Message - Re: The Price of Progress

    Responses | Architecture Forum | Architecture Students | Architecture Scrapbook | ArchitectureWeek    

Posted by  d on September 13, 2002 at 11:49:18:

In Reply to:  Re: The Price of Progress posted by Paul Dremann on September 13, 2002 at 10:20:54:

You might look back almost precisely one year to the trenchant observations of Ngon Nguyen on this forum, who pointed exactly in the direction that you are, to the defects of the damping system.
At that time, it seemed that the collapse was thus to a significant degree a result of either (or both) failure of the VED connections from mechanical separation or by melting....
However, I don't know that the comprehensive engineering analysis of the experts even mentioned these dampers as a partial cause.
Nevertheless, the general concern seems valid, and is a familiar situation to engineers.
The vast scale and sway of the buildings required flexibility at the connections; yet flexibility implies susceptibility to oxidation failure, whether slowly (as with the Mianus bridge collapse) or quickly (as may have been the case with the dampers).
As I saw it, the critical question was; would any large fire in the upper floors of the WTC (not just the actual attacks) have had the same tragic result? If so, then it would seem that the necessary redundancy was forgotten, ignored or delayed...
The Mianus bridge is sometimes mentioned as an example of the failure to provide redundancy at connections, with ledges etc.
Ngon Nguyen pointed out, in one of his postings, that had the rigid truss/wall connections been true hinges, the fracturing of the connection might have been avoided...
Is this the result of the long-term transformation of mechanical
connection (boltings, rivets, etc) to chemical forms of adhesion?
Should the two be used in tandem, to provide redundancy where critical
systems are connected?

ArchitectureWeek     Search     Buildings     Architects     Types     Places     Pix     Free 3D Models     Store     Library

Search by name of Building, Architect, or Place:   
Examples:  "Fallingwater",  "Wright",  "Paris"           Advanced Search


Post a Response -



This is an archive page. Please post continuing discussion to the new Architecture Forums.

To post successfully to the new membership-based DesignCommunity Forums:

    1) Go to the new forums area.
    2) Register with a valid email address.
    3) Receive and respond to the confirmation email.
    4) Then login to the new forum system.


Special thanks to our Sustaining Subscribers including .

Home | Great Buildings | CAD Outpost | DesignWorkshop | Free 3D | Gallery | Search | ArchitectureWeek
This document is provided for on-line viewing only. /discussion/21653.html