| abstract |
The present invention is a load bearing structure comprising: a polymer core having a top side, a bottom side and a width portion having a width portion between the top side and the bottom side Joining the thicknesses of the two, the bottom side includes at least one depression extending substantially along the length or width of the bottom side, the at least one depression including a depression, a set of closely spaced depressions, or a depression combined with a depression. A combination of a set of closely spaced recesses; at least one corresponding member cooperating with one of the at least one recess, the corresponding member comprising at least one raised central portion and extending from both sides of the raised central portion two flat sides of the The bottom side, the width portion, and at least a portion of the top side of the body are joined. |