How does an airplane pulverize a steel building?

Comments

Calperson's picture
Calperson 7 years 51 weeks ago
#1

The initial impact strips away fire proofing from the steel girders, a high energy jet fuel fire weakens the girders beyond their rated load.

Overload from floors above cause structural collapse.

It is pretty obvious really.

ejk318 7 years 51 weeks ago
#2

According to the oaths of office taken by the President, the Senators, and Congress, they vow to support the Constitution. The Fourteenth Amendment validates the debt, and the payment of such. So, why can't the President, acknowledging this, just authorize the increase of the debt ceiling to keep the nation honorable? Then, if taken to account by the Senators and Congresspersons, surely they will have to acknowledge denial or obedience to their oaths?

Investigate's picture
Investigate 7 years 51 weeks ago
#3

If high energy jet fuel could melt steel, then no jet airplane would ever get farther than the end of the runway and no rocket would ever lift off the pad.

"Overload from floors above" cannot weaken steel girders let alone blast them apart into bits.

Jet fuel cannot melt steel. Steel girders do not collapse under a bit of extra weight.

Calperson's picture
Calperson 7 years 51 weeks ago
#4

The high temperature did not have to MELT the steel or turn it into a liquid. Steel begins to weaken proportionally to its increased temperature.

As the steel got hotter, its rated load got lower. The point where the load of the floors above exceed the ability of the girders is when the collapse started.

But it is ok. You are a product of the teachers union controlled American school system.

Investigate's picture
Investigate 7 years 51 weeks ago
#5

Jet Fuel:

Open air burning temperatures 260-315 °C (500-599 °F)

Maximum burning temperature 980°C (1796 °F)

Melting temperatures of steel:

Carbon Steel 1425 – 1540 °C, 2600 – 2800 °F

Stainless Steel 1510 °C, 2750 °F

Air fires do not get hotter than 250 °C.

Steel starts weakening at 300 °C

Strength vs. Temperature chart for steel:

Steel does not lose any strength up to about 300 °C. It drops to about half strength around 600-650 °C. Then it weakens to very low strength at around 1200 °C.

Thus, jet fuel burns at a maximum temperature of 315 °C in the open air, and steel begins to weaken at 300 °C but still retains half its strength at 600 °C. It would not even begin to fall apart until it reached 1200 °C and would not reach molten stage until 2600 °C.

Maybe one or two girders of one floor of steel building could weaken and bend under the impact of two seconds of burning jet fuel. The remainder of the building, however, did not experience any impact, fire, or weakening. Yet somehow the little airplane reduced the whole building to a pile of sheared-off girders and molten steel.

The question remains unanswered: How does a little tin airplane pulverize a giant steel building?

Calperson's picture
Calperson 7 years 51 weeks ago
#6
Quote Investigate:

Steel starts weakening at 300 °C

Strength vs. Temperature chart for steel:

Steel does not lose any strength up to about 300 °C. It drops to about half strength around 600-650 °C. Then it weakens to very low strength at around 1200 °C.

I bet you shocked yourself when you found that. Good for you, the internet is greatest hope young Americans have of overcoming the teachers unions, and using their initiative and desire to learn they can finally educate themselves.

Jet fuel wasn't the only thing burning in that fire. Also included was carpet, luggage, computers, desks, filofaxes, Office workers, drywall, asbestos, telephones, and telephone distribution equipment, couches and chairs, lighting fixtures and cabling, doors, airline passengers, coffee making equipment, fax machines, reams of paper, my insurance and will papers, etc. etc.

The fire got a pretty good clip going as you may have seen.

Investigate's picture
Investigate 7 years 51 weeks ago
#7

All those things burned up or exploded in a thousand places where no impact fire had occurred. Steel girders nowhere near the impact also exploded into bits.

Minor weakening of steel does not cause it to explode into bits. Steel even at half strength can still support itself.

Investigate's picture
Investigate 7 years 49 weeks ago
#8

The question stands unanswered.

Add comment

Login or register to post comments

Come Cruise with Thom Hartmann in July 2020

Join me for an exciting Bermuda getaway aboard Oceania Cruises, the world’s leading culinary and destination-focused cruise line. Set sail on the reimagined Insignia for 7 nights beginning July 25th 2020. Take advantage of Oceania Cruises’ OLife Choice promotion, where you can choose shore excursions, a beverage package, or onboard credit – Oceania Cruises also includes Wifi! You'll also receive complimentary gratuities, a $50 onboard credit and two exclusive cocktail parties. Did I mention we are planning special onboard events with yours truly? Prices start at $1199.

Reserve your stateroom today by contacting Keene Luxury Travel, and mention the Thom Hartmann Group 800.856.1155

What Do Democrats Really Want?

Thom plus logo Thomas Friedman, the confused billionaire, told us decades ago that "free trade" is what made the Lexus a successful product when, in fact, it was decades of Japanese government subsidies and explicit tariffs that did so.