if you're heavy and strong enough, you can break damn near ANything.
I think I saw something buried in some Specialized literature, that most of their bikes are designed for max rider weight of 200 or 220 lbs. I'm sure other makers are the same.
if you're not dirt jumping on those pedals, and you're a spinner rather than a masher, you'll be fine.
I snapped a Phil Wood bottom bracket on my road bike once when I was ~ 165 lbs... the non-drive-side crank came completely off mid stroke on a hill climb. ooops!
Experience is what you get when you don't get what you want.