I had to buy online the pretty expensive PDF to this article, so I would love to pass it on to anyone who wants a copy. Just email me if you're interested.

Source: http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000133000003000308000001&idtype=cvips&gifs=Yes

Mechanics of Progressive Collapse: Learning from World Trade Center and Building Demolitions

J. Engrg. Mech., Volume 133, Issue 3, pp. 308-319 (March 2007)

Zdenek P. Bažant,1 F.ASCE and Mathieu Verdure2

1McCormick School Professor and W.P. Murphy Professor of Civil Engineering and Materials Science, Northwestern Univ., 2145 Sheridan Rd., CEE/A135, Evanston, IL 60208. E-mail: z-bazant@northwestern.edu

2Visiting Fellow, Northwestern Univ., 2145 Sheridan Rd., CEE/A135, Evanston, IL 60208; on leave from Ecole Polytechnique, Palaiseau, France.

(Accepted 16 September 2006)