This has a very good engineering explanation of how the columns failed.the demolition performed on the World Trade towers was way beyond normal demolition. The demolition performed on WTC building #7 was normal demolition, where the skyscraper is folded up and dumped into it's footprint... but the demolition of the towers went far beyond normal demolition, which would have left an impossible pile of rubble some 15-20 stories high... the demolition on the towers literally pulverized into dust everything but the steel... 90% of the towers either floated off into the air or poured out onto the streets of Manhattan... leaving only 1-2 stories of rubble to clean up.
https://www4.bing.com/videos/search?q=wtc7+debunked&&view=detail&mid=331F74E520E09747C160331F74E520E09747C160&&FORM=VDRVRV
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