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t�(X/ <br /> Job name 9'0I3'Rentals <br /> Job# 3918RS <br /> Company: Rogers'Sign Corp. ;t� <br /> Installation location: 5906 7th St Zephyrhills,_FL <br /> - -- ••......°• <br /> Section 3107-and 1609 of Florida Building Code 2017 applies: �� ® : •OC+E�S • O �e <br /> Chapter 29 of ASCE 7-10(Wind Loads on Other Structures and Building Appurtances)applies: 'o® �;• �' F •°;o �s <br /> NO 0044089 S <br /> Type of structure: pylon *. <br /> Risk Category: a <br /> Ultimate design wind speed,figure C,FBC 2017,section 1609: _40 , mph <br /> Wind stagnation pressure(qz)per 1609.6.3 FBC 2017 50.2 psf ®o STATE OF <br /> Design wind pressure conversion factor 0.77 ��.p••��` <br /> i !e <br /> Gust effect factor(G)ASCE 7-10 26.9.1 0.85 <br /> Widest <br /> part of sign <br /> (s)a(B) 50 <br /> Height <br /> Overall height of sign(H) 6.00 <br /> Aspect ratio(B/s) 1.08 <br /> Clearance ratio(s/H) 1.00 <br /> Force Coefficient Cf from Figure 29.4-1,ASCE 7-10 1.4 <br /> Wind pressure(p)multiplied by design wind pressure conversion factor and Cf 46.0 psf <br /> 2.Calculate wind load and turning moments at base by the provisions of the alternate all-heights method <br /> in Section 1609.6. Wind shall be assumed to come from any horizontal direction and <br /> wind pressures shall be assumed to act normal to the surface considered. <br /> Hor Dim Vert Dim Fill Factor Af p F H M(base) <br /> (ft) (ft) (so (Ibs) (ft) (ft-Ibs) <br /> 6.5 6.0 1.0 39.0 46.0 1794 3.0 5382 <br /> 0.0 46.0 0 0.0 0 <br /> 0.0 46.0 0 0 <br /> 0.0 46.0 0 0 <br /> Total 39.0 1794 3.0 5382 <br /> 3.Determine depth of embedment,D in feet <br /> From Table 1806.2,class 4,sandy soil,lateral bearing pressure below grade= 150 psf/ft <br /> Per 1806.3.4 Increase for poles,tabular value time 2 = 300 psf/ft <br /> Assume depth of hole(D)= 4 ft (Si)= 1200 psf <br /> -number of posts= 1 Load per post(P)= 1794 <br /> -from p.5-81,Structural Engineering Handbook: <br /> D=((1.18*P)/(b*S1))*(1+(SQRT(1+(1.88*b*S 1*H/P)))) <br /> assume b(ft)= 2 <br /> D(ft)= 3.5 <br /> Alternatively,Section 1807.3.2.1,Equation 18-1 <br /> A=2.34P/S1*b= 1.75 <br /> D=0.5A((1+(1+(4.36h/A))^0.5)= 3.4 feet <br /> 4.Determine required section modulus(in A3)at base <br /> max stress=(P*(H)*12)/section modulus <br /> max stress<allowable stress <br /> for outdoor signs,allowable stress<(0.66)(yield strength) <br /> material A53GrB <br /> yield strength(modulus of rupture) 35000 psi <br /> required section>(P*(H)*12)/((0.66*ys)) <br /> At base,minimum section modulus= 2.8 inA3 <br /> Use 4"SCH40 pipe, section modulus(Wx)= 3.2 inA3 <br /> References:Structural Engineering Handbook,Gaylord&Gaylord editors, <br /> Fourth edition,McGraw Hill, NY 1997 <br /> ASCE 7 10 <br /> The 6th Edition(2017)of the Florida Building Code <br /> Mechanics of Materials,Beer and Johnston,McGraw Hill,NY 1981 <br /> ICBO Evaluation Report No.4016 <br /> SBCCI Compliance Report No.9368 <br /> Standard Handbook for Mechanical Engineers,T.Baumeister and - <br /> -L,S.Marks;editors,.Seventh edition;_McGraw-Hill,NY 1967- - - - - - - - -- -sheet_3-of3---- -----•- <br /> John J Orlando PE 0044089 <br /> 165 Old Ridge-Road <br /> Macon GA 31211 <br /> (478)784-2226 <br />