Whoa there Dil...
Expanding and contracting girders??
I think we need to investigate where this sudden cold front came from... you told us the fires were still going strong and now you have girders shrinking like an Arctic swimmer?
The amount of this expansion or contraction even if such a thing were likely would be fractions of an inch... you would not see the building sides buckle inwards.
What you are seeing there is probably the walls being blown up by those surviving "19 Arabs©"