Professionals in Israel estimate that the fuel and the explosions following the collision created high heat inside the buildings; We emphasize: in Israel this would not happen - most of the buildings are made of concrete, which is fire resistant
Anat Georgi and Miri Riley, Haaretz
The collapse of one of the towers. Hold 45 minutes (Reuters)
The twin towers did not collapse as a direct result of the planes hitting,
Although the intensity of the impact was very high. The collapse of the towers, about 45
Minutes after the impact, it happened due to the high heat prevailing in the buildings -
As a result of the explosion of the fuel containers in the planes or as a result of the burning of the fuel,
that melted the steel that makes up the buildings, experts estimate
In Israel.
The Twin Towers, like most of the towers in New York and the western states,
Constructed of steel, which is considered a strong and cheap material that allows for quick construction.
With this method, steel beams are cast and concrete ceilings are placed on top of them. The beams are connected
between the core of the building and the shell, and coated according to the standard with the resistant material
fire. However, despite the coating, the weakness of the steel is that it melts in the heat
higher than 700 degrees Celsius.
According to Israel David, who designed many residential towers in Israel, including a tower
The city gate in Ramat Gan, according to the way the towers collapsed, seems to be the cause
The collapse had the melting of the steel beams on the floors below the impact site.
"It appears," said David, "that the jet fuel leaked into the building and created a column of fire
Inside the building, which melted the steel beams on these floors, and the protection against
The fire, which lasted 45 minutes." The collapse of these floors, David adds, caused
to the collapse of the entire building.
According to the chairman of the Union of Independent Engineers and Architects, Yoav Sarna,
Buildings are not designed and are not capable of being impact resistant
with such strength, but designed so that they do not collapse immediately as a result of the impact
and allow the people staying in them to escape.
The plane would not penetrate a concrete structure
Most of the tallest buildings in Israel are made of fire-resistant concrete. only
Several buildings are made of steel, including the Hasmonean Tower, on Petah Tikva road
The corner of the Hasmoneans, Beit Zion, the building on Barzel St. 3 in Ramat Hay'il
in Tel Aviv and the Rubinstein Towers at the old central station. the reason
For this proportion is that the steel is imported and the concrete is produced in Israel and therefore
Cheaper. According to David, in recent years strong concrete has been produced in Israel
more, which allows construction to a height of 250 meters.
In the case of a crash like the one in New York, David said, it's likely
that a concrete structure would not collapse. According to him, the plane would not have been able to penetrate
the front of the building and was left hanging. According to him, the space inside the towers
The twins allowed the penetration of the planes into the core of the building. in the buildings
Of concrete, the plane would encounter concrete barriers in the core and front, and in any case
The high heat would not have caused the collapse of the buildings but damage to them.
Shemaya Ben Avraham office, construction specialist engineers, designed between
Permit the Azrieli Towers, Beit Y.B.M. and Shalom Building. Moti Cohen, partner
In the office, he said: "Any hit by a plane with such intensity can end, if
It hits the top of the building, only destroying the floor it hit.
If high heat is generated that damages the steel, it loses its strength. was created
Collapse process and the lower floors cannot bear the loads. so
A chain reaction is created until the building collapses. The collapse of the ceilings is on
This gravity caused the collapse of the Twin Towers, which is why it took time between
The vulnerability to collapse".
The critical point, according to him, is an injury that causes a chain reaction of
Collapse also on the floors below the damaged floor. "Most of the tall buildings
In Israel they are concrete. This is also how they planned the Kalvo Shalom building, which was the tower
The first in Israel, and which was established in the 60s, and that's how they built the Magdali project
Azrieli Both were built with concrete construction and not steel," he said.
Regarding the differences between the two construction methods, Cohen said: "You can get it in steel
And in the same type of concrete. The steel also needs fire protection. can be protected
It is protected against normal fire with a concrete coating, but it can be protected from explosion
Like in the Twin Towers."
Israel is safer
The CEO of the Contractors Association, Shmuel Arad, said that the breakdown or collapse
of the towers, beyond the attack itself, depends on the American construction method.
Construction in Israel, according to him, is safer and the technique used to build, mainly
With the introduction of MMDs (residential protected space), which run along the entire tower,
Does not allow the collapse of the building in the way the towers collapsed.
"We did experiments on buildings in Israel, we used tens of tons of material
Exploded and the building was damaged, but it did not collapse. And it is so, because the dimensions
They add durability," said Arad.
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