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Dong Engineering Inc. <br />ADDITION + ADU <br />5121 W.ROBERTS DR, SANTA ANA, CA 92704 <br />Job#: 240056 <br />Date: 2/6/2024 <br />PLAN: 1 <br />CODE: CBC 2022 <br />SECTION: 2X <br />Number of Story: 1 Section width: 27(ft)Section length: 42(ft) <br />Base height: 0(ft)Slope roof height: 13(ft)Gable mean roof height: 10.5(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 = 12(ft), L = 22(ft), H = 10.5(ft)-->L/B = 1.83, H/L = 0.48 <br />Wall coefficient: Cpw = 0.8, Cpl = -0.33, Roof coefficient: Cpw = (-0.04;-0.48), Cpl = -0.57 <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-->Rx = 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/Rx = 0.7*1.066*1*W/6.5 = 0.1148*W <br />Total Seismic Load = 95.28 = 95.28 PLF <br />Redistrib: 830*8 = 6640 PLFxFT <br />DIAPHRAGM & CHORD FORCE PER ASCE07-16 SECTION 12.10 <br />ROOF DIAPHRAGM <br />Max shear = 136.11 x 27 / (2 x 42) = 43.75 PLF <br />Use: 15/32" apa rated unblock 32/16 w/8d common nails at 6", 6", 12" o.c. <br />Chord force = 136.11 x 27^2 / (8 x 42) = 295.31 LBS <br />Splice w/ min. (2) 16d sinker nails each side of splice at 8" o.c. (standard construction) <br />(z, Kz, qz, P): (15, 0.85, 22.35, 21.53) <br />ROOF <br />Roof = 15*42 = 630 PLF <br />Wall = 15*2*4 + 10*2*4 = 200 PLF <br />Shear = 0.1148(630+200) = 0.1148*830 = 95.28 PLF <br />Plate height: ROOF = 8(ft) <br />SHEAR ROOF = 95.28*830*8/6640 = 95.28 PLF <br />SHEAR ROOF = 0.6*W = 81.88(plf) <br />ROOF 95.28 PLF SEISMIC GOVERN <br />8 of 44 <br />FLOOD ZONE - 5121 W <br />Roberts Dr & #23/19/2025