I read it from the 737 manual and it states that in case of control jamming you can separate the yokes by applying some force. Also, I heard that 767 (and the 777, I guess) has a split elevator system which in case of emergency can be used as a half from a yoke or the other. I didn't read a lot of details about these features because it was enough to know they are present to help the pilot in an emergency. My concern was for small single engine aircraft where you don't have that redundancy and you actually can't really deal with the problem.