Low stress panel joints

A structure comprising:

• first and second sandwich panels, each comprising first and second planar face sheets held in spaced-apart, mutually parallel relationship by a low-density core defining a thickness dimension between its associated face sheets, said first and second sandwich panels being juxtaposed along an edge to be joined, with the planes defined by said first sheets of said panels mutually orthogonal, said edges to be joined of said first and second panels having said cores exposed, the exposed surfaces of said core of said first panel defining a plane orthogonal to said plane defined by said first face sheets of said first panel;
• and
• at least first and second joining pieces attached to said first and second panels along said edge to be joined, each of said joining pieces comprising a thin, flat L-shaped structure with first and second mutually orthogonal legs, said first legs being longer than said second legs by said thickness dimension of said core, said first joining piece having said first leg affixed to said first load-bearing sheet of said first panel and to said exposed core of said second panel, and said second leg affixed to said first load bearing sheet of said second panel in a first region along said edge to be joined, and said second joining piece having said first leg fastened to said second load-bearing sheet of said second panel and to said exposed core of said first panel, and said second leg affixed to said second load-bearing sheet of said first panel in a second region along said edge to be joined, adjacent to said first region, whereby said first legs of said first and second joining pieces cross at right angles.