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) as sea <br /> CALCULATIONS FOR FREESTANDING SIGNS <br /> M.. easysealscom <br /> Footing Design for Freestanding Signs and Flagpoles <br /> Structure Dimensions & Loading <br /> Design wind pressure: P= 24.7 psf <br /> Overturning Safety Factor: O= 1.5 ...FBc 1807.2.3 <br /> Sign area 1: A1= 26.6 sq ft ...tributary area 1 for each footer(e.g.sign) <br /> Height of applied force above grade: h1= 3.0 ft ...height of area 1 centroid <br /> Sign area 2: A2= 44.1 sq ft ...tributary area 2 for each footer(e.g.post) <br /> Height of applied force above grade: h2= 4.9 ft ...height of area 2 centroid <br /> Overturning Moment: Mn = P*(A1*h1+A2*h2) <br /> Mn= 7.3 kip-ft <br /> Sq/Rect Footing dimensions: B= 2.33 ft L= 5.5 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*B*L*ds <br /> Footing weight: Df= 7689 lb ...=150pcf*B*L*d <br /> Tota I weight: D= 7889 lb ...=Dr+Ds+Df <br /> Soil Strength ...FBCTables 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 /> Si= 2*Plat* (d+ds)/3 <br /> S1= 400 psf <br /> Total applied lateral load: Ptot= 1.74 kips <br /> Equiv ht of applied load: heq= 4.17 ft <br /> As= 2.34*Ptot/(S1*L) <br /> As= 1.9 ft <br /> dreq = As/2 * [ 1+V(1+4.36*heq/As) ] <br /> dreq = 3.97 ft dreq<d OK <br /> Page 3 <br />