Figure 2.24 Column number layout of Floor 13 (NIST, 2008, NCSTAR 1A

from University of Alaska Building 7 Report

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The loading condition for the Floor 12 and 13 assembly was calculated by imposing axial forces acting on the top of Floor 13. The column number sequence is shown in Figure 2.24 (NIST, 2008, NCSTAR 1A).

The axial force acting on each column is given in Table 2.1. The loading for Column 79 is highlighted in the table because NIST concluded that the collapse of Column 79 at Floor 13 initiated the building’s progressive collapse (NIST, 2008, NCSTAR 1A).

Figure 2.24 Column number layout of Floor 13 (NIST, 2008, NCSTAR 1A).

Figure 2.24 Column number layout of Floor 13 (NIST, 2008, NCSTAR 1A

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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