JL...
Vous ne savez même plus ce que vous écrivez
 Cela signifie que l’énergie cinétique au bas de l’immeuble, égale à l’énergie potentielle en l’absence de toute résistance, sera la moitié de ce qu’elle aurait été si toute la masse avait été concentrée en haut.
Energie cinétique divisée par deux, cela signifie que le carré de la vitesse acquise sera deux fois moins. (E=1/2 M*V*V)
La vitesse étant divisée par racine carrée de deux, le temps de chute sera multiplié par racine carré de deux puisque la vitesse acquise et le temps sont reliés par une fonction linéaire. Elémentaire.

C’est vous qui avez écrit ça ce n’est pas moi ... Donc la justification de votre racine de 2 vient pour vous du fait que le centre de gravité se situe à mi-hauteur.... Donc soit vous êtes complètement con soit vous le faites exprès... J’avoue que j’hésite entre les deux.

Manfred n’inversons pas les roles : c’est à vous de fournir des gens sérieux pour réouvrir une enquête... Vous voulez des gens qui soutiennent la version SCIENTIFIQUE des effondrements (et pas Gogovoyesque) ?

Eagar, T.W., & Musso, C. Why Did the World Trade Center Collapse ? Science, Engineering, and Speculation JOM v. 53 N°12 2001
Clifton, Charles G., Elaboration on Aspects of the Postulated Collapse of the World Trade Centre Twin Towers, Innovation in Metals 2001
Pinsker, Lisa, M. Applying Geology at the World Trade Center Site Geotimes v. 46, no. 11 2001
Zdenek P. Bazant, Yong Zhou Why Did the World Trade Center Collapse ? - Simple Analysis Journal of Engineering Mechanics v. 128 N°1 2002
Anne Powell Dissecting the Collapses Civil Engineering ASCE v. 72 N°5 2002
Quintiere, J.G. ; di Marzo, M. ; Becker, R. A suggested cause of the fire-induced collapse of the World Trade Towers, Fire Safety Journal v. 37 Issue 7 2002
Newland, D. E. ; Cebon, D. Could the world trade center have been modified to prevent its collapse ? Journal of Engineering Mechanics v. 128 Issue 7 2002
Monahan, B. World Trade Center Collapse-Civil Engineering Considerations Practice Periodical on Structural Design and Construction v. 7, no. 3 2002
Brannigan, F.L. WTC : Lightweight Steel and High-Rise Buildings Fire Engineering v.155 no. 4 2002
Fema Construction and Collapse Factors Fire Engineering v.155 no. 10 2002
Corbett, G.P. Learning and Applying the Lessons of the WTC Disaster Fire Engineering v.155 no. 10 2002
Norman J. Glover Collapse Lessons Fire Engineering v. 155 no. 10 2002
Burgess, I.W. Fire Resistance of Framed Buildings Physics Education v. 37 (5) 2002
Marechaux, T.G. TMS Hot Topic Symposium Examines WTC Collapse and Building Engineering JOM v. 54, no. 4 2002
Wierzbicki, T. ; Teng, X How the airplane wing cut through the exterior columns of the World Trade Center Journal of Impact Engineering v. 28 2003
Usmani, A. S. ; Chung, Y. C. ; Torero, J. L How did the WTC towers collapse ? A new theory Fire Safety Journal v. 38 2003
Gabrielson, T.B., Poese, M.E., & Atchley, A.A. Acoustic and Vibration Background Noise in the Collapsed Structure of the World Trade Center The Journal of Acoustical Society of America v. 113, no. 1 2003
Biederman, R.R., Sullivan, E.M., Sisson Jr., R.D., Vander Voort, Microstructural analysis of the steels from Buildings 7, & 1 or 2 from the World Trade Center Microscopy and Microanalysis v. 9 2003
Gayle, Frank W. ; Banovic, Stephen W. Tim. Foecke The Structural Steel of the World Trade Center Towers Advanced Materials & Processes v. 162 no10 2004
Nadine M. WTC Findings Uphold Structural Design ENR v. 253 no17 2004
Marjanishvili, S.M. Progressive analysis procedure for progressive collapse Journal of Performance of Constructed Facilities v. 18 (2) 2004
Corley, W.G. Lessons learned on improving resistance of buildings to terrorist attacks Journal of Performance of Constructed Facilities v. 18 (2) 2004
