Analysis of information sources in references of the Wikipedia article "Progressive collapse" in English language version.
A progressive collapse is a chain reaction type of failure which follows damage to a relatively small portion of a structure.
A progressive collapse is a chain reaction type of failure which follows damage to a relatively small portion of a structure.
NIST's findings do not support the "pancake theory" of collapse, which is premised on a progressive failure of the floor systems in the WTC towers Instead, the NIST investigation showed conclusively that the failure of the inwardly bowed perimeter columns initiated collapse and that the occurrence of this inward bowing required the sagging floors to remain connected to the columns and pull the columns inwards. Thus, the floors did not fail progressively to cause a pancaking phenomenon.
A progressive collapse is a chain reaction type of failure which follows damage to a relatively small portion of a structure.
