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Calculations for Coastal Sign Installation LLC , <br /> Zephyr Commons job#09914CSI 21'9" 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: � <br /> Ultimate design wind speed,figure C,FBC 2010,section 1609: 130 mph <br /> Wind stagnation pressure(qz)Table 1609.6.2(1)FBC 2010 43.3 psf <br /> Design wind pressure conversion factor ���� <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) 9.75 <br /> Overall height of sign(H) 2�.�5 <br /> Aspect ratio(B/s) 3.18 <br /> Clearance ratio(s/H) 0.45 <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 39.7 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 9.8 1.0 287.1 39.7 11392 12.9 146677 <br /> 2.7 12.0 1.0 32.0 39.7 1271 6.0 7627 <br /> 0.0 39.7 0 0 <br /> 0.0 39.7 0 0 <br /> Total 319.2 12664 12.2 154305 <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)= 6 ft (S1)= 1800 psf <br /> -number of posts= 2 Load per post(P)= 6332 <br /> -from p.5-81,Structural Engineering Handbook: <br /> D=((1.18"P)/(b'S1))"(1+(SQRT(1+(1.88"b*S1�H/P)))) ,��t�111I���j�, <br /> assume b(ft)= 3 ���� �R /�j <br /> p(ft)= 7.7 �� � �'.....,�/� �j <br /> Alternatively,Section 1807.3.2.1, Equation 18-1 `���Q�`;��C,ENSF•.������ <br /> A=2.34P/S1*b= 2.74 � �j , ,, <br /> D=0.5A((1+��+(4.36h/A))^0.5)= 7.6 feet � :° �p 004�(�d�a •�' � <br /> :� <br /> 4.Determine required section modulus(in^3)at base � *� �` :�� <br /> max stress=(P*(H)*12)/section modulus ';-�}: :��� <br /> max stress<allowable stress �S1•; ST%��-L �F ,•<(/� <br /> for outdoor signs,allowable stress<(0.66)(yield strength) �Q�•, ,c v�;%�'�', <br /> steel grade A53grB �� �' •�O��.. �? � <br /> .• C1 • <br /> yield strength 32000 psi ���is �pNAL��•`�, <br /> required section>(P'(H)*12)/((0.66*ys)) � � <br /> � 11111t <br /> At base,minimum section modulus= 43.84 in^3 <br /> Use 12"SCH40 steel pipe, section modulus= 47.10 in^3 <br /> References:Structural Engineering Handbook,Gaylord&Gaylord editors, Q����� <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 /> John J Orlando PE 0044089 <br /> 165 Old Ridge Road <br /> Macon GA 31211 <br /> (478)784-2226 <br />