Zhou, Q., Yu, T.X. Use of high-efficiency energy absorbing device to arrest progressive collapse of tall building Journal of Engineering Mechanics v. 130 (10) 2004
Karim, Mohammed R. ; Fatt, Michelle S. Hoo Impact of the Boeing 767 Aircraft into the World Trade Center. Journal of Engineering Mechanics v. 131 Issue 10 2005
Usmani, A. S Stability of the World Trade Center Twin Towers Structural Frame in Multiple Floor Fires Journal of Engineering Mechanics v. 131 Issue 6 2005
Omika, Yukihiro. ; Fukuzawa, Eiji. Koshika, Norihide Structural Responses of World Trade Center under Aircraft Attacks Journal of Structural Engineering v. 131 no1 2005
Chang, Jeremy ; Buchanan, Andrew H. ; Moss, Peter J Effect of insulation on the fire behaviour of steel floor trusses Fire and Materials v.29 : 4 2005
Abolhassan, Genady P. Cherepanov September 11 And Fracture Mechanics, a Retrospective International Journal of Fracture v. 132 No. 2 2005
Baum, H.R., Rehm, R.G., Quintiere, J.G. A simple model of the World Trade Center fireball dynamics Proceedings of the Combustion Institute 2005
G. Flint, A.S. Usmani, S. Lamont, J. Torero and B. Lane, Effect of fire on composite long span truss floor systems Journal of Constructional Steel Research v. 62 (4) 2006
Gayle, F.W., Banovic, S.W., Foecke, T., Fields, R.J., Luecke, W.E., McColskey, J.D., McCown, C., Siewert, T.A. The structural steel of the World Trade Center towers Journal of Failure Analysis and Prevention v. 6 (5) 2006
Mohamed, O.A. Progressive collapse of structures : Annotated bibliography and comparison of codes and standards Journal of Performance of Constructed Facilities v. 20 (4) 2006
Zdenek P. Bazant, Mathieu Verdure Mechanics of Progressive Collapse : Learning from World Trade Center and Building Demolitions Journal of Engineering Mechanics v. 133 No. 3 2007
Banovic, S.W., Siewert, T.A. Failure of welded floor truss connections from the exterior wall during collapse of the world trade center towers Welding Journal v. 86 (9) 2007
Gayle, F.W. The collapse of the world trade center towers : A metallurgist’s view MRS Bulletin v. 32 (9) 2007
Hansen, B. Building code changes reflect world trade center investigation Civil Engineering v. 77 (9) 2007
Graeme Flint, Asif Usmani, Susan Lamont, Barbara Lane, and Jose Torero Structural Response of Tall Buildings to Multiple Floor Fires Journal of Structural Engineering v. 133 Issue 12 2007
Ayhan Irfanoglu, Christoph M. Hoffmann An Engineering Perspective of the Collapse of WTC-1, Journal of Performance of Constructed Facilities v. 22 No. 1 2008
Keith A. Seffen Progressive Collapse of the World Trade Centre : a Simple Analysis Journal of Engineering Mechanics v. 134 No. 2 2008
Zdenek P. Bazant, Jia-Liang Le, Frank R. Greening, David B. Benson What Did and Did not Cause Collapse of WTC Twin Towers in New York Journal of Engineering Mechanics v. 134 2008
Cherepanov, G.P. Collapse of towers as applied to September 11 events Materials Science v. 44 2008
Kuligowski, E.D., Mileti, D.S. Modeling pre-evacuation delay by occupants in World Trade Center Towers 1 and 2 on September 11 Fire Safety Journal 2008
Kodur, V.K.R. World Trade Center building disaster : Stimulus for innovations Indian Concrete Journal v. 82 2008
Ming Wang, Peter Chang, James Quintiere, and Andre Marshall Scale Modeling of the 96th Floor of World Trade Center Tower 1 Journal of Performance of Constructed Facilities v. 21 Issue 6
Genady P. Cherepanov Mechanics of the WTC collapse International Journal of Fracture v. 141 No. 1-2
B.A. Izzuddin, A.G. Vlassis, A.Y. Elghazouli, D.A. Nethercot Progressive collapse of multi-storey buildings due to sudden column loss — Part I : Simplified assessment framework Engineering Structures v. 30, Issue 5 2008
A.G. Vlassis, B.A. Izzuddin, A.Y. Elghazouli, D.A. Nethercot Progressive collapse of multi-storey buildings due to sudden column loss—Part II : Application Engineering Structures v. 30, Issue 5 2008
