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![ANSYS finite element model of the 96th floor of WTC1, showing the short and long trusses that support the floor above](thumbnails/s61.jpg) |
![Diagram of the composite WTC floor system [from National Institute of Standards and Technology (NIST)]](thumbnails/s62.jpg) |
![Detailed 2005 analysis of the collapse of the World Trade Center Buildings 1 and 2 (WTC1 & WTC2) by the National Institute of Standards and Technology (NIST)](thumbnails/s63.jpg) |
![Multi-level](thumbnails/s64.jpg) |
![Multiple trusses supported each floor of the WTC buildings 1 & 2. See the diagrams 3 and 4 slides ago. (from the same 2005 NIST report as the previous 2 slides)](thumbnails/s65.jpg) |
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ANSYS finite element model of the 96th floor of WTC1, showing the short and long trusses that support the floor above |
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Diagram of the composite WTC floor system [from National Institute of Standards and Technology (NIST)] |
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Detailed 2005 analysis of the collapse of the World Trade Center Buildings 1 and 2 (WTC1 & WTC2) by the National Institute of Standards and Technology (NIST) |
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Multi-level "local-to-global" analyses of the collapse of WTC1 and WTC2 (from the same 2005 NIST report as the previous slide) |
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Multiple trusses supported each floor of the WTC buildings 1 & 2. See the diagrams 3 and 4 slides ago. (from the same 2005 NIST report as the previous 2 slides) |
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![Two models of failure of the floor trusses (from the same 2005 NIST report as the previous 3 slides)](thumbnails/s66.jpg) |
![Sagging and perhaps buckling of the very hot floor joists on the floors of one of the WTC buildings nearest the site of initial impact](thumbnails/s67.jpg) |
![ANSYS model of inward bowing of the south face of WTC 1 at 6000 seconds after initial impact: Floors 101 - 93](thumbnails/s68.jpg) |
![ANSYS model of inward bowing of the east face of WTC 2 in the neighborhood of the 80th floor at 2540 seconds after initial impact (This image is from the same source as that for the previous slide.)](thumbnails/s69.jpg) |
![(1) Region of initial impact; (2) Sagging of hot floor trusses causing inward deflection of columns of the perimeter wall; (3) collapse of one of the hot floors giving rise to impact of upper](thumbnails/s70.jpg) |
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Two models of failure of the floor trusses (from the same 2005 NIST report as the previous 3 slides) |
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Sagging and perhaps buckling of the very hot floor joists on the floors of one of the WTC buildings nearest the site of initial impact |
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ANSYS model of inward bowing of the south face of WTC 1 at 6000 seconds after initial impact: Floors 101 - 93 |
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ANSYS model of inward bowing of the east face of WTC 2 in the neighborhood of the 80th floor at 2540 seconds after initial impact (This image is from the same source as that for the previous slide.) |
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(1) Region of initial impact; (2) Sagging of hot floor trusses causing inward deflection of columns of the perimeter wall; (3) collapse of one of the hot floors giving rise to impact of upper "rigid" mass giving rise to column plastic hinge collapse; (4) progressive downward collapse |
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![Collapse of World Trade Center (WTC) Building 7 (WTC7) on September 11, 2001. WTC7, on fire, collapsed about 6 hours after the collapse of WTC1 and WTC2.](thumbnails/s71.jpg) |
![Terminal 2E of the Charles de Gaulle International Airport in Paris, France under construction. This and the next 7 slides show collapse of part of this huge shell-like building 30 months after construction.](thumbnails/s72.jpg) |
![Interior view of part of Terminal 2E of the Charles de Gaulle International Airport after completion](thumbnails/s73.jpg) |
![Terminal 2E of the Charles de Gaulle International Airport after completion and before local collapse](thumbnails/s74.jpg) |
![A schematic of Terminal 2E (opposite view from that in the previous slide), showing in red the portion that collapsed on May 23, 2004](thumbnails/s75.jpg) |
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Collapse of World Trade Center (WTC) Building 7 (WTC7) on September 11, 2001. WTC7, on fire, collapsed about 6 hours after the collapse of WTC1 and WTC2. |
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Terminal 2E of the Charles de Gaulle International Airport in Paris, France under construction. This and the next 7 slides show collapse of part of this huge shell-like building 30 months after construction. |
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Interior view of part of Terminal 2E of the Charles de Gaulle International Airport after completion |
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Terminal 2E of the Charles de Gaulle International Airport after completion and before local collapse |
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A schematic of Terminal 2E (opposite view from that in the previous slide), showing in red the portion that collapsed on May 23, 2004 |
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