What does is sound like when you break a big beam?

Today my companies lab live streamed the load test of a ultra high performing concrete beam that was expected to break around 1 million pounds. 

And I’ve been in a building and in the lab when these things go and it’s amazing. Shakes the whole building. 

So when you are working from home and have a curious six year old you watch the live stream of “work” with the promise of a loud bang and some excitement. We didn’t watch the live stream but the video link after and fast forwarded to the good stuff. 

We watched and listened as hairline cracks ripped open. He learned about load-displacement curves. And then Calvin jumped 5 inches in his chair when it failed. 

It was fantastic.