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As forensic engineers, it is often our responsibility to assess the structural integrity of a building after a natural disaster or an event from unfortunate circumstances. It is also our responsibility to determine the necessary repairs that need to be made to the structural framing of the building in order to return it to a safe and functional state. This blog focuses on one of the unfortunate events that we tend to see in our professional lives; fire and how it affects structural steel framing. Within this blog, general fire science will be discussed, along with how the physical properties of steel change due to high temperatures, what happens to structural steel during a fire and after, and evidence that we as forensic engineers need to look for when assessing steel framing after a fire event. This blog is based on the American Institute of Steel Construction (AISC) publication Facts for Steel Buildings – Fire.