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14 of 21 <br /> Project Number: Plan Name: Sheet`umber: <br /> S2210O6-2XR _ Foundation Stabilization <br /> Engineer: Subject: Date: <br /> IT Unreinforced Conc Design Check 1 1/]9/22 <br /> DEMAND CALCULATION <br /> number of stories 8 1 stories <br /> span L 8.0 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§14.5.1.7 redux] <br /> Pt DL DL 3.84 k = 8.0 ft *480 [1-story loading] <br /> Pt LL LL 3.20 k = 8.Oft *400 [1-story loading] <br /> Pt LLr LLr 2.80 k = 8.Oft *350 [1-story loading] <br /> moment from DL MDL 9,680 lb-ft 116.2 k-in <br /> moment from LL Mti 6,400 lb-ft 76.8 k-in <br /> moment from SL Milt 5,600 lb-ft 67.2 k-in <br /> factored moment MRCP 162.6 k-in 1.4DL <br /> Mua, 295.9 k-in 1.2DL+1.6LL+0.5SL <br /> MmFD 323.7 k-in 1.2DL+1.6SL+LL <br /> controlling factored moment M. 323.7 k-in <br /> factored shear VLRFD 4.1 k 1.4DL <br /> VD,FD 6.8 k 1.2DL+1.6LL+O.SSL <br /> VLRFn 7.3 k 1.2DL+1.6SL+LL <br /> controlling factored shear V. 7.3 k <br /> controlling factored bearing B. 7.3 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 doe, 0.9 _tension-controlled ACI14[Table 21.2.1] <br /> shear strength red.factor Ch., 0.75 ACI14[Table 21.2.1] <br /> bearing strength red.factor tbse,r;,g 0.65 ACI14[Table 21.2.1) <br /> moment of ineritia I„, 11,016 in4 *see attached <br /> elastic section modulus S,,, 1,001 in3 *see attached <br /> tens fiber to NA c 11.0 in *see attached <br /> nom flexure strength(T controls) M„ 250.4 k-in M„=5dcS,„ ACI 318-14[Eq.14.5.2.1a] <br /> nom flexurestrength(Ccontrols) Mn 2,128.1 k-in M„-0.85f'S„ ACI 318-14[Eq.14.5.2.1b] <br /> RESIDENTIAL CONCRETE M, 375.5 k-in M„=7.55ASm CONTROLS ACI 332-14[Eq.8.2.1.1] <br /> flexure strength 4'M„ 338.0 k-in >Mu OK D/C=95.78% <br /> nom shear strength V, 14.4 k Vn=3 c 4 x *A ACI14[Table 14.5.5.1(a)] <br /> shear strength 4)V„ 10.8 k >Vu OK D/C=68.00% <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.85f;:9, ACI14[Table 14.5.6.1(c)] <br /> bearing strength GB„ 101.8 k >Bu OK D/C=7.21% <br /> Additional Verification Calc: <br /> max concrete tensile strength f, 375 psi f =7.5d c� ACI 14[Eq.19.2.3.1] <br /> r <br /> max beam tensile stress F, 323 psi Ft=(M*c)/f <br /> xx <br /> fr >Ft OK <br />