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22 12°1 <br /> Project Number: Plan Name: Sheet Number: <br /> S221012-3XR Foundation Stabilization <br /> Engineer: Subject: Dale: <br /> JT Unreinforced Conc Design Check 12/2/22 <br /> DEMAND CALCULATION <br /> number of stories 6 1 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§14.5.1.7 redux] <br /> PtOL DL 4.05 k = 6.0 ft *675 [1-story loading] <br /> Pt a LL 2.88 k = 6.0 ft *480 (1-story loading] <br /> Pt Llr LLr 3.15 k = 6.0 ft * 525 [1-story loading] <br /> moment from DL Mot 7,200 lb-ft 86.4 k-in <br /> moment from LL Mu. 4,320 lb-ft 51.8 k-in <br /> moment from SL Mti, 4,725 lb-ft 56.7 k-in <br /> factored moment MLRFD 121.0 k-in 1.4DL <br /> MLRFD 215.0 k-in 1.2DL+1.6LL+0.5SL <br /> MIRFD 246.2 k-in 1.2DL+1.6SL+LL <br /> controlling factored moment M„ 246.2 k-in <br /> factored shear VLRFD 3.9 k 1.4DL <br /> VLRFD 6.4 k 1.2DL+1.6LL+O.SSL <br /> VlRFO 7.3 k 1.2DL+1.65E+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 2, 1 normal weight concrete <br /> flexure strength red.factor brie, 0.9 tension-controlled ACI14[Table 21.2.1] <br /> shear strength red.factor l'she,r 0.75 ACI14[Table 21.2.1] <br /> bearing strength red.factor q,be,r;,,g 0.65 ACI14[Table 21.2.1] <br /> moment of ineritia I,,, 11,016 in4 *see attached <br /> elastic section modulus SR, 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 Mn=s j T s, ACI 318-14[Eq.14.5.2.1a] <br /> nom flexure strength(C controls) M 2,128.1 k-in Af._O.Rsf's. ACI 318-14[Eq.14.5.2.1b] <br /> RESIDENTIAL CONCRETE M 375.5 k-in M =7.55 TS„, CONTROLS ACI 332-14[Eq.8.2.1.1] <br /> flexure strength (PM, 338.0 k-in >Mu OK D/C=72.85% <br /> nom shear strength V„ 14.4 k _4�V1 *A ACI14[Table 14.5.5.1(a)] <br /> V <br /> n-3 c <br /> shear strength 4V, 10.8k >Vu OK D/C=67.50% <br /> loaded bearing area Al 74 in2 [IDEAL 2-7/8"Tru-Force Underpinning Bracket] <br /> supporting surface bearing area A, 74 in2 [If the supporting surface is>than loaded area] <br /> nom bearing strength B,, 156.6 k 0.85f'A 1 ACI14[Table 14.5.6.1(c)] <br /> bearing strength 443, 101.8 k >Bu OK D/C=7.16% <br /> Additional Verification talc: <br /> max concrete tensile strength f, 375 psi f =7 54T ACI 14[Eq.19.2.3.1] <br /> r c <br /> max beam tensile stress F, 246 psi Ft=(M*c)/f <br /> xx <br /> f, >Ft OK <br />