daily menu » rate the banner | guess the city | one on oneforums map | privacy policy | DMCA | news magazine | posting guidelines

Go Back   SkyscraperCity > World Development News Forums > General Urban Developments > DN Archives



Global Announcement

As a general reminder, please respect others and respect copyrights. Go here to familiarize yourself with our posting policy.


Reply

 
Thread Tools
Old February 6th, 2010, 06:13 PM   #3081
GreenPeas
BANNED
 
GreenPeas's Avatar
 
Join Date: Aug 2006
Location: San Miguel, Manila
Posts: 225
Likes (Received): 3

Is it completely made of steel or is there a concrete core?

I can't see any concrete unlike in Guangzhou TV tower
GreenPeas no está en línea   Reply With Quote

Sponsored Links
Old February 6th, 2010, 07:29 PM   #3082
filipu94
Registered User
 
filipu94's Avatar
 
Join Date: Jul 2009
Location: London
Posts: 1,369
Likes (Received): 79

What's the big change since my last visit. Huge! Grow up..
filipu94 no está en línea   Reply With Quote
Old February 7th, 2010, 12:04 AM   #3083
elcid1911
Registered User
 
elcid1911's Avatar
 
Join Date: Oct 2007
Location: Lisbon
Posts: 1,000
Likes (Received): 17

It's getting massive!
__________________
Skyscrapercity Thread
Website
elcid1911 no está en línea   Reply With Quote
Old February 7th, 2010, 01:13 PM   #3084
CultureOfCongestion
Registered User
 
CultureOfCongestion's Avatar
 
Join Date: Oct 2009
Location: Paris,Tokyo
Posts: 84
Likes (Received): 1

Quote:
Originally Posted by Taller & Taller View Post
I think architects designed the structure to make it as flexible as possible in case of an earthquake (and that is why the tower is a 100% steel structure).
No! I checked on Nikken Sekkei Skytree web site ( who made the engineering work on this project) http://www.nikken.co.jp/ja/skytree/structure/ and the steel work is definitely very stiff, using high resistance steel, twice as efficient as ordinary steel used for construction.
Also the scale of the differents elements is impressive, for example the collumn parts at the base are 2.3m in diameter and 10cm thick.
Look at these diagrams of the steel work, pretty simple but very efficient to resist loads in all directions (red parts are the most important)

Copyright Nikken Sekkei

But I was wrong about the Core, I though it has no structural purpose, but in fact it serves as a counterweigh to the main structure (I think it's called a mass damper) check this graph:

Copyright Nikken Sekkei

As you can see on this diagram, the only flexibility is between the core and the main structure linked by oil dampers from 125m to 375m. (Dampers are red pieces on the plan)

Copyright Nikken Sekkei

Otherwise it's just a matter of stiffness, because a too much flexible (or ductile) structure would shake too much with a risk of collapsing in case of very strong wind or earthquake.
CultureOfCongestion no está en línea   Reply With Quote
Old February 7th, 2010, 04:01 PM   #3085
Ahmad Rashid Ahmad
Sapphire
 
Ahmad Rashid Ahmad's Avatar
 
Join Date: Oct 2008
Location: Madinah - Lahore
Posts: 15,443
Likes (Received): 6165

Nice pics........
Ahmad Rashid Ahmad no está en línea   Reply With Quote
Old February 7th, 2010, 04:21 PM   #3086
Taller & Taller
AKA Whynottaller
 
Taller & Taller's Avatar
 
Join Date: Jan 2007
Posts: 246
Likes (Received): 19

Quote:
Originally Posted by CultureOfCongestion View Post
No!

[...]

Otherwise it's just a matter of stiffness, because a too much flexible (or ductile) structure would shake too much with a risk of collapsing in case of very strong wind or earthquake.
It is not just a matter of stiffness. Of course the structure has to be stiff enough to stay stable. But, it is very important for its integrity to be able to absorb much of the energy induced on it by an earthquake (and other forces) without crumbling. And, for that purpose, there is nothing like steel (way better than concrete).

