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� 5��� CALCULATIONS FOR FREESTANDING SIGNS <br /> M.. easysealsmm <br /> Footing Design for Freestanding Signs and Flagpoles <br /> Structure Dimensions & Loading <br /> Design wind pressure: P= 24.7 psf <br /> Overturning Safety Factor: Q= 1.5 FBC 1807.2.3 <br /> Sign area 1: A1= 36.0 sq ft ...tributary area 1 for each footer(e.g.sign) <br /> Height of applied force above grade: h1= 3.4 ft ...height of area 1 centroid <br /> Sign area 2: A2= 0.0 sq ft ...tributary area 2 for each footer(e.g.post) <br /> Height of applied force above grade: h2= 0.0 ft ...height of area 2 centroid <br /> Overturning Moment: Mn = P*(A1*h1+A2*h2) <br /> Mn = 3.0 kip-ft <br /> Round Footing Diameter: B= 3 ft <br /> Footing depth: d = 4 ft Soil cover: ds= 0 ft <br /> Superstructure weight: Dr= 200 lb <br /> Soil cover weight: Ds= 0 lb ...=100pcf*r[*B^2/4*ds <br /> Footing weight: Df= 4241 lb ...=150pcf*n*B^2/4*d <br /> Total weight: D= 4441 lb ...=Dr+Ds+Df <br /> Soil Strength ...FBC Tables 1806.2,1819.6 <br /> Soil class: 4.Sand,silty sand,silty gravel <br /> Lateral bearing strength: Plat= 150 psf/ft <br /> Vertical bearing strength: Pbrg= 2000 psf <br /> Check Lateral Soil Bearing Pressures (Empirical Method) ...FBC Sect 1807.3.2.1 <br /> Unconstrained (No rigid floor or pavement at ground surface) <br /> Allowable lateral soil bearing pressure at 1/3 depth: <br /> S1= 2*Plat* (d+ds)/3 <br /> S1= 400 psf <br /> Total applied lateral load: Ptot= 0.89 kips <br /> Equiv ht of applied load: heq = 3.40 ft <br /> As= 2.34*Ptot/(S1*B) <br /> As= 1.7 ft <br /> dreq = As/2 * [ 1+V(1+4.36*heq/As)] <br /> dreq = 3.54 ft dreq<d OK <br /> Page 3 <br />