I don't know where you get your stuff from. Is the map getting nuked? Ok, just looks for something to instantly hide behind. I don't believe in fairy-tales about a Kamehameha landing in your spawn every second, unless your on a 50 person max server. I think your overdoing it. Are you getting beamed badly? Then that's just tough luck.
If your getting pwned too bad, don't come here and figure out some solutions how you can survive 5 seconds longer. If your spawning, don't ever just stand still and charge at the place your spawning. I know from experience, those people doing that are getting nuked, simple as that.
If you transform, hide behind any rock. Like the cell day/night maps, you can just walk a bit backwards, hide beyond the enormous rock and you can transform, explosions don't go through walls (Except if someone has 10 million and the average server pl is around 1 mil).
If your just getting owned, it's not your fault. Just don't complain about it. Whenever I join a game full of beam spammers, I manage not to die a single time and just keep beating the others around. I don't do stupid things like standing still and hoping I don't get shot. I go to a place I call safe and transform.
If you keep moving, beams can't touch you. And if you still don't know, use the 'teleport' button and push it a few times, that way you can dodge map nukers.