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 : The Residential Real Estate Crash Index -- Ignore unavailable to you. Want to Upgrade?

To: alanrs who wrote (229260)	11/18/2009 12:13:12 AM
From: arun gera	Read Replies (1) \| Respond to of 306849

>Get the prints, add up all the weight above those floors. Once floor beams start cutting loose you've got a shock load situation that would be highly unlikely to have been engineered into the design.> This is the crucial tipping point. How much is the difference in impact of and resistance to shock load versus static load? As such the steel columns on lower floors unaffected by high temperatures would have been capable of bearing the static load, because they had always borne the load, and usually are designed to bear many times the load above them. -Arun

To: alanrs who wrote (229260)	11/18/2009 7:41:55 AM
From: Think4Yourself	Read Replies (2) \| Respond to of 306849

The beams are covered with concrete, which both protects them and dramatically strengthens them. The concrete expanded and cracked off when it experienced thermal expansion from the intense heat. The steel heated up, which weakened it. Once the first floor failed, the massive impulse from tons of material falling 10 feet guaranteed every other floor was going to fail. The delay between the start of the fire and the collapse was because the above didn't happen instantaneously. From an engineering standpoint the sequence of events was totally predictable. The only thing I found interesting is the small footprint of the rubble. It appears the core was responsible for this. A number of supposed engineers went on TV and said all this couldn't happen. I suspect all those incompetent buffoons couldn't calculate a simple integral and are now unemployed.