kruser I'm a junior civil engineer and ran a QC lab at a precast plant doing pre and post tensioning. In the video it looks like a hydraulic tensioner.
So this is my professional guess. It was over stressed for the cantilever. I think they came close to the ultimate strength.Then they had to destress it. When you destress you have to put more tension on it to loosen the chuck.I think the rod or one of the end plates broke. One other thing is the chucks could have failed while relieving the pressure. I have seen chucks fail. 450' of strand flying to other end of the building in a blink of a eye.We stressed 1/2" strand to 28,000 psi.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don�t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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