The author of the video in the original post had a really good follow-up post that explained that (benzbanana posted it above). Basically, his hypothesis was that the PT rod was damaged when lifting the bridge into place, possibly because one of the lifting supports was not positioned as designed. So he thinks they overtensioned because they misdiagnosed why the stress on the beam wasn’t coming up to the expected level, and they just kept on trying to tighten the PT rod until it failed.
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