Not yet. (crossing fingers, knocking on wood, wearing a garlic necklace, throwing salt over my shoulder)
Only broken rods were due to car door accidents, and one while trying to free a snagged lure. I have heard rods (or more likely just the lamination) crack, and have watched guys get spooled by fish that were unexpectedly large & fast.

I've been impressed with many rods that seemed to have much more strength, limberness, and backbone than I would ever have guessed!