P.S.
As you point out, the human race has built one hell of a lot of successful bridges (and other things) throughout history without even the remotest idea of what chaos theory is. Or regulations, for that matter. You need to be careful not to get too far off the beam with analysis. While Einstein's theories are the most accurate way of describing the behaviors of mass, gravity and other things, simple Newtonian physics covers the vast majority of situations quite effectively.
You don't need to know chaos theory to build a bridge that doesn't fall down. And regulations are not a substitute for engineering.