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In 1995, British Steel did a series of tests on mock structures filled with office furniture to see the stability of a steel building during different fire scenarios, to ensure that they could not collapse from high temperatures.

Footage of one of the tests, which appeared in the documentary "World Trade Center: Anatomy of the Collapse", showed an 8-story steel and concrete building full of office furniture burn for hours without structural failure.

According to the film: "This was the largest test of its kind ever conducted. It showed how unprotected steel can be distorted, even by a normal office fire. But as is typical in steel buildings, the structural beams only slowly and progressively warped and sagged. There was no chance of a sudden collapse."
More on the 1995 British Steel structural fire tests:
WATCH  World Trade Center: Anatomy of the Collapse - 1995 British Steel Fire Tests 
READ  Civil and Environmental Engineering at University of Edinburgh: British Steel Fire Tests:
Analysis of results from BS/TEST3 model
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