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The CN Tower
Construction – what are the key features of this building? 
It’s location – is it at risk from exterior dangers (earthquakes, weather etc…) 
Centre of mass – This is the important one, WHY and HOW has it been designed with the centre of mass in mind

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The CN Tower is a tower in Toronto, Canada. It has been the highest tower ever built for 30 years and it is one of the icons of the city.
Probably the key feature of the building are the post-tension cables, post-tension cable on the CN tower will last 300 years, because  they are the only components that can’t be replaced so if corrosion happens, the tower must be demolished.

“The tower was designed to withstand the impact of a Boeing 707, earthquakes, fires, lightning strikes and more than 200 km/h winds” 
Bud Purves (CN tower president) said.
Experts says that if a plane would collapse against the tower, it would just shred apart because the construction has over 450 tonnes of reinforcing steel in the concrete.

The cn tower is hollow concrete structure so it  is flexible during high winds the glass floored deck near the top would move, this movement press the special shaped foundation more firmly into the ground

Since the Cn tower has a large base and a small top the centre of gravity is low. This is because more of the weight is at the bottom. Having a low centre of gravity is important because the lower the centre of gravity, the more stable the structure is.
Internal: compression, tension and gravity,
External: Wind, Weight, and Gravity.

Post-tension cable on the CN tower will last 300 years, because  they are the only components that can’t be replaced so if corrosion happens, the tower must be demolished. 

If the CN Tower would fall it would do it basically in place. Wouldn’t topple over like a stick because concrete simply wouldn’t be able to shear forces for that.
Although the top of the CN Tower, from the Sky Pod on up is all steel, not concrete. But that’s only 75m of the total height.
It has a significant purpose that, without it, the tower would be thrown into tension under high winds and would fall down
The base of the tower is more than 12 meters below ground and since that the tower is so massive and heavy and its centre of gravity is low (61 from the ground) it has a great stability.

Wind resistance — Like all tall, narrow buildings, the Tower sways in extreme wind conditions but it can withstand winds of up to 260 mph (418 kph) and two ten-ton swinging counterparts, mounted on the antenna, ensure that it never exceeds acceptable conditions. The
 armour-plated windows on the observation levels and restaurant were carefully designed for extreme wind tolerance with outside panes of 95 cm thickness and inside panes of 64 cm thickness.

“The tower was designed to withstand the impact of a Boeing 707, earthquakes, fires, lightning strikes and more than 200 km/h winds” 
Bud Purves (CN tower president) said.
Experts says that if a plane would collapse against the tower, it would just shred apart because the construction has over 450 tonnes of reinforcing steel in the concrete

https://www.ieee.ca/millennium/cntower/CN_Tower.pdf
https://www.thestar.com/news/gta/2014/02/23/cn_tower_built_to_last.html
https://www.theglobeandmail.com/news/national/plotters-beware-dont-mess-with-the-cn-tower/article22500819/

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