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STRUCTURAL SOLUTIONS, P.A. Project Amarr Garage Doors - No.: 2K -014 <br /> 5508 -B West Friendly Avenue, Suite 103 Location Winston - Salem, NC <br /> Greensboro, North Carolina 27410 <br /> (336) 856 -2686 Date 9/11/00 Sheet 1 of 1 <br /> From Thomas L. Shelmerdine, PE <br /> Comparison of 16'x7', 16'x7' -6" and 16'x8' doors <br /> The 16'x7' door is the size used in the tests. These calculations show that the 16'x7' -6" and 16'x8' doors <br /> of similar construction are structurally adequate. <br /> The components that are different are tabulated below. <br /> ITEM 16'x7' 16'x7' -6" I 16'x8' <br /> Number of Sections 4 5 5 <br /> Section Size 4 @ 21" each 5 @ 18" each 2 @ 21 ", 3 @ 18" <br /> Number of Struts 8 10 10 <br /> Number of Rollers 5 6 6 <br /> Number of Jamb Brackets 4 5 5 <br /> Number of Hinges 3 per Stile 4 per Stile 4 per Stile <br /> Surface Area 112 sq. ft. 120 sq. ft. 128 sq. ft. <br /> Test Pressure "X" psf Less Than "X" Less Than "X" <br /> The design pressures and test pressures for "Components" as defined in the Building Code vary with the <br /> surface area of the item under investigation. The larger the area, the lower the pressure. Therefore, the <br /> required test pressures for the 16'x7' -6" and 16'x8' doors are Tess than the tested door. <br /> The size of each section in the 16'x7' -6" and 16'x8' doors are identical to or smaller than the sections in the <br /> 16'x7' door. Therefore, each section of the 16'x7' -6" and 16'x8' doors are required to resist less Toad than <br /> the tested door. <br /> Each of the four sections has two reinforcing struts on the 16'x7' door. The 16'x7' -6" and 16'x8' doors have <br /> two struts on each of five sections. Therefore there are two more struts on the 16'x7' -6" and 16'x8' doors. <br /> The resulting tributary areas per strut on the 16'x7' -6" and 16'x8' doors are equal to or less than the tributary <br /> area per strut on the 16'x7' door. Therefore, each strut on the 16'x7' -6" and 16'x8' doors is required to resist <br /> Tess Toad. <br /> This comparison of tributary area also applies to the rollers, hinges and jamb brackets. <br /> CONCLUSION , wit ofii �s <br /> Each element of the 16'x7' -6" and 16'x8' doors is required to resist less pressuq r s,eSileke l fbe <br /> 16x7' door. Therefore, the 16'x7' -6" and 16'x8' doors are structurally adequate , - lila. -,n$901:4,;•.' <br /> t. <br /> 7 <br /> Yid b'. <br /> 2 <br />