[TowerTalk] [Bulk] VOA tower demolition in HD

[Henk PA5KT]

An example of a not controlled tower failure.
https://www.youtube.com/watch?v=ty0CITiZY7E

The guy wires still keep everytihng close to the tower.

Henk PA5KT

Op 4/7/2016 om 4:09 AM schreef Grant Saviers:
> It depends on the strength of the tower.  A classic brick chimney 
> almost always breaks into two or more parts.  The reason is the top 
> has to accelerate faster than the bottom for the chimney/tower to stay 
> straight, i.e. for all parts contact the ground at the same time since 
> the top has more distance to cover.  Since gravity is a uniform 
> acceleration force, the tower/chimney bends instead as the top lags 
> behind.  For brick chimneys there is little strength in tension and 
> they come apart.  For a steel tower and perhaps reinforced concrete 
> chimneys, they may be strong enough to only bend or kink.  I saw first 
> hand the result of a 100' steel pipe flagpole failure at its base, and 
> it did break before hitting the ground.  I missed the actual fall by 5 
> minutes, which was mighty good luck.  It bounced off the ground and 
> meat cleavered two cars almost in half lengthwise.
>
> A different kind of failure is a pancake collapse, which is what 
> happened in the World Trade Center terrorist attack.  If a middle or 
> bottom floor support fails, the now kinetic energy of the structure 
> above pancake collapses the entire structure more or less straight 
> down.  So if demolition charges take out say 20' of tower legs, the 
> whole thing might pancake on itself, since the compression strength of 
> the tower legs are exceeded by the momentum of the structure above.
>
> Grant KZ1W
>
>
>
> On 4/6/2016 16:58 PM, Kathy Bookmiller via TowerTalk wrote:
>> Probably many of you have already seen this, but this is a HD version 
>> with more views of the tower demolition.
>> I have one question. I've always heard that when a really tall tower 
>> comes down, it basically collapses onto itself and doesn't fall as 
>> one solid unit extending out the height of the tower. Watching this, 
>> I see many of the towers didn't collapse into one small area but went 
>> down as a full unit.
>> Kathy
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk at contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk