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• 8_ll-20 ROBERT JAMES&ASSOCIATES,Inc. Sht.5 of 5 <br /> Check tensile stress of concrete at pole <br /> Compressive Strength of Concrete: (psi) fc= 3000 <br /> 1 / 1 <br /> Overturning moment at pole: (ftlbs./ft) Mp I 2FJ 2 I qaJ Mp=754.519 <br /> Section modulus of footing -Per foot of width: (in.3) Sw:= 12.(DF•12)2 Sw=2592 <br /> 6 <br /> Tensile stress in concrete: (psi.) ft:= (Mp•12) ft=3.493 <br /> SW <br /> Allowable stress in concrete: (psi.) -�Ft:= 0.65•(5•\Ffe) (�Ft= 178.01 > ft=3.493 <br /> REBAR NOT REQUIRED FOR STRESS <br /> Design of temperature and shrinkage steel <br /> Rebar size: Number:= 3 <br /> ,,r (Numberl2 <br /> RebarArea: (in.2) Area:= 8 J Area=0.11 <br /> 4 <br /> For length of footing: Asl:= 0.0018-BF-WF•144 Asl=2.851 <br /> Number required: Asl =25.815 Use sixteen(16)#3 Rebar x 2'-6"LG.equally spaced top and bottom <br /> Area using 3"typical clear. (Thirty-two(32)total required.) <br /> For width of footing: Asw:= 0.0018•BF•LF•144 Asw=0.389 <br /> Number required: Asw =3.52 Use four(4)#3 Rebar x 21'-6"LG.equally spaced top and bottom <br /> Area using 3"typical clear. (Eight(8)total required) <br /> Quantity of concrete: (Y ds 3 C r(LF WF DF)l <br /> ) Y:= L 27 J Cy=7.333 <br /> Note: Use a 1"thick x 12"square concrete pavers at the bottom of the footing, <br /> to rest the poles on,for water exclusion. <br />