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Peak Permissible Blast Loads
The following schedule is a guide only of ‘Peak Permissible Blast Loads’ calculated for a range of door sizes secured with a varied number of bolts and differing materials.
The assessments for each door and bolt configuration are based on a number of assumptions, such that the figures should be used for guidance only, it is assumed that:
The load is distributed equally (50/50) between the hinge side and the leading edge of the door
The hinge and door frame is capable of resisting the applied load
The door leaf is substantially stiff such that the load is transmitted directly to the support points (ie. hinge on one side and bolts on the other)
The load is evenly distributed on all bolts and the position of the horizontal bolt has no effect on load distribution - in a normal door design we have considered that the horizontal bolt would take load from half of the door area above and below in a 3-bolt group. The top dnd bottom bolts would therefore receive half the load applied to the central bolt, with the central bolt being the limiting factor
The blast load is limited by the shear capacity of one bolt - therefore the total allowable blast load is factored by the number of bolts
These figures are the ultimate capacities, with an allowance for dynamic load factors
The above table is a guide to the permissible ‘Peak’ blast loads a device could provide, this is of course dependant on the complete door and frame design, the method of fitting, including the hinge side of the door.