The effect of gravitational wave is like tidal forces? What would happen if a strong gravitational wave passed through a human body or any other kind of material? 

The shape of the human body would change?

Would the human body be distorted apart? 

If so, would the person survive?
It depends what you mean by "very strong". 

The announced first detection (14th September 2015) was considered a very strong signal and that still only stretched the 4 km detector arms by less than the width of a proton (a tiny particle inside the nucleus of an atom). This wave would have no effect on a person.

You could hypothesis a stronger wave that would stretch and squish a person, I'm not sure what effect this would have but there are no objects in nature capable of producing waves this strong, even something as close as our sun becoming a supernova wouldn't be that strong, so it will never happen in real life.