why did the towers collapse
Why did the World Trade Center towers collapse? The towers of the World Trade Center were designed to withstand as a whole the horizontal impact of a large commercial aircraft. So why did a total collapse occur? The reason is the dynamic consequence of the prolonged heating of the steel columns to very high temperature. The heating caused creep buckling of the columns of the framed tube along the perimeter of the structure, which transmits the vertical load to the ground.