"collapse of buildings" . . "breaking" . "structural integrity" . . "material fatigue" . . "building collapse" . "Structural integrity and failure#Notable failures" . "collapse" . . "Structural integrity and failure" . "structurally unsound" . . "integrity" . "Structural failure" . "failure" . "collapsing" . "collapsed" . "fails" . . . "structure had failed" . "structural defects" . "Structural integrity" . . "north wall of the building collapsed" . "integrity is compromised" . . "Mechanical failure" . . . "breakage" . "structural loss" . "structural collapses" . "mechanical failure" . . . "structural or foundation failure" . "structural integrity and failure" . . . "strong enough" . "collapsed buildings" . . "structural failure" . "ripping off" . "integrity failures" . "Structural integrity and failure" . . "structural collapse" . . "failing" .