It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Possible options for developing cost-effective fixes include:
More robust connections and framing systems to better resist effects of thermal expansion on the structural system.
Structural systems expressly designed to prevent progressive collapse, which is the spread of local damage from a single initiating event, from element to element, eventually resulting in the collapse of an entire structure or a disproportionately large part of it. Current model building codes do not require that buildings be designed to resist progressive collapse.
Better thermal insulation (i.e., reduced conductivity and/or increased thickness) to limit heating of structural steel and to minimize both thermal expansion and weakening effects. Insulation has been used to protect steel strength, but it could be used to maintain a lower temperature in the steel framing to limit thermal expansion.
Improved compartmentation in tenant areas to limit the spread of fires.
Thermally resistant window assemblies to limit breakage, reduce air supply and retard fire growth.
The 12 recommendations reiterated from the WTC towers investigation address several areas, including specific improvements to building standards, codes and practices; changes to, or the establishment of, evacuation and emergency response procedures; and research and other appropriate actions needed to help prevent future building failures.
Originally posted by ThroatYogurt
reply to post by BigC2012
What questions have been brought up here? I asked for people to list errors on the report.
So far... not any.
I offered to e-mail NIST with a list of errors. All I have been getting is accusations and the same old spew.
Originally posted by BigC2012
Plenty people have listed errors and you ignored them. Why still hold the line that no-one is providing errors when it has been done over and over.
NIST never tested any steel.
NIST had no idea how the building was made.
NIST lied for 7 years by saying it was diesel.
NIST are an organistaion that doesnt use 'science' as they would provide evidence and calculations that can be verified.
NIST ignores ALL POSSIBLE HYPOTHESES such as explosives, even when they fit the collapse better.
How long are you, Throat Yoghurt, going to carrying on your act of ignoring these glaring difficulties with NIST and actually address the questions and errors brought up by tezzjw or griff? Yes keep running TY.
Originally posted by Anonymous ATS
I'm an engineer, and I can assure you that no building collapses because of thermal expansion.
Battalion Chief John Norman
Special Operations Command - 22 years
From there, we looked out at 7 World Trade Center again. You could see smoke, but no visible fire, and some damage to the south face. You couldn’t really see from where we were on the west face of the building, but at the edge of the south face you could see that it was very heavily damaged.
Captain Chris Boyle
Engine 94 - 18 years
Boyle: ...on the north and east side of 7 it didn’t look like there was any damage at all, but then you looked on the south side of 7 there had to be a hole 20 stories tall in the building, with fire on several floors. Debris was falling down on the building and it didn’t look good.
Firehouse: When you looked at the south side, how close were you to the base of that side?
Boyle: I was standing right next to the building, probably right next to it.
Firehouse: When you had fire on the 20 floors, was it in one window or many?
Boyle: There was a huge gaping hole and it was scattered throughout there. It was a huge hole. I would say it was probably about a third of it, right in the middle of it. And so after Visconti came down and said nobody goes in 7, we said all right, we’ll head back to the command post. We lost touch with him. I never saw him again that day.
Deputy Chief Peter Hayden
Division 1 - 33 years
...also we were pretty sure that 7 World Trade Center would collapse. Early on, we saw a bulge in the southwest corner between floors 10 and 13, and we had put a transit on that and we were pretty sure she was going to collapse. You actually could see there was a visible bulge, it ran up about three floors. It came down about 5 o’clock in the afternoon, but by about 2 o’clock in the afternoon we realized this thing was going to collapse.
Firehouse: Was there heavy fire in there right away?
Hayden: No, not right away, and that’s probably why it stood for so long because it took a while for that fire to develop. It was a heavy body of fire in there and then we didn’t make any attempt to fight it. That was just one of those wars we were just going to lose. We were concerned about the collapse of a 47-story building there. We were worried about additional collapse there of what was remaining standing of the towers and the Marriott, so we started pulling the people back after a couple of hours of surface removal and searches along the surface of the debris. We started to pull guys back because we were concerned for their safety.