4.6 Results of Core Column/Exterior Column Failure Analysis

from University of Alaska Building 7 Report

2.6.2 ABAQUS Analysis

Figure 4.16 Dynamic analysis results showing the building tipping to the southeast after the hypothetical failure of Columns 76 to 81. The movement shown is highly amplified for clarity.

4.6 Results of Core Column/Exterior Column Failure Analysis

Finding that NIST’s scenario of horizontal progressive core column collapse was not feasible, and would not result in the observed straight-down collapse, we then simulated the simultaneous failure of all core columns over 8 stories followed 1.3 seconds later by the simultaneous failure of all exterior columns over 8 stories. Dynamic time history finite element analysis results for this simulation are shown in Figure 4.17, in which the simulation is presented side-by-side with two videos of the actual building collapse. The simulated collapse was examined in two different perspectives to match the perspectives of two different videos.

4.6 Results of Core Column/Exterior Column Failure Analysis

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2.6.2 ABAQUS Analysis

4.6 Results of Core Column/Exterior Column Failure Analysis

More articles from this publication:

2.6.2 ABAQUS Analysis

3.2.3 Lateral Support Beams Prevent Beam Buckling

2.6.1 SAP2000 Thermal Deformation Analysis

REFERENCES

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

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University of Alaska Building 7 Report