Figure 1.4 WTC 7 tenants on September 11, 2001 (FEMA, 2002

from University of Alaska Building 7 Report

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Figure 1.4 WTC 7 tenants on September 11, 2001 (FEMA, 2002).

Following the disaster, many in the engineering community hypothesized that the collapse of WTC 7 was caused by some combination of debris impact damage from the collapse of WTC 1 and the fires that subsequently burned in WTC 7 until its collapse. Different variations of this hypothesis were advanced by two federal investigations: the first by the Federal Emergency Management Agency (FEMA), which issued its final report in May 2002, and the second by the National Institute of Standards and Technology (NIST), which issued its final

Figure 1.4 WTC 7 tenants on September 11, 2001 (FEMA, 2002

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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