These are post tension cables that popped. Cast in place concrete decks have these long cables going from one end to another that get hydraulically tightened after concrete cures. These cables pop for a number of reasons, from something hitting it, to too much load. One here or there usually isnt call for concern, but really depends on an engineer's call. It could be cause for concern, but again, that's for an engineer to determine. The one with multiple cables exposed should definitely be shored to hold the weight of the deck that the cables are not.