NISTs forensic testing of wtc steel showed no signs of the temperatures sufficient to weaken steel
That's a typical 9/11 CT lie necessitated by the fact that the truth just doesn't support their CT silliness.
It as quote is from the former NIST CHIEF FIRE INVESTIGATOR..you are calling him a typical liar /CT ?...on what basis
No ... I'm calling you a liar. Quintiere is not a 9/11 foil-hatter and
specifically said he is
not a supporter of theories that the Twin Towers were brought down by pre-planted explosives but rather he had problems with NIST's research methodology. Quintiere, who left the NIST back in the 1990s (well before the 9/11 attack on America by your Jihadi brethren) never said their "forensic testing of wtc steel showed no signs of the temperatures sufficient to weaken steel" as you claim. As already mentioned, your lying is necessitated by the fact that the truth just doesn't support your CT silliness. Quintiere has had 8 years to substantiate his doubts about the NIST report. Do you have any follow up studies or scholarly papers on the matter from the good doctor?
Here are the pesky answers to your questions that were published well after his doubts.
Questions and Answers about the NIST WTC 7 Investigation
How did the fires cause WTC 7 to collapse?
The heat from the uncontrolled fires caused steel floor beams and girders to thermally expand, leading to a chain of events that caused a key structural column to fail. The failure of this structural column then initiated a fire-induced progressive collapse of the entire building.
According to the report's probable collapse sequence, heat from the uncontrolled fires caused thermal expansion of the steel beams on the lower floors of the east side of WTC 7, damaging the floor framing on multiple floors.
Eventually, a girder on Floor 13 lost its connection to a critical column, Column 79, that provided support for the long floor spans on the east side of the building (see Diagram 1). The displaced girder and other local fire-induced damage caused Floor 13 to collapse, beginning a cascade of floor failures down to the 5th floor. Many of these floors had already been at least partially weakened by the fires in the vicinity of Column 79. This collapse of floors left Column 79 insufficiently supported in the east-west direction over nine stories.
The unsupported Column 79 then buckled and triggered an upward progression of floor system failures that reached the building's east penthouse. What followed in rapid succession was a series of structural failures. Failure first occurred all the way to the roof line-involving all three interior columns on the easternmost side of the building (79, 80, 81). Then, progressing from east to west across WTC 7, all of the columns failed in the core of the building (58 through 78). Finally, the entire façade collapsed.