Progressive collapse of a structure is defined as the spread of an initial local failure of a structural element that eventually results in the collapse of the entire structure or a major portion of it. This type of collapse occurs out of proportion; hence it is also called disproportionate collapse.

To know more about the Typology of Progressive Collapse, read the article in the link given below-

https://theconstructor.org/building/know-how-progressive-collapse/290721/5