What is the critical temperature at which steel trusses can fail from heat exposure alone?

The critical temperature at which steel trusses can fail due to heat exposure is commonly recognized at around 1,000°F. At this temperature, steel begins to lose its structural integrity significantly. Structural steel can handle high temperatures, but once it approaches this critical threshold, it experiences a decline in strength and stiffness. Continued exposure to temperatures at or above this level can lead to phenomena such as buckling, warping, or complete structural failure during a fire scenario.

Understanding this critical temperature is crucial for firefighters and building safety inspectors as it helps them assess the risks in structures during a fire. Recognizing the temperature at which steel begins to lose effectiveness allows for timely evacuation and decision-making in emergency situations.