[Petronski]

That kind of temp doesn't effect bridges though.

There's no kind of existing bridge defect that could be aggravated by a spell of 90F temperatures?

That seems like a bold statement to me.

[spunkets]

"There's no kind of existing bridge defect that could be aggravated by a spell of 90F temperatures?"

Absolutely not! Engineering problems arise at temps lower than ~10 in steel and cycling around the freezing point of water. this is far from the boiling point of water, and the central concern is just that the different expansion rates are accomodated for in the design. Problems arise when people fail to analyze the design and situation. In this case it's the effect of the cracks, what caused them, and what the new stressesin the bridge look like. Other than the effect of water, the steel and concrete ect... follow the Kelvin temp scale. They had failures with stress redistributions that they failed to recognize.

[Terriergal]

There's no kind of existing bridge defect that could be aggravated by a spell of 90F temperatures? That seems like a bold statement to me.

90 is nothing. It's the construction and vibration and unbalanced load that would do it. (I'm certainly not a pro however).

[Jedidah]

If 90F temperatures could bring down bridges, us folks in Texas and Arizona would have to depend on ferries.

[burzum]

There's no kind of existing bridge defect that could be aggravated by a spell of 90F temperatures?

That seems like a bold statement to me.

For structural steel I would be more worried about colder temperatures and brittle fracture than higher temperatures. The yield strength for structural steel does vary for temperature, and I'd need to pull out a table to tell you how much. But the change up to 90 F will almost certainly be insignificant until you get up to temperatures about 800 F.