@los_vegas_vintage: #CapCut #southtowercollapse The destruction of the Twin Towers has been called "the most infamous paradigm" of progressive collapse.[24] Each collapse began with the local failure of the vertical load-bearing components of the floors that were hit by the planes and progressed to encompass the whole of the structure.[58] Structural components were severed, releasing gravitational energy that transferred loads downwards by way of serially propagating impact forces.[59] Excepting the top floors of the building, which would not have released sufficient gravitational energy to bring about a total collapse, the collapses could have begun with the failure of any story.[60] The towers collapsed symmetrically and more or less straight down, though there was some tilting of the tops of the towers and a significant amount of fallout to the sides. As the collapse progressed, dust and debris could be seen shooting out of the windows several floors below the advancing destruction, caused by the sudden rush of air compressed under the descending upper levels. During each collapse, large portions of the perimeter columns and the cores were left without any lateral support, causing them to fall laterally towards the outside, pushed by the increasing pile of rubble. Consequently, the walls peeled off and separated from the buildings by a large distance – about 500 ft (150 m) in some cases – hitting neighboring buildings and starting fires that would later lead to the collapse of Building 7. Some connections broke as the bolts snapped, leaving many panels randomly scattered.[61] The first fragments of the outer walls of the collapsed North Tower struck the ground 11 seconds after the collapse started, and parts of the South Tower after 9 seconds. The lower portions of both buildings' cores (60 stories of WTC 1 and 40 stories of WTC 2) remained standing for up to 25 seconds after the start of the initial collapse before they too collapsed.[31]

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Friday 28 February 2025 12:50:39 GMT