You're so clueless it's funny!<quoted text>
According to architects there were no updrafts the towers were designed to prevent that.
Commonsense tells us that sheet metal may buckle with a 1000 degree fire but not massive steel beams.
The exhaust valve in your auto engine normally run around 1500 degrees, it doesn't warp or melt.
Furthermore, there were nothing that was flammable in the core columns.
Heat alone doesn't cause steel to buckle...and believe or not, there's different grades of steel which are applicable to different conditions.
The valves in your car engine are not A36 steel you dippy little useless idiot.
"To increase high temperature strength and corrosion resistance, various elements may be added to the steel. On some passenger car and light truck engines, the original equipment intake valves are 1541 carbon steel with manganese added to improve corrosion resistance. For higher heat applications, a 8440 alloy may be used that contains chromium to add high temperature strength. For many late model engines (and performance engines), the intake valves are made of an alloy called "Silchrome 1" (Sil 1) that contains 8.5 percent chromium."
Good grief twoofers are fools!