Company Address City, State Phone JOB TITLE Snow Example 3 JOB NO. SHEET NO. CALCULATED BY DATE CHECKED BY DATE www.struware.com CS12 Ver 2014.09.01 STRUCTURAL CALCULATIONS FOR Snow Example 3 ASCE 7-10 Commentary Company JOB TITLE Address City, State Phone JOB NO. Snow Example 3 SHEET NO. CALCULATED BY DATE CHECKED BY DATE www.struware.com Code Search Code: ASCE 7 - 10 Occupancy: Occupancy Group = B Business Risk Category & Importance Factors: Risk Category = II Wind factor = Snow factor = Seismic factor = 1.00 1.00 1.00 Type of Construction: Fire Rating: Roof = Floor = 0.0 hr 0.0 hr Building Geometry: Roof angle (θ) Building length (L) Least width (B) Mean Roof Ht (h) Parapet ht above grd Minimum parapet ht 0.00 / 12 100.0 ft 100.0 ft 30.0 ft 0.0 ft 0.0 ft 0.0 deg Live Loads: Roof 0 to 200 sf: 20 psf 200 to 600 sf: 24 - 0.02Area, but not less than 12 psf over 600 sf: 12 psf Floor: Typical Floor Partitions 100 psf N/A Company JOB TITLE Address City, State Phone JOB NO. Type of Roof Higher Roof 0.0 deg 100.0 ft 100.0 ft Monoslope Ground Snow Load DATE CHECKED BY DATE ASCE 7-10 Monoslope 40.0 psf = II I I = 1.0 0.8 Thermal Factor Ct = 1.00 1.20 Exposure Factor Ce = 0.9 1.0 = 25.2 psf no 26.9 psf no Cs = Ps = 1.00 25.2 psf 1.00 26.9 psf Rain on Snow Surcharge Angle Code Maximum Rain Surcharge Rain on Snow Surcharge = Ps plus rain surcharge = Minimum Snow Load Pm = 2.00 deg 5.0 psf 0.0 psf 25.2 psf 20.0 psf 3.40 deg 5.0 psf 0.0 psf 26.9 psf 16.0 psf Uniform Roof Design g Snow Load = Building Official Minimum = 25.2 p psf 26.9 p psf Importance Factor Pf = 0.7*Ce*Ct*I*Pg Unobstructed Slippery Surface Sloped-roof Factor Balanced Snow Load Leeward Snow Drifts - from adjacent higher roof Upper roof length Snow density Balanced snow height hc/hb >0.2 = 6.1 Adj structure factor Drift height (hd) Drift width Surcharge load: Balanced Snow load: lu = 100.0 ft g = 19.2 pcf hb = 1.40 ft hc = 8.60 ft Therefore, design for drift = 1.00 = 3.81 ft w = 15.23 ft pd = γ*hd = 73.1 psf = 26.9 psf 100.0 psf Windward Snow Drifts - from low roof against high roof Lower roof length Adj structure factor Drift height Drift width Surcharge load: Balanced Snow load: lu = = hd = w = pd = γ*hd = = 170.0 ft 1.00 3.63 ft 14.50 ft 69.6 psf 26.9 psf 96.5 psf Sliding Snow - onto lower roof Sliding snow = 0.4 Pf W = 0.0 plf Distributed over 15 feet = 0.0 psf hd + hb = 1.40 ft 0.0 psf hd + hb < =h therefore sliding snow = Balanced snow load = 26.9 psf Uniform snow load within 15' of higher roof = 26.9 psf Sliding snow not required since upper roof slope is 1/4 in 12 or less Nominal Snow Forces Lower Roof 0.25 / 12 = 1.2 deg 170.0 ft 100.0 ft 10.0 ft 0.0 ft Pg = Risk Category SHEET NO. CALCULATED BY Snow Loads - from adjacent building or roof: Roof slope = Horiz. eave to ridge dist (W) = Roof length parallel to ridge (L) = Projection height (roof step) h = Building separation s = Snow Example 3 40.0 psf NOTE: Alternate spans of continuous beams and other areas shall be loaded with half the design roof snow load so as to produce the greatest possible effect - see code.
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