World Trade Center

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Roderick Grant
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Joined: Wed Mar 29, 2006 7:48 am

World Trade Center

Post by Roderick Grant »

For those of you interested in structural engineering, there is a special on PBS tonight, "Leaning Out," about Leslie E. Robertson, engineer of the World Trade Center.

SDR
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Joined: Sat Jun 17, 2006 11:33 pm
Location: San Francisco

Post by SDR »

One of our local PBS stations ran the Pedro Guerrero special the other night; perhaps it's making the rounds again ...

S

outside in
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Location: chicago

Post by outside in »

Its unfortunate that they didn't incorporate reinforced concrete elevator/service/stair cores in lieu of the multiple drywall solution they ultimately came up with. Would have saved lives.

Roderick Grant
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Joined: Wed Mar 29, 2006 7:48 am

Post by Roderick Grant »

The hour was a bit disappointing. It was more an apologia and biography than a critique of the WTC. When the project was first published, all the architects I knew were contemptuous of it as design. Yamasaki was not highly regarded by the profession.

One main reason the buildings were built on the cheap was that the owner wanted (as is usually the case) to maximize profit. When they were destroyed, he tried to collect double on the insurance, claiming they were 2 different events. The court found otherwise.

DRN
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Location: Cherry Hill, NJ

Post by DRN »

I found the discussion of the elevator and stair towers to be damning with respect to the judgment of the architects and engineers of the WTC.
I had read Minoru Yamasaki worked for Shreve, Lamb & Harmon, the architects for the Empire State Building, earlier in his career. He was aware of the accidental B-25 crash into the ESB in 1945 and the resulting fire with flaming debris in an elevator shaft, and stated the WTC was designed to withstand a Boeing 707 strike. Didn't anyone believe the gypsum board and stud shafts might be vulnerable to high energy impact if survival of a plane strike was seriously being considered as a design parameter?

WTC on 911 was too many things going wrong at once, but the shaft construction was beyond the pale....it allowed the exit stairs, the elevators, and most importantly, the fire suppression riser pipes to be severed in a single swipe.

SDR
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Joined: Sat Jun 17, 2006 11:33 pm
Location: San Francisco

Post by SDR »

Is it the case, also, that the joists were allowed easily to disengage from the core and/or the perimeter walls ? I'm trying to recall what I read in earlier reports ...

One wonders if the plotters were aware of the vulnerabilities of the structures---or whether that wasn't an issue for them.

S

DRN
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Post by DRN »

I’m not certain how much Osama bin Laden counseled the plotters, but bin Laden’s father’s businesses were large scale construction based. It has been surmised that bin Laden had some knowledge of construction technology and knew details of the WTC garage bombing in the early 1990’s that was intended to collapse a tower.

SDR
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Post by SDR »

The planes hit the buildings at different heights; the consensus at the time was that the collapses were "just lucky" for the perpetrators---as I recall it. I just wondered if there had been any change to that conclusion.

S

Tom
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Location: Black Mountain, NC

Post by Tom »

Then there’s WTC7.

Rood
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Post by Rood »

DRN wrote:I found the discussion of the elevator and stair towers to be damning with respect to the judgment of the architects and engineers of the WTC.
I had read Minoru Yamasaki worked for Shreve, Lamb & Harmon, the architects for the Empire State Building, earlier in his career. He was aware of the accidental B-25 crash into the ESB in 1945 and the resulting fire with flaming debris in an elevator shaft ...
I remember it well, images having been imprinted in my brain, after seeing a News of the World film at our local theatre, not too long after the 1945 accident. It is why initial, early radio reports of the first WTC crash didn't alarm me, too much.

Reading about what actually happened when the plane hit the Empire State Building, and it's elevators is quite revealing. See:

https://wiki2.org/en/1945_Empire_State_ ... B-25_crash

Tom
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Joined: Sun Jan 30, 2011 7:53 pm
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Post by Tom »

“Dancing Israelies� ?
WTF ?

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