So, again, I guess that's why this is a 100% steel tower (and that's why other all-steel towers, not many, have half the height TST has).

PD. Thanks for all the information.
Taller & Taller no está en línea   Reply With Quote
Old February 7th, 2010, 04:23 PM   #3087
corredor06
BANNED
 
Join Date: Oct 2008
Location: Panama City
Posts: 968
Likes (Received): 31

nice tower
corredor06 no está en línea   Reply With Quote
Old February 7th, 2010, 05:03 PM   #3088
tommyzion
Registered User
 
Join Date: Oct 2007
Posts: 125
Likes (Received): 25

Hello!

Sky Tree of Sunset. (Mt.Fuji and sun , Skytree tower)

Please look the movie..
http://www.youtube.com/watch?v=5R_4TGF9AZo


Last edited by tommyzion; February 7th, 2010 at 11:02 PM.
tommyzion no está en línea   Reply With Quote
Old February 7th, 2010, 05:20 PM   #3089
CultureOfCongestion
Registered User
 
CultureOfCongestion's Avatar
 
Join Date: Oct 2009
Location: Paris,Tokyo
Posts: 84
Likes (Received): 1

Quote:
Originally Posted by Taller & Taller View Post
It is not just a matter of stiffness. Of course the structure has to be stiff enough to stay stable. But, it is very important for its integrity to be able to absorb much of the energy induced on it by an earthquake (and other forces) without crumbling.
I agreed on this point of course, but in the case of Skytree this energy is absorbed by the counterbalancement of the core and the oil dampers at first, and not so much by the steel work itself (but a little for sure, since there is no passive structure)
Anyway I hope the other forumers who ask about the ability of this tower to resist against earthquake will read our posts

Quote:
Originally Posted by Taller & Taller View Post
And, for that purpose, there is nothing like steel (way better than concrete).
PD. Thanks for all the information.
You are welcome! but do not underestimate reinforced concrete, it has many different types and can be ductile or stiff as well (this depend also of the type of steel rebars used)
There is no perfect structure, the point is to find the best combination based on each situations.

Regards
CultureOfCongestion no está en línea   Reply With Quote
Old February 7th, 2010, 08:03 PM   #3090
Taller & Taller
AKA Whynottaller
 
Taller & Taller's Avatar
 
Join Date: Jan 2007
Posts: 246
Likes (Received): 19

Quote:
Originally Posted by CultureOfCongestion View Post
You are welcome! but do not underestimate reinforced concrete, it has many different types and can be ductile or stiff as well (this depend also of the type of steel rebars used)
There is no perfect structure, the point is to find the best combination based on each situations.

Regards
Actually, prestressed concrete (like in the CN Tower) would face a tremor better than just reinforced concrete.

- Reinforced concrete structures:



Taller & Taller no está en línea   Reply With Quote
Old February 7th, 2010, 09:34 PM   #3091
Taller & Taller
AKA Whynottaller
 
Taller & Taller's Avatar
 
Join Date: Jan 2007
Posts: 246
Likes (Received): 19

Here is a Japan Seismic Hazard Map:


Taller & Taller no está en línea   Reply With Quote
Old February 7th, 2010, 10:16 PM   #3092
D.D.
BANNED
 
Join Date: Nov 2007
Posts: 2,410
Likes (Received): 39

Quote:
Originally Posted by Momo1435 View Post

a-nobusan.cocolog-nifty.com/blog/
wow looking a the central core of the tower I can see how complex the whole structure is...What a marvel.
D.D. no está en línea   Reply With Quote
Old February 7th, 2010, 10:31 PM   #3093
bamz..
Registered User
 
bamz..'s Avatar
 
Join Date: Jun 2009
Location: Jakarta
Posts: 863
Likes (Received): 14

Tokyo Roooooooooooooooocks !
bamz.. no está en línea   Reply With Quote
Old February 8th, 2010, 03:16 AM   #3094
VRS
Registered User
 
