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Response to William Seger (Reply #2)

Sat Feb 28, 2015, 03:56 AM

3. that list should be called...


"compilation of lists of sophistry to bore and not say shit about the WTC collapses!"

Don't think your link shows what you think it does! Al the links to so called sworn affidavits lead to a sign in page. So unless we're members...

This paper presents a qualitative assessment of the importance of gravity columns on the stability behavior of a typical mid-rise (10 story) steel building subjected to corner compartment fires. Two ten-story steel buildings with composite floor systems were designed following the design practices in the US. One of these buildings had perimeter moment resisting frames (MRFs) to resist lateral loads while the other building had an interior core of RC shear walls. Effects of gravity loads and fire conditions were simulated using the finite element method and numerical analysis techniques.

The results from the numerical investigations indicated that gravity columns govern the overall stability of building structures under fire conditions. Gravity columns have the highest utilization ratio, and they are most likely to reach their critical temperatures first. If gravity column failure occurs, the load shed or dropped by the failed column has to be redistributed to the neighboring columns to maintain overall structural stability. This axial load redistribution can occur through the development of alternate load paths including catenary action. Simulation results indicate that the presence of steel reinforcement in the concrete slabs (in addition to the minimum shrinkage reinforcement) facilitates uniform redistribution of the axial load dropped by the failed gravity column to the neighboring columns. The additional steel reinforcement improves the flexural and tensile strengths of the composite floor system, which enhances its ability to develop alternate load paths including catenary action in the slab, and thus maintain structural stability after gravity column failure."
nope doesn't say it there!


This paper reports on an investigation of the effects of fire on long span truss floor systems in a tall building environment. The effects of fire spread over multiple floors of a building are the focus of this research, especially where this may lead to progressive collapse. The results from an investigation of a two-dimensional model of a multistory office building analysis are presented. The model is representative of the type of construction used in the World Trade Center Towers 1 and 2. The local and global response of the model is described over the course of a concurrent fire on three floors reaching a peak compartment temperature of 800 degrees C. The results of the analysis show that large displacements may occur in long span structural floor systems without failure, however, the interaction of the highly deflected floors with the exterior or perimeter columns can lead to structural collapse. Additional structural members, such as hat trusses, that allow redistribution of loads away from the exterior columns to the core columns have a significant beneficial impact on the robustness of the structure."
again no!

you're good at sending someone on a wild goose chase but fail miserably in showing any evidence that buildings collapse from fire!

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nationalize the fed Feb 2015 OP
wildbilln864 Feb 2015 #1
William Seger Feb 2015 #2
LineLineNew Reply that list should be called...
wildbilln864 Feb 2015 #3
William Seger Feb 2015 #4
wildbilln864 Feb 2015 #5
nationalize the fed Feb 2015 #6
wildbilln864 Feb 2015 #7
William Seger Feb 2015 #8
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