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<p>Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity</p> <p><b>New page</b></p><div>== Summary ==<br /> Thermal expansion of heated floor beams pushed a girder off its seat at a column in World Trade Center 7. Based on National Institute of Standards and Technology (2008), pp. 21–22.<br /> <br /> Original vector illustration for [[Structural fire engineering]], level 2 Intermediate.<br /> <br /> * Source basis: National Institute of Standards and Technology (2008), p. 21 (expansion at or below about 400 °C; forces when expansion is resisted) and p. 22 (girder between Columns 79 and 44 pushed west, walked off its support at Column 79)<br /> * Alt text: Plan sketch of a floor: heated beams expand and push a girder sideways until it slides off its seat at a column.<br /> <br /> == Licensing ==<br /> New drawing by Fire Safety Academy. © Fire Safety Academy.</div>

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