Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Strategies & Market Trends : Mish's Global Economic Trend Analysis -- Ignore unavailable to you. Want to Upgrade?

To: sciAticA errAticA who wrote (51489)	5/18/2006 6:11:07 PM
From: sciAticA errAticA	Respond to of 116555

re: steel was apparently encased continued ---------- ... I'd further note that the structural steel core itself had very little in the way of flammable contents. The primary function of the core is to house elevators, bathrooms, and mechanical/electrical/plumbing/communications vertical service chases. ... fundamental to core construction is the use of shaftwall and firewall construction, as these areas are specifically designed to NOT allow fire, heat and smoke to travel between floors. ... the spaces surrounding the built-up steel core columns are the last place one would look for a hot fire...

To: sciAticA errAticA who wrote (51489)	5/18/2006 6:19:13 PM
From: regli	Respond to of 116555

Very interesting stuff. Thanks for the insight!

To: sciAticA errAticA who wrote (51489)	5/18/2006 6:25:03 PM
From: The Ox	Read Replies (1) \| Respond to of 116555

Isn't it possible that the combination of the impact of tons of airplane steel hitting the building at a couple of hundred miles per hour created what amounts to an "earthquake" where no earthquake would ever be expected by structural engineers. This impact of about 1000 tons hitting the building where no engineer would have ever expected (or tested, I assume), which not only created a huge cavity within the structure but also would have severely weakened all the surrounding floors from the force of the blow, and, combined with the resulting explosion from within the structure (adding even more weakness to the surrounding floors) did most of the damage. Maybe the resulting fire (which you seem to focus on) wasn't as responsible for the collapse as was this "mid-structure earthquake" which severely weakened the core skeleton. It appears to me that the fires aided in the final outcome but were not the main cause of the collapse. Once the collapse started, the pancaking appears to have been an inevitable result.