What effect does a temperature above 1100ºF have on steel?

When steel is exposed to temperatures exceeding 1100ºF, it experiences a significant loss of rigidity, which is critical in the context of structural integrity during a collapse scenario. At these elevated temperatures, the molecular structure of steel undergoes changes that lead to a decrease in its load-bearing capabilities. The steel begins to soften and lose its ability to maintain its shape under applied loads.

This loss of rigidity is particularly important for rescue technicians to understand, as it affects the safety of both structures and rescuer operations. When steel loses rigidity and starts to deform, it can lead to further structural weakening or failure, posing serious risks to anyone working around or within the affected area.

In building construction and engineering practices, materials are rigorously tested to ensure they can withstand certain temperature thresholds before beginning to lose their intended mechanical properties. Understanding this critical concept helps rescue technicians assess risks and make informed decisions when navigating a structural collapse scenario.