Jeom Kee Paik, Bong Ju Kim Progressive collapse analysis of thin-walled box columns Thin-Walled Structures v. 46, Issue 5 2008
Cheol-Ho Lee, Seonwoong Kim, Kyu-Hong Han, Kyungkoo Lee Simplified nonlinear progressive collapse analysis of welded steel moment frames Journal of Constructional Steel Research v. 65 Issue 5 2009
Feng Fu, Progressive collapse analysis of high-rise building with 3-D finite element modeling method Journal of Constructional Steel Research in press 2009
A.G. Vlassis, B.A. Izzuddin, A.Y. Elghazouli, D.A. Nethercot, Progressive collapse of multi-storey buildings due to failed floor impact Engineering Structures in press 2009
Santiago Pujol, J. Paul Smith-Pardo A new perspective on the effects of abrupt column removal Engineering Structures, v. 31, Issue 4 2009
Hyun-Su Kim, Jinkoo Kim, Da-Woon An Development of integrated system for progressive collapse analysis of building structures considering dynamic effects Advances in Engineering Software v.40, Issue 1 2009
Jinkoo Kim, Taewan Kim, Assessment of progressive collapse-resisting capacity of steel moment frames Journal of Constructional Steel Research v.65, Issue 1 2009
Lu Xinzheng, Jiang Jianjing Simulation for the Collapse of WTC after Aeroplane Impact International Conference on Protection of Structures 2002
Dr. Arden L. Bement, Jr. “Learning from 9/11 : Understanding the Collapse of the World Trade Center” Committee of Science House of Representatives 2002
Abboud, N., M. Levy, D. Tennant, J. Mould, H. Levine, S. King, C. Ekwueme, A. Jain, G. Hart. Anatomy of a Disaster : A Structural Investigation of the World Trade Center Collapses Third Congress on Forensic Engineering 2003
Beyler, C., D. White, M. Peatross, J. Trellis, S. Li, A. Luers, D. Hopkin Analysis of the Thermal Exposure in the Impact Areas of the World Trade Center Terrorist Attacks Third Congress on Forensic Engineering 2003
Thater, G. G. ; Panariello, G. F. ; Cuoco, D. A. World Trade Center Disaster : Damage/Debris Assessment Third Congress on Forensic Engineering 2003
Choi, S.K., Burgess, I.W. and Plank, R.J. The Behaviour of Lightweight Composite Floor Trusses in Fire Designing Structures for Fire 2003
Venkatash K. R. Kodur Role of fire resistance issues in the collapse of the Twin Towers International Conference on Tall Buildings 2003
Abolhassan Astaneh-Asl World Trade Center Collapse, Field Investigation and Analysis the Ninth Arab Structural Engineering Conference 2003
Mendonça, D., Lee II, E.E., Wallace, W.A. Impact of the 2001 World Trade Center attack on critical interdependent infrastructures IEEE International Conference on Systems 2004
Kuldeep Prasad and Howard R. Baum Coupled fire dynamics and thermal response of complex building structures Proceedings of the Combustion Institute 2005
Jowsey et all Determination of Fire Induced Collapse Mechanisms in Steel Framed Structures 4th European Conference on Steel and Composite Structures 2005
Usmani et all Collapse scenarios of WTC 1 & 2 with extension to generic tall buildings Congress on Fire Safety in Tall Buildings 2006
Marshall, A., Quintiere, J. A collective undergraduate class project reconstructing the September 11, 2001 world trade center fire ASEE Annual Conference and Exposition 2007
Pfatteicher, S.K.A « A new era » : The limits of engineering expertise in a post-9/11 world International Symposium on Technology and Society 2007
Razdolsky, L. Fire load in a steel building design 4th International Structural Engineering and Construction Conference 2008
Rini, D., Lamont, S. Performance based structural fire engineering for modern building design Structures Congress 2008

Où sont les votres ?? (Merci de ne pas m’opposer des théologiens ou philosophes mais des gens faisant du calcul de structure...)

Vous êtes un guignol Manfred et votre association avec Raynaud est prometteuse à souhait !!