www.sefindia.org

STRUCTURAL ENGINEERING FORUM OF INDIA [SEFI]

 Forum SubscriptionsSubscriptions DigestDigest Preferences   FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups  RegisterRegister FAQSecurity Tips FAQDonate
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log in to websiteLog in to websiteLog in to websiteLog in to forum 
Warning: Make sure you scan the downloaded attachment with updated antivirus tools  before opening them. They may contain viruses.
Use online scanners
here and here to upload downloaded attachment to check for safety.

Daily Digest Tue Sep 21 23:00:03 2004

 
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies.    www.sefindia.org Forum Index -> Past Discussions Year 2004
View previous topic :: View next topic  
Author Message
ibarua
General Sponsor
General Sponsor


Joined: 26 Jan 2003
Posts: 1039

PostPosted: Wed Sep 22, 2004 1:31 am    Post subject: Daily Digest Tue Sep 21 23:00:03 2004 Reply with quote

22 Setember, 2004

Re.: Structural Safety -- WTC disaster on 9/11

The observations made by Sikandar Hayat Siddiqi about the defects in the structural design and safety management of WTC are ridiculous, to say the least. Can anyone design and /or construct a building or a structure to withstand the impact of a high speed object the size of a Boeing 747 aircraft loaded with tons of highly combustible fuel? Temperatures after the impact are said to have reached over 4,500 deg. F, and the steel trusses /beams supporting the floors simply melted in the tremendous heat generated by the explosion of aviation fuel vapour.

Can we have earthquake proof buildings? I think not. Society will never pay the price. But what we can have are earthquake resistant buildings. If, after an earthquake, the occupants can walk away to safety, then the architect, the structural designer and the construction team have all done their job well.

That not all the occupants of the WTC towers were killed outright on 9/11 is itself a miracle and shows that the buildings had good standards of design and construction.

Indrajit Barua
uwahati, Assam.
On Tue, 21 Sep 2004 general@sefindia.org wrote :
[quote]---------------------------------------------------------

Posted via Email
Back to top
View user's profile Send private message
JVCSNL
...
...


Joined: 26 Jan 2003
Posts: 159

PostPosted: Wed Sep 22, 2004 4:50 am    Post subject: Daily Digest Tue Sep 21 23:00:03 2004 Reply with quote

Gentlemen,

I would like to bring to your notice that after 9/11 tragedy, FEMA
conducted a study on many aspects of building design.  I guess, WTC
Study report (in PDF format) is still available on FEMA website.  It
would be wise to go through the report and get ourselves educated
regarding the design criteria and performance characteristics.  

I would like to put an excert from the report apart from some already
highlighted by Ashwin regarding the building performance.  

"WTC Towers were the first structures outside of the military and the
nuclear industries whose design considered the impact of a jet airliner,
the Boeing 707."  (Ch.1)  Further, the details of the aircraft loading
and impact is also explained here.  Also, a pictorial comparison of
different old and new generation aircrafts with the Boeing
767-200ER(which struck the WTC) is worth knowing.

Many other aspects were studied and presented in the report.  I am sure
reading the report will certainly clarify many misconceptions.  

Regards,

Jignesh





Quote:
Quote:
Quote:
ibarua@deguild.com 22-09-2004 >>>

22 Setember, 2004

Re.: Structural Safety -- WTC disaster on 9/11

The observations made by Sikandar Hayat Siddiqi about the defects in
the structural design and safety management of WTC are ridiculous, to
say the least. Can anyone design and /or construct a building or a
structure to withstand the impact of a high speed object the size of a
Boeing 747 aircraft loaded with tons of highly combustible fuel?
Temperatures after the impact are said to have reached over 4,500 deg.
F, and the steel trusses /beams supporting the floors simply melted in
the tremendous heat generated by the explosion of aviation fuel vapour.


Can we have earthquake proof buildings? I think not. Society will never
pay the price. But what we can have are earthquake resistant buildings.
If, after an earthquake, the occupants can walk away to safety, then the
architect, the structural designer and the construction team have all
done their job well.

That not all the occupants of the WTC towers were killed outright on
9/11 is itself a miracle and shows that the buildings had good standards
of design and construction.

Indrajit Barua
uwahati, Assam.
On Tue, 21 Sep 2004 general@sefindia.org wrote :
[quote]---------------------------------------------------------

Posted via Email
Back to top
View user's profile Send private message
Display posts from previous:   
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies.    www.sefindia.org Forum Index -> Past Discussions Year 2004 All times are GMT
Page 1 of 1

 

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum


© 2003, 2008 SEFINDIA, Indian Domain Registration
Publishing or acceptance of an advertisement is neither a guarantee nor endorsement of the advertiser's product or service. advertisement policy