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Base <br />fo find depth of embedment necessary to resist i� <br />on sign companents. _ _ : <br />- -- ; --- _ _ <br />�� : _ . . <br />JOB NAME PawnFathers Everett' Exposure: B Wind Velocity: 80 <br />Formula for foundation depth: d=A/2(1+ Sq.root of (1+ 4.36h1A) ___ <br />Definition of factors: _ -____ <br />d= depth of embedment in earth (feet) for computation of lateral pressure <br />A = 2.34 PIS,b _ _ <br />b= diagonal dimension of square or rectangular footing (feet) <br />h= distance from grade to point of application of pressure "P" ____ <br />P= Lateral pressure (poundslsquare foot) = area of sign x Wind Pressure I <br />S, = 709.33 (200psf allowable Iaterai soil-bearing pressure per UBC Table 18-I-A x 1.33 x 2 x 1.33) __ <br />b= 2.82 (base size 2' x 2') h= 12 P=14.253 x 31=441.8 S,=709.33 __ _ <br />A= 2.34 x 441.8I709.33 Area of Sign Supported by each pole = 31 <br />A=1.457 -- --- <br />d= 1.45712(1+Sqrtof(1+4.36x1211.457) �I _ <br />d= 1.457l2(1+Sqrtof(1+11.228) - � <br />- d= 1.457/2(1+3.496) _I_ __ <br />— d= 1.45712(4.496) _ <br />d= 1.457/2(4.490") I <br />d= 3.275 � -_ <br />4>3.275, depth OK - ' -.-.---� � — <br />Formula for Wind Pressure: P= Cq x Ce x Qsx Iw <br />C� = 1.4 (pressure coefficient for type of structure, per UBC Table 16-H, 1.4 for Flagpoles, signs, etc.) <br />Co = Exposure factor, per UBC Table 16-G <br />qs = Wind Velocity factor, per UBC l'able 16-F _ ___ _;__ _ <br />Iw = 1(importance factor per UBC Table 16-H) __ _ i__ __ <br />Simplified formula for Wind Pressure = Co x qs x 1.4 I _. _ <br />Center of Sign <br />0-15 feet <br />15-20 feet <br />20-25 feet <br />35-30 feet <br />30-40 feet <br />90 miles/hour <br />rom UBC Table 16-G <br />re B Exposure C _ <br />0.62 1.06 _ <br />0.67 1.13 ___ <br />0.72 1.19 <br />0.76 1.23 <br />0.84 1.31 <br />ted from U8C Table 16F <br />16.4 <br />20.8 <br />Wind Pressure Calculation: <br />Center of sign component is 12' above grade <br />Exposure is B, wind velocity is 80 mph <br />Wind Pressure =.62 x 16.4 x 1.4 =' 14.253 <br />Page 1 <br />� <br />5 <br />