Steve, thanks for your reply ! The 2x8 beams are fastened to the sides of the posts by carriage bolts. One on each side of the post. They do not sit on top of the posts. The posts, and thus the beams, are spaced on 8 foot centers. The 8 ft long deck boards are in a checkerboard pattern.
If I interpret what you are telling me , it looks like I am going to have to dismantel and rebuild at least part of this deck if it is going to support a hot tub ?