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I'm not an engineer, nor have I slept in a Holiday Inn in a long time, but looking at those images reminds me of rail lines which have been bent in an earthquake. I don't think compressive force is the culprit here. The girders also look like they have bent in the manner of bi-metalic strips which are used in thermometers and thermostats.
I'm going out on a limb here and guessing that the stiffening ribs on four of those girders are not matched and with severe cold the ribs on one side did not contract at the same rate as their partners on the other side of the beam, resulting in torsion.
At any rate: Oops!
Best
Les
__________________
Best
Les
My train of thought has been replaced by a bumper car.
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