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AQX ENGINEERING <br /> STRUCTURAL CALCULATION p 6 <br /> Project: UB-Everett Job No: 2016-SS-014 Calc. No. Rev.: 0 <br /> Subject: Roof Hatch Replacement Discipline: Structural <br /> Impacted Existing Roof Truss <br /> Existing 24"TJ! Truss @ 16"o% <br /> New tributed width, w/cut truss = 1.33 + 1.33/2 = 2 ft <br /> DL= 12 psf x 2ft <br /> SL= 25 psf x 2ft <br /> LLr= 20 psf x 2ft <br /> L P(from roof hatch) —> <br /> DL =300 Ib at 13 ft <br /> 27 ft DL =300 Ib <br /> M max = 9.123 k-ft <br /> 24" TJL truss properties--> <br /> EL= 5x10^6 x (24-1.5) =2531 x 10E6 <br /> E=1800, 1 =1406, S =117.2 <br /> fb = Mmax/S = 9123 x 12"1117.2 = 934 psi <br /> Fb= 2100 x 1.15 (CD) x 1.15 (repetitive) <br /> = 2777 > 934 (OK) <br /> Existing TJL Truss (OK) <br /> 1520 Brookhollow Dr., Suite#45, Santa Ana, CA 92705 Tel: (714)662-05- <br /> Fax: (714)662-05: <br /> ,�C <br />