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Calculations for Coastal Sign Installation LLC <br /> Zephyr Commons job#02914CSI 17'7" OAH ground sign foundation and pole size calculations . <br /> To be installed at 7838 Gall Blvd,Zephyrhills, FL . <br /> Section 3107 and 1609 of Florida Building Code 2010 applies: <br /> Chapter 29 of ASCE 7-10(Wind Loads on Other Structures and Building Appurtances)applies: <br /> Type of structure: pylon sign <br /> Occupancy Category: II <br /> Ultimate design wind speed,figure C, FBC 2010,section 1609: 140 mph <br /> Wind stagnation pressure(qz)Table 1609.6.2(1)FBC 2010 50.2 psf <br /> Design wind pressure conversion factor 0,77 <br /> Gust effect factor(G)ASCE 7-10 26.9.1 0.85 <br /> Widest part of sign face(B) 31.00 <br /> Height of sign face(s) 9.58 <br /> Overall height of sign(H) 17.58 <br /> Aspect ratio(B/s) 3.24 <br /> Clearance ratio(s/H) 0.54 <br /> Force Coefficient Cf from Figure 29.4-1,ASCE 7-10 1.4 <br /> Wind pressure(p)multipiied 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) (s� (Ibs) (ft) (ft-Ibs) <br /> 31.0 9.6 1.0 282.1 46.0 12978 8.8 114073 <br /> 2.7 8.0 1.0 21.4 46.0 983 4.0 3930 <br /> 0.0 46.0 0 0 <br /> 0.0 46.0 0 0 <br /> Total 303.5 13960 8.5 118003 <br /> 3. Determine depth of embedment, D in feet <br /> From Table 1806.2,sandy soil, lateral bearing pressure below grade(S1)= 400 psf/ft <br /> Assume depth of hole(D)= 5 ft (S1)= 2000 psf <br /> -number of posts= 2 Load per post(P)= 6980 <br /> -from p.5-81,Structural Engineering Handbook: <br /> D=((1.18*P)/(b"S 1))"(1+(SQRT(1+(1.88*b'S 1*H/P)))) <br /> assume b(ft)= 3 <br /> D(ft)= 6.6 <br /> 4. Determine required section modulus(in^3)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 /> steel grade A53gr6 <br /> yield strength 32000 psi <br /> required section>(P*(H)*12)/((0.66*ys)) <br /> At base,minimum section modulus= 33.52 in^3 <br /> Use 12"SCH40 steel pipe, section modulus= 47.10 in^3 � <br /> References:Structural Engineering Handbook,Gaylord&Gaylord editors, <br /> Fourth edition,McGraw Hill,NY 1997 <br /> ASCE 7 <br /> Florida Building Code 2007 with 2009 supplements <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 of 3 <br /> 4t4tIf111t1j1 <br /> :f: bR� ���I� <br /> �::i:.... q � <br /> �.��,��.��E Nsc�•;���''„'r. <br /> � � Nb 00440C�3 <br /> 4 <br /> �' � ' .. <br /> � �fiQT� nr . ' <br /> John J Orlando PE 0044089 • d.�+��� ,, : � ;y <br /> � <br /> 165 Old Ridge Road �i'l� 'j����F'� 1 �i:� ;'� <br /> Macon GA 31211 / /%y���s•••••��,; � ;e <br /> (478)784-2226 (�Y�d�` j i�ri i�ii�t <br />