Not to mention that at 1000° it can expand up to 10%. A twenty five foot long beam stretching out another two and a half feet would pop more than a couple rivets loose and twist off the support columns.Did you even look at the attachments I posted? Steel loses 50 percent of its strength at 1100° F. Building fires generate temperatures of 1100° F. On a normal day the twin towers would sway up to 12". Is so hard to believe in is weakened state, the buildings collapsed.