Fatigue MAY have played a small role in the bridge failure, but, for the most part, it was FIRE.If it was fatigue, all the connected roads and bridges are about the same age, same materials, probably same engineer.
I am a little stunned they aren't doing inspections all over that area.
Irrelevant.Was it exposed steel girders or concrete girders?
A material does not have to be "combustible" to fail under intense heat.And neither one is a combustible material. So, was this bridge bombed?
A material does not have to be "combustible" to fail under intense heat.
--Steel begins to loose it's strength, even as it begins to twist and de-form, under intense heat.
--Concrete loses its water content (VERY important, believe it or not), even as it's "aggregate" begins to expand. This can literally turn Concrete back into dust. (INTERESTING, but, unrelated factoid: Do you know that Bridge Concrete, which is some of the strongest, has literally MILLIONS of micro fractures and cracks in it's structure? They are so small, we do not see them, and the aggregate acts as a reinforcement that holds it all together. Concrete is an incredibly interesting material, and there are lots of things about it, that the common person does not realize....)
Exactly.The twin towers were a pretty good example...