Go look up "expands" in a thesaurus (if you can put your weed down long enough) and tell me what you find under words beginning with "G" in the list.
What a dope.
Grow is not th term used for the expansion of metal, regardless of how much you flail and spin...lol
Really asshole? Do you even look up stuff before posting it? Obviously not.
Thermal Expansion Calculations
Enter your length of pipe and pipe temperature to calculate the thermal growth in inches for the various materials.
What a dumbass.
The fires in the WTC buildings did not reach the temps required to
cause the expansion of the steel, and certainly not cause melting of the steel, to produce the type of collapse that occurred.
According to your Expansion Calculator, for piping, even entering temps of 600F degrees to a 100 ft length, produces only slight variations of expansion.
This is for piping,

gauge thickness unknown..not for the massively huge beams and support structure that was used in the construction of the WTC.
Quote from the FEMA report into the collapse of WTC's One and Two (Chapter Two).
"The time to consume the jet fuel can be reasonably computed. At the upper bound, if one assumes that all 10,000 gallons of fuel were evenly spread across a single building floor, it would form a pool that would be consumed by fire in less than 5 minutes"
So, you say that the temps from the combustible materials inside the building were hot enough to cause this expansion and in such uniformity, that the building collapsed in a straight down symmetrical fashion? The evidence against your theory is overwhelming, for even just one building, and to believe it happened in 3 buildings...in one day...for the first time ever..is plain fucking outrageously nuts.
The temperature was nowhere near high enough to be caused by office fires to even begin explaining the World Trade Center Tower collapse.
building fires with hydrocarbon fuels do not cause the straight down collapse of steel buildings, in seconds.
Quote from the FEMA report (Appendix A).
"In the mid-1990s British Steel and the Building Research Establishment performed a series of six experiments at Cardington to investigate the behavior of steel frame buildings. These experiments were conducted in a simulated, eight-story building. Secondary steel beams were not protected. Despite the temperature of the steel beams reaching 800-900° C (1,500-1,700° F) in three of the tests (well above the traditionally assumed critical temperature of 600° C (1,100° F), no collapse was observed in any of the six experiments."
The North Tower suffered no major structural damage from the intense office fire of February 23, 1975, we can conclude that the ensuing office fires of September 11, 2001, also did little extra damage to the towers.
WTC North Tower fire on February 13, 1975 lasted 3 to 4 hrs= no collapse
WTC North tower fire on September 11, 2001 lasted 1¾ * hrs=total collapse and pulverization
WTC South tower fire on September 11, 2001 lasted 1 * hr.=total collapse and pulverization
WTC 7 fire on September 11, 2001 duration/intensity unknown=total collapse and pulverisation
1st Interstate Bank fire on May 4-5, 1988 lasted 3.5hrs=no collapse
Broadgate Phase 8 fire on June 23rd, 1990 lasted 4.5hrs.=no collapse
1 New York Plaza Fire on August 5, 1970 lasted 6hrs=no collapse
One Meridian Plaza fire on February 23-24, 1991 lasted 19hrs.=no collapse. History is very much against your theory.