Figure 2.29 Plan View: Model of floor slabs in strong direction (parallel to flutes

from University of Alaska Building 7 Report

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represents the floor slabs with the frame, shell, and solid elements. Both sides have the same width and length, and were subjected to the same loading conditions. To determine the equivalent homogeneous material to represent the floor slab, the deflection of the slabs made of the equivalent material should be the same as the composite floor slabs with frame, shell, and solid elements. Figures 2.29 and 2.30 below show the modeling of the floor slabs for the calculation of the equivalent material in another direction. That is, the floor slabs of WTC 7 had two directions. The direction in which the flutes ran had a higher resistance to bending. The orthogonal direction had a lower resistance to bending. Therefore, the equivalent homogeneous material was not isotropic. Figure 2.29 is a model of the stronger direction. Figure 2.30 is a model of the weaker direction.

Figure 2.29 Plan View: Model of floor slabs in strong direction (parallel to flutes).

Figure 2.29 Plan View: Model of floor slabs in strong direction (parallel to flutes

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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