Airliners are certificated to a rate of descent and weight combination. Sadly it is not easy to turn this into a simple g reading as the value that would be shown on any particular g meter would depend in where it was mounted and indeed the nature of its mounting.
Clearly people experienced on a particular aircraft type may well be able to correlate damage (or not) to a particular g meter reading but that is not the same thing as coming up with a simple number to cover a range of types.