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16 of 23 <br /> Project Number: Plan Name: Sheet Number: <br /> S220112-3XR Foundation Stabilization <br /> Engineer: Subjcct: Date: <br /> 1T Unreinforced Cone Design Check 4/13/22 <br /> DEMAND CALCULATION <br /> number of stories 8 2 stories <br /> span L 6.0 ft [max on-center pile spacing] <br /> concrete area A 216 in2 "see attached <br /> concrete self weight SW 250 plf [Includes total height w/o ACI14 414.5.1.7 redux] <br /> Pt DL DL 5.04 k = 6.0 ft '840 [2-story loading] <br /> Pt LL LL 6.24 k = 6.0 ft •1040 [2-story loading] <br /> Pt LLr LLr 2.40 k = 6.0 ft a 400 [2-story loading] <br /> moment from DL Mot 8,685 lb-ft 104.2 k-in <br /> moment from LL MLL 9,360 lb-ft 112.3 k-in <br /> moment from SL Mar 3,600 lb-ft 43.2 k-in <br /> factored moment MwF5 145.9 k-in 1.4DL <br /> MLaro 326.4 k-in 1.2DL+1.6LL+0.5SL <br /> MuaF° 306.5 k-in 1.201+1.65L+LL <br /> controlling factored moment M. 326.4 k-in <br /> factored shear VLRFD 4.6 k 1.4DL <br /> VLavo 9.5 k 1.2DL+1.6LL+0.5SL <br /> limo 9.0 k 1.2DL+1.6S1.+LL <br /> controlling factored shear V. 9.5 k <br /> controlling factored bearing B„ 9.5 k [R=V for SS beam] <br /> STRENGTH CALCULATION <br /> concrete strength f'c 2.5 ksi assumed <br /> light wt concrete mod.factor A 1 normal weight concrete <br /> flexure strength red.factor Qttiex 0.9 tension-controlled ACI14[Table 21.2.1] <br /> shear strength red.factor epshear 0.75 ACI14[Table 21.2.1] <br /> bearing strength red.factor ¢bear+„a 0.65 ACI14[Table 21.2.1] <br /> moment of ineritio I,u 11,016 in4 'see attached <br /> elastic section modulus S,e 1,001 in3 "see attached <br /> tens fiber to NA c 11.0 in "see attached <br /> nom flexure strength(T controls) Ma 250.4 k-in Mn=52V/ sm AC1318-14[Eq.14.5.2.1a] <br /> c <br /> nom flexure strength(Ccontrols) M, 2,128.1 k-in tt _p gi/'5,., ACI 318-14[Eq.14.5.2.1b] <br /> RESIDENTIAL CONCRETE Mn 375.5 k-in Mn=7.551Sm CONTROLS Ad'332-14[Eq.8.2.1.1] <br /> flexure strength I OW 338.0 k-in >Mu OK I D/C=96.56% <br /> nom shear strength V„ 14.4 k V 31=4V ` <br /> I *A ACI14[Table 14.5.5.1(a)] <br /> shear strength I 4IV 10.8 k >Vu OK I D/C=88.11% <br /> loaded bearing area Al 74 in2 [IDEAL 2-7/8"Tru-Force Underpinning Bracket] <br /> supporting surface bearing area A2 74 in2 [If the supporting surface is>than loaded area] <br /> nom bearing strength B„ 156.6 k O.8V,,'A, ACI14[Table 14.5.6.1(c)] <br /> bearing strength I 4)B„ 101.8 k >Bu OK I D/C=9.35% <br /> Additional Verification Calc: <br /> max concrete tensile strength f, 375 psi f=751' ACI 14[Eq.19.2.3.1] <br /> max beam tensile stress F, 326 psi Ft=(M*c)/L <br /> zx <br /> f, >Ft OK <br />