Interesting- and well written!

I’d take exception to using the Tacoma Narrows bridge (AKA ‘Galloping Gertie’) as an example of a suspension bridge failing due to a miscalculation of gravity loads.

As I remember, that failure had more to do with wind currents causing an oscillation around the harmonic frequency of the roadbed portion of the bridge. Possibly relatedly, I’ve read of Nikolai Tesla making an entire hotel building shake using a small device attached to a beam in the basement, using a small force moving at just the right time to reinforce the building’s natural period of oscillation. Possibly an idea for an article?