I don't believe the physics are impossible. The steel frame didn't have to melt. It only needed to soften a relatively little. The molecular movement within the structural elements increases steadily with increased heat, becoming less densely packed and less able to hold the weight it was designed to hold.
I don't believe the physics are impossible. The steel frame didn't have to melt. It only needed to soften a relatively little. The molecular movement within the structural elements increases steadily with increased heat, becoming less densely packed and less able to hold the weight it was designed to hold.