia, that will be over 1,000 metres tall when it’s finished. This will be the first building to ever rise over a kilometre high. It will also have 167 floors on top of each other!

So, how tall could we build a skyscraper? It would be difficult, but we could probably build a tower over 2,000 metres tall, which would be like ten normal skyscrapers on top of each other!

This is probably not a very good idea though. Building such a mega-tall skyscraper would use a huge amount of concrete and steel. Using lots of these materials when we don’t need to can be bad for the environment. It’s usually much better for the environment if we build smaller skyscrapers, maybe up to 300 metres tall.

Challenges for mega tall skyscrapers

The biggest difficulty is the wind. It blows on a skyscraper and tries to push it over, so you need to design a structure that keeps the building stable. The wind can also make a tower sway from side to side, so that people at the very top can even feel seasick.

Architects and engineers have lots of technologies to help stop this. Some of the tallest skyscrapers in the world have a giant pendulum at the top, inside the building, called a “tuned mass damper”.

The 660 tonnes steel pendulum that serves as a tuned mass damper; at a cost of US$4 million. Suspended from the 92nd to the 87th floor, the pendulum sways to offset movements caused by the wind. The largest damper in the world, it consists of 41 circular steel plates, each a height of 125 mm and welded together to form a 5.5 m diameter sphere.

How the lift works in the tallest building?

Another big challenge is how do you get to the top of a building that is one kilometer tall?

Some of these lifts can travel at 70km/h, the speed of cars on a highway, however, in this case of extreme heights elevators are made to move at a speed lower than ordinary lifts to avoid nausea due to the change in air pressure.

The Jeddah Tower will have 59 of them! They will have super-strong carbon fibre ropes to carry the lift, as normal ropes just aren’t strong enough.

 

Facts about Jeddah Tower

The Designer

The designing architect of the world’s first 1-kilometer high skyscraper is none other than Adrian Smith, from Adrian Smith + Gordon Gill Architecture. Smith was also the designer of the world’s current tallest building, Burj Khalifa in Dubai, and he is, generally, known for his soaring towers in the US, South Korea, and China.

With a budget nearing $2 billion, its opening date was pushed till 2020 due to difficult economic circumstances in the country.

Shape

The aerodynamic triangular shape and the sloping exterior of the Jeddah Kingdom Tower help in reducing the wind load. Its tri-petal-shaped plan is inspired by the leaves of desert plants.

The Hotel

The multi-use tower will house the Four Seasons Hotel in addition to serviced residential apartments and office spaces, with transportation routes all around it.

Observatory deck

Jeddah Tower will have the highest observatory deck and hanging balcony, about 652 meters above the sea level.

Lifts

Kingdom Tower Jeddah will have 59 elevators. However, due to the extreme height of the tower, which is over one kilometer, elevators are made to move at a speed lower than ordinary lifts to avoid nausea due to the change in air pressure.

Outdoor terraces

Wonderful views of the city and the sea can be seen from the outdoor terraces. The three-sided building has magnificent patios as well as shaded pockets in each of the three sides.

Structure weight

A structure of such height requires a huge amount of steel for construction which can reach up to 80,000 tons.

*source Arch20 

*source Property Observer

 

Posted in Latest news, News on 30th May, 2019