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Dong Engineering Inc. <br />ADDITION + ADU <br />5121 W.ROBERTS DR #2, SANTA ANA, CA 92704 <br />Job#: 240056 <br />Date: 11/27/2024 <br />PLAN: 2 <br />CODE: CBC 2022 <br />SECTION: 1Y <br />Number of Story: 1 Section width: 49(ft)Section length: 22(ft) <br />Base height: 0.75(ft)Slope roof height: 14.5(ft)Gable mean roof height: 12.5(ft) <br />WIND PARAMETERS PER ASCE7-16, CHAPTER 27, MWFRS BUILDINGS OF ALL HEIGHTS: <br />Wind speed = 110, Wind exposure = C, Wind importance factor Iw = 1 <br />Coefficients: Kd = 0.85, Kzt = 1, G = 0.85, Gcpi = +/-0.18, omega = 1 <br />B = 49(ft), L = 22(ft), H = 13(ft)-->L/B = 0.45, H/L = 0.59 <br />Wall coefficient: Cpw = 0.8, Cpl = -0.5, Roof coefficient: Cpw = (-0.09;-0.57), Cpl = -0.58 <br />Wind exposure = C-->anpha = 9.5, zg = 900 <br />Kz = 2.01*(15/zg)^(2/anpha)qz = 0.00256*Kz*Kzt*Kd*V^2*Iw P = G(Cpw*qz+Cpl*qh) <br />WIND LOAD: <br />SEISMIC PARAMETERS PER ASCE7-16, CHAPTER 12.8, ELF PROCEDURE: <br />Light frame wood-->Ry = 6.5, Site class :D, SDS = 2FaSs/3 =1.066, SD1 = 2FvS1/3 =0, <br />Seismic design category: D, I = 1, 0.7*V = 0.7*SDS*I*W/Ry = 0.7*1.066*1*W/6.5 = 0.1148*W <br />Total Seismic Load = 60.84 = 60.84 PLF <br />Redistrib: 530*10 = 5300 PLFxFT <br />DIAPHRAGM & CHORD FORCE PER ASCE07-16 SECTION 12.10 <br />ROOF DIAPHRAGM <br />Max shear = 86.91 x 49 / (2 x 22) = 96.79 PLF <br />Use: 15/32" apa rated unblock 32/16 w/8d common nails at 6", 6", 12" o.c. <br />Chord force = 86.91 x 49^2 / (8 x 22) = 1185.63 LBS <br />Splice w/ min. (7) 16d sinker nails each side of splice at 8" o.c. (standard construction) <br />(z, Kz, qz, P): (15.25, 0.85, 22.43, 24.75); (15, 0.85, 22.35, 24.7) <br />ROOF <br />Roof = 15*22 = 330 PLF <br />Wall = 15*2*5 + 10*1*5 = 200 PLF <br />Shear = 0.1148(330+200) = 0.1148*530 = 60.84 PLF <br />Plate height: ROOF = 10(ft) <br />SHEAR ROOF = 60.84*530*10/5300 = 60.84 PLF <br />SHEAR ROOF = 0.6*W = 101.09(plf) <br />ROOF 101.09 PLF WIND GOVERN <br />31 of 44 <br />FLOOD ZONE - 5121 W <br />Roberts Dr & #23/19/2025