On January 19, 2017 an accidental fire, which started by an electric shorting, resulted in the complete collapse of the 16-storey Plasco Building in Tehran. Twenty-two people including sixteen firefighters were killed in that incident. This paper reports the study carried out to investigate the most likely causes of the events and collapse of the structure. The information presented in this study was collected through gathering the limited amount of available information on the structure, generating as-built structural drawings, reviewing construction photographs, interviewing fire-fighters and other witnesses, frame-by-frame analysis of a number of available videotapes showing the structure during the fire as well as during the final stage of collapse. Based on these information and some engineering judgments, the paper summarizes the sequence of events from the start of the fire to final collapse, almost 3.5 h later, and the inferred scenario explaining how the structure collapsed completely. Recommendations are provided based on the lessons learned from that incident.

中文翻译：

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德黑兰 16 层 Plasco 大楼因火灾倒塌

2017 年 1 月 19 日，一场由电气短路引发的意外火灾导致德黑兰 16 层高的 Plasco 大楼完全倒塌。在那次事件中，包括 16 名消防员在内的 22 人丧生。本文报告了为调查事件和结构倒塌的最可能原因而进行的研究。本研究中提供的信息是通过收集有关结构的有限可用信息、生成竣工结构图、审查施工照片、采访消防员和其他目击者、逐帧分析许多可用信息来收集的。录像带显示了火灾期间的结构以及倒塌的最后阶段。根据这些信息和一些工程判断，该论文总结了从火灾开始到最终倒塌（大约 3.5 小时后）的事件顺序，以及解释结构如何完全倒塌的推断场景。建议是根据从该事件中吸取的经验教训提供的。