[ELI5] High rises steel rust under rain during construction. Will there be any structural issues?

Question

I often see high rises during construction sitting in rain and storms for months especially in places like New York. You can often see rust forming. Aren’t those rust going to cause structural issues?

In: Engineering

Answer 1

The rust you see is just surface rust, similar to the underside of most vehicles. Structural issues would only develop if water was sitting on it constantly with no way to escape.