> Madrid Fire Re-opens 9/11 Questions: Why did the twin towers fall so fast?
10 March 2005, 23:30
Fact: The Port Authority used lightweight open web trusses to span the distance between the 47 heavy steel columns in the center and the strong exterior columns. Read the Fema and NIST reports. They used these trusses and thin lightweight concrete to save weight so they could build higher. The buildings withstood the impact but were not able to withstand the fires which came afterwards. Unprotected lightweight steel trusses distort and fail to carry their loads after about ten minutes when exposed to fire.The fireproofing was shown to be deficient in the towers.
Fact: The steel didn’t ’melt’ it first expands and bowes from increasing temperatures when heated and then looses strength over 1300 deg F.and eventually becomes elastic if it gets any hotter.
Fact; The people standing at the edge of the building in the hole made by the plane had the wind at their backs and the fires were not all that hot in the beginning. The fires were being pushed to the interior and accelerated in the south side by the extra air.
Fact; The sismic evidence shows the forces released by the collapse. Each floor weighed over 500 tons. A floor falling and impacting the floor below would transmit this force directly to the heavy steel columns which were directly connected to bedrock and would have transmitted the vibrations through the earth.
Fact: There is always a first time especially if you are pushing the limits on the codes. Three or four buildings at the WTC collapsed from fire.
Fact; If the concrete was inadequately cured it would have disintegrated in the collapse impacts.
Fact" Buildings 5 had a major interior collapse from fire and 6 was built differently than the Towers.
Do I have to go on? You obviously didn’t read the ’government’ reports and apparently make up facts to suit your preconceived ideas. If the ’basements and footings were ’exploded’ first’ the towers would not have collapsed downwards from the top sections where the fires were. P.S. the Madrid High rise was a reinforced concrete building not steel.
Fact: The Port Authority used lightweight open web trusses to span the distance between the 47 heavy steel columns in the center and the strong exterior columns. Read the Fema and NIST reports. They used these trusses and thin lightweight concrete to save weight so they could build higher. The buildings withstood the impact but were not able to withstand the fires which came afterwards. Unprotected lightweight steel trusses distort and fail to carry their loads after about ten minutes when exposed to fire.The fireproofing was shown to be deficient in the towers.
Fact: The steel didn’t ’melt’ it first expands and bowes from increasing temperatures when heated and then looses strength over 1300 deg F.and eventually becomes elastic if it gets any hotter.
Fact; The people standing at the edge of the building in the hole made by the plane had the wind at their backs and the fires were not all that hot in the beginning. The fires were being pushed to the interior and accelerated in the south side by the extra air.
Fact; The sismic evidence shows the forces released by the collapse. Each floor weighed over 500 tons. A floor falling and impacting the floor below would transmit this force directly to the heavy steel columns which were directly connected to bedrock and would have transmitted the vibrations through the earth.
Fact: There is always a first time especially if you are pushing the limits on the codes. Three or four buildings at the WTC collapsed from fire.
Fact; If the concrete was inadequately cured it would have disintegrated in the collapse impacts.
Fact" Buildings 5 had a major interior collapse from fire and 6 was built differently than the Towers.
Do I have to go on? You obviously didn’t read the ’government’ reports and apparently make up facts to suit your preconceived ideas. If the ’basements and footings were ’exploded’ first’ the towers would not have collapsed downwards from the top sections where the fires were. P.S. the Madrid High rise was a reinforced concrete building not steel.
Retired Fire Chief