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originally posted by: neutronflux
a reply to: turbonium1
You need to stop and come back to reality, and cite actual facts. Stop creating false arguments.
The buildings were damaged, and had a significant number of vertical columns removed by jet impacts.
You know, the steel columns that take the load of the floors and transfers the loads to the foundations.
originally posted by: wmd_2008
a reply to: turbonium1
Lets at least get some figures correct each concrete floor slab weighed approx 1000 tons the amount of structural steel in one of the twin towers was around 90,000 tonns.
As stated before and for you benefit because obviously YOU don't look at or understand information given this is how the floor slabs are connected to the structure.
The ends of the floor trusses rested on and were bolted to the steel angle cleats in the above image.
Each floor is designed to support it's own weight and equipment people etc on a floor plus a saftey margin.
The FLOORS below the collapse area where the same apart from the 3 service floors.
In simple terms so YOU can understand each floor is designed to support the load on that floor & that floor ONLY.
Each floor was supported by the wall steel and the core steel.
So guess what floors can fall internally.
www.abovetopsecret.com...
None of the steel collected by NIST was weakened by fires to the point of any failure.
So why do you keep claiming steel was exposed to fires which caused failure, from fires that NEVER caused any steel to weaken to the point of failure?
You didn't even answer anything I asked, or said, in my last post. I asked if you knew what the steel samples showed. The steel collected by NIST. Specifically, they were instructed to seek out, and collect, any steel that has been, or perhaps was, exposed to fires, and any damaged steel. Impact damage and fires were already the official causes of both collapses. They only looked for any evidence to support their pre-determined conclusion, that fire and impact damage caused both collapses, nothing else.
www.abovetopsecret.com...
a reply to: turbonium1
ws680.nist.gov...
Page 220 starts the Metallographic analysis of elements exposed to fire.
www.abovetopsecret.com...
reply to: turbonium1
And quote where I ever said the vertical columns that buckled failed do to heat. The bowing caused the load of the upper stories to be no longer transmitted to the foundation. The stain of the load was “caught” in the bowing. When the load was transferred off the foundation to the geometry of the bowing, the vertical columns buckeled.
Any moron knows if terrorists were involved, there is a strong possibility of explosives. Because they JUST TRIED TO BOMB THE TOWER A FEW YEARS AGO.
It's pure nonsense.
What about proving it is even possible?
Nothing built can replicate the collapse, and never will.
Could you ever build a structure, and then collapse it, the same
Failure of Welded Floor Truss Connections from the Exterior Wall during Collapse of the World Trade Center Towers
app.aws.org...
Analysis of the connections supporting the composite floor system of the WTC towers showed that at and below the im- pact floors, the greater majority (above 90%) of the floor truss connections were either bent downward or completely re- moved from the exterior column. This was probably related to the overloading of the floors below the impact region after col- lapse initiation. Depending upon weld joint geometry, detachment of the main load-bearing seats was a result of either fracture in the heat affected zone of the base material (standoff plate detached from spandrel) or through the weld metal (seat angle detached from standoff plate). Failure in both cases was assumed to be a result of a shear mechanism as a result of overloading from floors above impacting those below. There did not appear to be a significant change in distribution of failure modes of the floor truss connections when comparing those connections inside vs. outside of the impact region or those ex- posed to pre-collapse fires and those that were not.
The 'vertical columns' you refer to are actually the 'exterior columns', which were not critical to the overall structural integrity of the building. It was the massive central CORE columns that supported it.
The perimeter columns were designed to provide support for virtually all lateral loads (such as wind loads) and to share the gravity loads with the core columns
conventional strength of materials predicts that a large beam and a tiny beam will fail at the same stress if they are made of the same material. In the real world, because of size effects, a larger beam will fail at a lower stress than a smaller beam.
Then, however, the failure probability, which is required to be 10 to − 6 and actually does have such values for normal-size structures, may become for very large structures as low as 10 to− 3 per lifetime. Such high failure probability is intolerable as it adds significantly to the risks to which people are inevitably exposed. In fact, the historical experience shows that very large structures have been failing at a frequency several orders of magnitude higher than smaller ones.
originally posted by: neutronflux
a reply to: turbonium1
Why would they not look for other causes?
