spaced from the ends of a tier or floor and having its failure sections blown out here again the beam 57 and columns 54 55 and 56 provide a beam structure to carry the load above the affected bearing panel it is desirable in the case of an explosion to prevent any failure section which is subjected to a blast from being blown away from the building structure and thereby preventing damage by the flying section it is desirable to provide each failure section with a hinge arrangement which will allow the section to swing away from the blast while remaining connected to the bearing panel fig1 and 11 illustrate one form of hinge for a failure section of a bearing panel a plurality of spaced apart reinforcement rods or bars 75 are embedded in the concrete panel and the failure section at an edge of the latter and terminate in the section in this example the reinforcement bars extend across the upper edge 42 of the failure section when the failure section 38 having hinge bars 75 therein is subjected to a blast these bars will bend as shown in broken lines in fig1 to allow the section to swing outwardly to relieve the blast pressure but will keep the section connected to the bearing panel a horizontal reinforcing bar 76 is positioned to strengthen the panel above the upper edges 42 of failure sections 38 each large bearing panel is provided with lines of weakness along.