System for building a load bearing structure

A system for building a load bearing structure for supporting a compressive load, the system including a plurality of wooden members including:

• a first member including a first body having a recess therein;
• a second member including a second body having protrusion extending therefrom;
• and
• a third member including a third body having a recess therein;
• wherein the protrusion of the second member is locatable within the recess of the first or third member to interconnect the first and second or third and second members together to form the loading bearing structure, wherein the protrusion is not rotatable within the recess, and;
• wherein the third member has a recess with a depth greater than a height of the protrusion of the second member such that a cavity is formed between an upper inner wall of the third member and a top portion of the protrusion of the second member when the second and third members are interconnected, the cavity provides a stress concentration around the recess;
• wherein, when the load bearing structure is sufficient for supporting the load a distance between the upper inner wall of the third member and the top portion of the protrusion of the second member will remain constant, and
• when the load bearing structure is insufficient for supporting the load a distance between the upper inner wall of the third member and the top portion of the protrusion of the second member will be compressed.