What othe causes would you like them to have looked for.
Please link to the video that showed the audible evidence that explosives were used. Can you cite medical cases were individuals eardrums were burst from the pressure waves from cutting charges. Any demolitions shrapnel recovered with human remains, from injured people? Any demolitions shrapnel blown into the walls of neighboring buildings, into the streets, cars? ( You claim lateral ejection by explosives? No shrapnel to go along with steel weighting tons being thrown about?) Any evidence of an over pressure event while the buckling occurred? Windows blown out? The audible boom of an explosive with enough power to cut steel? Any evidence in the metallurgy?
Or should they have tested for the mythical fizzle no flash explosives that somehow made the towers “fall in their own footprints”, but had the power to cause lateral ejection without the indicative audible pressure wave that goes hand in hand with a pressure wave that would cause latter ejection?
Exactly what should they have tested. Randomly tested over a 1,000,000 tons of building debris for explosives. Why? How would that be meaningful.
Can you point to demolitions shrapnel that could have been logically tested for explosives vs the random testing of 1,000,000 tons of steel?
Nobody knows whether or not any other causes were involved, because there's evidence which wasn't even looked at.
originally posted by: firerescue
a reply to: turbonium1
The 'vertical columns' you refer to are actually the 'exterior columns', which were not critical to the overall structural integrity of the building. It was the massive central CORE columns that supported it.
WRONG - As Usual ......
The exterior wall columns formed an integral part of the load bearing supports
The columns supported about 60 % of the building structure and were responsible for resisting the wind loads
The perimeter columns were designed to provide support for virtually all lateral loads (such as wind loads) and to share the gravity loads with the core columns
Of course had you done any research would have known this ........
by turbonium1
www.abovetopsecret.com...
The 'vertical columns' you refer to are actually the 'exterior columns', which were not critical to the overall structural integrity of the building. It was the massive central CORE columns that supported it.
Aircraft Impact Damage
citeseerx.ist.psu.edu...;jsessionid=5186A591468840A7CA6719E5D359B3D4?doi=10.1.1.367.491&rep=rep1&type=pdf
Depending which case considered in Table 2 will be valid, the number of destroyed
core columns in South Tower will vary between minimum of 7 and maximum of 20. It should be noted that the prediction for the North Tower would be different for two reasons. First, the impact velocity is smaller and hence the kinetic energy induced by the airplane is less. Second, the airplane impacted the tower on different side correlating with the core structure orientation, so that the energy dissipated by these longer floors was larger. Taking the each of the factors above into consideration, the predicted number of damaged core columns in the North Tower will vary between 4 and 12. There will be an enormous difference between the ways in which the global collapse was initiated in both towers. Effect of the local damage on the global collapse of each tower is discussed next.
You really think they shouldn't look for any possible causes, because it's not required, it's too much work, nobody heard any explosives, or saw any explosives, and blah, blah, blah!!
originally posted by: samkent
a reply to: turbonium1
Nobody knows whether or not any other causes were involved, because there's evidence which wasn't even looked at.
Show us the evidence that wasn't looked at.
originally posted by: neutronflux
a reply to: turbonium1
This is you
You really think they shouldn't look for any possible causes, because it's not required, it's too much work, nobody heard any explosives, or saw any explosives, and blah, blah, blah!!
There was no audio signature indicative of a cutting charged setting off with a resultant pressure wave capable of cutting steel.
There was no reported injuries from an over pressure event associated with a charge setting off.
No indication of an over pressure event from charges setting off as in windows blown out.
There was no demolitions shrapnel recovered from adjacent buildings, cars, the street, human remains, or injured persons. Or from jet parts and human remains recovered from building tops.
The hand shifting of WTC rubble recovered over 18,000 pieces of human remains. 6,000 could fit in a test tube. No blasting cap fragments, no shape charge fragments, no demolitions shrapnel, no fragments of detonators, and no CD ignition system remains.
Testing and metallurgical examination showed no signs of steel being worked on by demolitions.
What were they supposed to test for explosives again. Randomly sample 1,000,000 tons of ruble for explosives? Again, how would that have any meaning? Test for the mythical fizzle no flash explosives?