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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.
