Excerpt that mentions the reinforced-concrete core of each WTC tower: "I worked in downtown NY in the late 1960's when the towers were built! At lunch time we went to the construction site to watch the progress. And we saw them first buildt an internal thick walled rectangular concrete core inside which later the elevators ran. The steel work was erected around this core several floors behind!" ************************************************************ From: tomorle@postoffice.worldnet.att.net (Thomas) Newsgroups: alt.architecture,sci.energy,soc.history.medieval Subject: Re: World Trade Center collapse Message-ID: <3ba01ef2.11885093@news> References: <9nlp4k$eni$5@news.umbc.edu> < 69un7.285700$NK1.26585170@bin3.nnrp.aus1.giganews.com> X-Newsreader: Forte Free Agent 1.11/32.235 Lines: 13 Date: Thu, 13 Sep 2001 02:54:50 GMT NNTP-Posting-Host: 24.5.188.36 X-Complaints-To: abuse@home.net X-Trace: news1.rdc1.ga.home.com 1000349690 24.5.188.36 (Wed, 12 Sep 2001 19:54:50 PDT) NNTP-Posting-Date: Wed, 12 Sep 2001 19:54:50 PDT Organization: Excite@Home - The Leader in Broadband http://home.com/faster "Tony Jebson" wrote: >......Apparently, the WTC towers had no internal >structural columns but relied on the exterior structure for >support / strength. No doubt the impact of an airplane does >this no end of harm. I worked in downtown NY in the late 1960's when the towers were built! At lunch time we went to the construction site to watch the progress. And we saw them first buildt an internal thick walled rectangular concrete core inside which later the elevators ran. The steel work was erected around this core several floors behind! -=tom=-