VRS's Avatar
 
Join Date: Jun 2006
Location: Jakarta
Posts: 46,752
Likes (Received): 11521

very--very --- impressive picture,this is will be new icon for tokyo...
VRS no está en línea   Reply With Quote
Old February 8th, 2010, 04:28 AM   #3095
Parisian Girl
MONACO _ Côte d'Azur
 
Parisian Girl's Avatar
 
Join Date: Nov 2007
Location: PARIS - Monte Carlo - London
Posts: 16,678
Likes (Received): 2829

Another few weeks and this tower should be about half way there I'd say.
__________________
Je m'appelle Paris
Parisian Girl no está en línea   Reply With Quote
Old February 8th, 2010, 07:12 AM   #3096
Momo1435
-----アンジュルム-----
 
Momo1435's Avatar
 
Join Date: Oct 2005
Location: アルフェナンデンライン
Posts: 34,598
Likes (Received): 61109

New Week, new growth




tokyo-sky-tree.seesaa.net/
__________________
Support your Idols
キタ ━━━━━━━━━━━━━━━━ ฅ(๑⊙д⊙๑)ฅ!! ━━━━━━━━━━━━━━━━!!!
Japan Projects & Construction
Momo1435 no está en línea   Reply With Quote
Old February 8th, 2010, 07:23 PM   #3097
quashlo
Registered User
 
Join Date: Jun 2008
Posts: 14,835
Likes (Received): 3215

Visiting the site by train



Construction site tour by bike

quashlo no está en línea   Reply With Quote
Old February 8th, 2010, 11:33 PM   #3098
venom6
Registered User
 
venom6's Avatar
 
Join Date: Dec 2008
Location: BUD-VIE
Posts: 3,154
Likes (Received): 1302

Great videos! Thank you very much for sharing them with us!
__________________
Metro 1 | Metro 2 | Metro 3 | Metro 4 | Metro 5
venom6 no está en línea   Reply With Quote
Old February 9th, 2010, 03:40 AM   #3099
VRS
Registered User
 
VRS's Avatar
 
Join Date: Jun 2006
Location: Jakarta
Posts: 46,752
Likes (Received): 11521

tower of the future...
VRS no está en línea   Reply With Quote
Old February 9th, 2010, 08:43 AM   #3100
Momo1435
-----アンジュルム-----
 
Momo1435's Avatar
 
Join Date: Oct 2005
Location: アルフェナンデンライン
Posts: 34,598
Likes (Received): 61109

02/09

[IMG]http://i47.************/11u98w9.jpg[/IMG]
tokyo-sky-tree.seesaa.net/

Tobu HQ demolition update (02/08)

[IMG]http://i45.************/153xvtu.jpg[/IMG]

[IMG]http://i48.************/1zgxhsj.jpg[/IMG]

[IMG]http://i49.************/14tm046.jpg[/IMG]
ameblo.jp/tokyo-skytree-blog/

Canal works update (02/08)

[IMG]http://i45.************/a48qcn.jpg[/IMG]

[IMG]http://i48.************/ao42vo.jpg[/IMG]
ameblo.jp/tokyo-skytree-blog/
__________________
Support your Idols
キタ ━━━━━━━━━━━━━━━━ ฅ(๑⊙д⊙๑)ฅ!! ━━━━━━━━━━━━━━━━!!!
Japan Projects & Construction
Momo1435 no está en línea   Reply With Quote


Reply

Tags
hypertall, supertall, tokyo, tokyo sky tree

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Related topics on SkyscraperCity


All times are GMT +2. The time now is 06:53 AM.


Powered by vBulletin® Version 3.8.11 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions Inc.
Feedback Buttons provided by Advanced Post Thanks / Like (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

SkyscraperCity ☆ In Urbanity We trust ☆ about us | privacy policy | DMCA policy

Hosted by Blacksun, dedicated to this site too!
Forum server management by DaiTengu