On　June　24,　2021,　a　40-year-old　reinforced　concrete　flat　plate　structure　building　in　Miami　suffered　a　sudden　partial　collapse.　This　study　analyzed　the　overall　performance　and　key　components　of　the　collapsed　building　based　on　the　building　design　codes　(ACI-318　and　GB　50010).　Punching　shear　and　post-punching　performances　of　typical　slab-column　joints　are　also　studied　through　the　refined　finite　element　analysis.　The　collapse　process　was　simulated　and　visualized　using　a　physics　engine.　By　way　of　these　analyses,　weak　design　points　of　the　collapsed　building　are　highlighted.　The　differences　between　the　reinforcement　detailing　of　the　collapsed　building　and　the　requirements　of　the　current　Chinese　code　are　discussed,　together　with　a　comparison　of　the　punching　shear　and　post-punching　performances.　The　simulated　collapse　procedure　and　debris　distribution　are　compared　with　the　actual　collapse　scenes.