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STRUCTURAL SOLUTIONS, —. P:A. Project Amarr Garage Doors No.: 2K - 014 <br /> 5509 West Friendly Avenue; Suite 103 Location Winston - Salem,. NC <br /> Greensboro, North Carolina 27410 <br /> (336) 856 - 2686 Date 9/11/00 Sheet J of 1 <br /> From Thomas L. Shelmerdine, PE <br /> Comparison of T High Doors versus 6 High Doors <br /> The doors used in the tests are 7' high doors. These calculations show that 6' -6" high doors of <br /> similar construction are structurally adequate. <br /> The difference between the 7' Door and the 6'x6" Door is the size of the sections. The 7' Door has <br /> (4) -21" high sections, where the 6'-6" Door has (2) -21" and (2) -18" sections. The size and quantity <br /> of struts, stiles, hinges, jamb brackets, and rollers are the same. <br /> The design pressures and test pressures for "Components" as defined in the Building Code vary with <br /> the surface area of the item under investigation. The larger the area, the lower the pressure. <br /> Therefore, the required test pressure for the 6 Door is slightly larger than the 7' Door. The <br /> difference is 1 to 2 percent. Let's say it is 5% larger for the 6' -6" Door. <br /> Let's compare the actual load on each element of the doors. The tributary height per hinge is 21" <br /> for the 7' Door, versus (21 +18)/2 = 19.5" for the 6' -6" Door. Therefore, the load per hinge is 19.5/21 <br /> x 105% = 97.5% of the 7' Door. The actual Toad to be resisted by the hinge is less for the 6' -6" Door. <br /> This comparison of tributary height also applies to the struts, rollers, jamb brackets and other <br /> elements of the doors. <br /> CONCLUSION <br /> The 6'-6" High Door is structurally adequate as compared to the 7' High Door. <br /> -17- . : i*; 4 � r�, s " <br /> f o r lit " <br /> 0 � + ,� <br /> r„. lit • a e •., J L <br /> • <br />