An observed steel beam bending under fire is an indicator of imminent failure.

• A. Nothing to worry about
• B. Imminent ignition
• C. Release of toxic fumes
• D. Imminent Failure

Answer: (D)

When steel is heated in a fire, it loses strength and stiffness, so the same load can cause more deflection. A beam that begins to bend under fire shows the structure is no longer able to carry its intended load safely because its capacity has weakened. Seeing noticeable sagging or bending is a warning sign that failure could happen soon if the heat continues or the load remains, making imminent failure the best interpretation.

This isn’t about ignition or fumes—the beam’s bending reflects structural degradation, not flammability of the steel, and it certainly isn’t something to ignore.