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Seismic Load Check <br /> (max) Sds = 2.0 <br /> I = 1.0 <br /> Non Structural Components (ASCE 7-16, TABLE 13.6-1) <br /> (Rp = 1.5, ap = 1.0) ….. Mechanical or electrical components <br /> Fp = (0.4 x ap x Sds x Ip / Rp) x (1 + 2 x z / h) x Wp <br /> = (0.4 x 1.0 x Sds x 1.0 / 1.5) x (1 + 2 x z / h) x Wp <br /> = 0.8 x Sds x Wp = 0.8 x 2.0 x Wp = 1.6 x Wp … Governs <br /> Fp (min) = 0.3 x Sds x Wp, Fp(max) = 1.6 x Sds x Wp <br /> Design Load = 1.6 Wp x 0.7 = 1.12 Wp (allowable stress design) <br /> Fp (shear force per lag screw) = 1.12 x 3.0 psf x 11 sq.ft = 37 lbs < Fpallow = 130 <br /> Seismic Load Check O.K. <br /> Check Seismic Force Increase Due to Solar Panel Weight: CBC Sec. 3404.A4 <br /> V (base shear) = Sds x I / R x W = CW <br /> Unit Seismic Load (w) = C (15 psf + 15 psf / 2 x 2) = C x 30 psf when there are no solar <br /> panels. <br /> Unit Seismic Load (w’) = C (15 psf + 3 psf + 15 psf / 2 x 2) = C x 33 psf when there are <br /> solar panels. <br /> Increase Ratio = C x 33 / C x 30 = 1.1 <br /> Max 10% increase when entire roof is covered with solar panels <br /> However, not entire roof is covered with solar panels <br /> Therefore, the increase of seismic force due to solar panel weight is less than 10% – O.K. <br /> design@irfanengineering.com Irfan Engineering LLC <br />1711 N Park Ln- 101120149 & <br />201834587/26/2024