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

To: arun gera who wrote (229265)	11/18/2009 7:14:43 AM
From: alanrs	Read Replies (1) \| Respond to of 306849

"This is the crucial tipping point. How much is the difference in impact of and resistance to shock load versus static load?" All stuff I don't know, not being an engineer, just a dumb ironworker. One would have to know the size and number of bolts or the amount of weld to get an idea of the shear they could withstand. It would take a computer generated model and even then it would be a guess as to what broke loose first and how the force was transfered. The core itself is a rather heavy chunk of concrete (strong in compression, weak in tension) and if the floor beams failed in such a way as to apply sideways tension on that core causing it to crack..... Not hard to envision the core collapsing taking everything with it. While there's no way I could know what the puffs of smoke on lower floors are, I'm sure the columns were welded at the splice points and the torque applied above could translate into these breaking or blowing out the concrete floors around them, or snapping whatever was used to attach the skin to the building. All that is a much more direct explanation than a demolition team at the ready streaming up darkened stairways against traffic, or pre-planted explosives with advanced knowledge. IMO. ARS