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The Simple Collapse Model of Ba\v{z}ant and Zhou is evaluated for aprogressive floor collapse of a tall building. A sequence of energy estimatesindexed by the collapsing floors is derived. Each of the estimates gives asufficient condition to arrest the collapse at a given floor. The firstestimate of this sequence has been stated by Ba\v{z}ant and Zhou and has beenrepeatedly cited later on. However, this estimate is not optimal in the sensethat the following estimates give a weaker condition to arrest the collapse.

Energy Estimates of Progressive Floor Collapses and the World Trade Center Catastrophe