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'Perfect Storm' Caused Fractures at San Francisco Transit Hub.

 
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VPandya
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Joined: 09 Nov 2009
Posts: 774
Location: Ahmedabad

PostPosted: Tue Jan 01, 2019 4:27 am    Post subject: 'Perfect Storm' Caused Fractures at San Francisco Transit Hub. Reply with quote

Dear Sefi Engrs.,

Perfact Storm caused failure of Long Span Steel Girders in San Francisco, CA , USA,   Transit Hub.

Salesforce's cracked beams linked to unfortunate trifecta of issues
An independent review panel concluded that low fracture toughness, load-oriented stress and cracks related to steel fabrication played a role in the beam cracks at the Salesforce Transit Center in San Francisco. Questions are being raised as to whether design codes need to be changed when constructing certain long-span steel structures.
Web-Link :  
Engineering News--Record (12/26)  
Code Changes Required ?

Regards .
Vasudeo Pandya  P.E.
Structural Engineer  


Last edited by VPandya on Thu Jan 03, 2019 4:06 am; edited 1 time in total
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Dipyaman_Ghosh
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Joined: 19 Jun 2012
Posts: 10

PostPosted: Wed Jan 02, 2019 6:04 am    Post subject: Code change requiireement Reply with quote

Dear Sir,

On the topic of the link sent,
first of all I must say it seems a detailed explanation is definitely required, I am skeptic whether a news report is going to be very conclusive or not.
Secondly, I think that rather than going for a code change on an immediate major damage, or until a code change is even suggested officially, the design revision for long span beams should be in hands of expert engineers's decision.
Thirdly, on practical terms, a code change can be suggested unfortunately under two bad conditions - a) a series of misfortunate incidents happening of which no existing normal concepts are unable to explain the damage and b) a really mass scale level misfortunate incident that gets called on a national or perhaps even a global scale. Before these conditions, it is also practically impossible to gain approval of any major and concerned authority to sign on a blank cheque to allow code changes ( mostly which would be based on prediction ).  

On point (a) we need to discuss on how many events needs to be quantified to qualify as a series of incidents? meaning - does 5 incidents concur as series of incidents? or 4 ? or 3? how many.
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VPandya
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Posts: 774
Location: Ahmedabad

PostPosted: Wed Jan 02, 2019 6:14 pm    Post subject: We need more detailed report from a firm like WJE . Reply with quote

Dear Engr.  Dipyaman_Ghosh,

I agree with you that we need a more detailed report on cause of Failure of this San Francisco TRANSIT  HUB SHUTDOWN,  because of cracks in Long Span steel Girders .  Code changes  is a very elaborate process and  is  done by AISC code committee experts .   Because of  litigations  ( Court Cases )  I suggest a typical way of doing things in USA .

HIRE  A FAILURE INVESTIGATING FIRM LIKE  WJE ( WISS , JANNEY , ELSTENER ( WJE ) ASSOCIATES  , INC. and for sure find out where the problem is ?  This firm is a very reputed firm and has done many big and small failure investigations .   Their company web-site :

Wiss, Janney, Elstner Associates, Inc. (WJE)  :


https://www.wje.com/about


Regards.


Vasudeo Pandya  P.E.
Structural Engineer


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Dipyaman_Ghosh
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Joined: 19 Jun 2012
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PostPosted: Thu Jan 03, 2019 5:05 am    Post subject: Reply with quote

The update has been interesting. Let's see what does the eventual investigation reveals in the near future. If a major incident can call for a major authority to revise a major standard...Hope is still out there to have accommodating code changes to prevent major damages.
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