Figure E.3 Finite Element Model of WTC7 in SAP2000, as viewed from the south

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behavior observed in videos of the collapse. The collapse could have started at Floor 16 and below and produced the same behavior (Section 4.6).

It is our conclusion based upon these findings that the collapse of WTC 7 was a global failure involving the near-simultaneous failure of all columns in the building and not a progressive collapse involving the sequential failure of columns throughout the building.

Figure E.3 Finite Element Model of WTC 7 in SAP2000, as viewed from the south.

Figure E.3 Finite Element Model of WTC7 in SAP2000, as viewed from the south

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Figure 4.20 Velocity comparison between Chandler measurement (green plotted line) and UAF simulation (red plotted line). Bold green trend line illustrates free fall

Figure 4.17 (a) Comparison of simulated collapse to perspective 1; (b) comparison of simulated collapse to perspective 2

2.7 Summary and Conclusion

3.2.2 Girder A2001 Web Stiffeners Prevent Flange Failure and Girder Walk-off

Table 2.3 Comparison of UAF and NIST Modeling

4.6 Results of Core Column/Exterior Column Failure Analysis

2.6.2 ABAQUS Analysis

3.2.3 Lateral Support Beams Prevent Beam Buckling

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University of Alaska Building 7 Report