a corner connection between three constructional elements 9 of the type shown in fig2 arranged mutally at right angles the dimensions of the apertures 6 and 7 and their positions on the elements 9 are such that the connection may be secured by two bolts 13 inserted through registering apertures in the overlapping flanges and lateral and vertical loads applied to the connection are applied as bearing loads upon both the bolts it will be observed that the constructional elements as shown in the drawings all include a small radius curvature at the junction of the flanges thus it will be appreciated that when elements are to be secured together at right angles as shown in fig1 and 11 the distance b between the row of apertures and the other flange of the element should be greater than centre to centre distance a between the apertures lengthwise of the element if the elements are to be connected with the flanges of adjacent elements in face to face contact and the apertures properly registered preferably distance b is equal to the sum of distance a distance d and an allowance for the radius at the flange junction the bolt 13 shown in plan view.