An extruded node is disclosed comprising a longitudinally extending substantially hollow core and at least one longitudinally extending, hollow flange, extending outwardly of and integral with a longitudinally extending side portion of the core. This invention also provides a joined structure wherein at least one longitudinally extending lineal member has a hollow peripheral portion defined by walls having inside surfaces adapted to mate with outside surfaces of a mating hollow flange of the extruded node. In this joined structure the peripheral portion of the lineal member is inserted over the hollow flange of the node to an extent that the outer peripheral surface of the lineal member surrounds the integral wall of the node and the outside surfaces of the sidewalls of the hollow flange and the inside surfaces of the lineal member mate along substantially the entire length and around substantially the entire perimeter of the flange.