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14 of 21 <br /> Project Number: Plan Name: Sheet Number: <br /> S210421-2XR Foundation Stabilization <br /> Engineer: Subject: Date: <br /> JT Unreinforced Conc Design Check 6/28/21 <br /> DEMAND CALCULATION <br /> number of stories # 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 pif [Includes total height w/o ACI14§14.5.1.7 redux) <br /> Pt DL DL 3.48 k = 8.0 ft *435 [1-story loading] <br /> Pt LL LL 3.20 k = 8.0 ft *400 [1-story loading] <br /> Pt LLr LLr 2.20 k = 8.0 ft *275 [1-story loading] <br /> moment from DL MDL 8,960 lb-ft 107.5 k-in <br /> moment from LL MLL 6,400 lb-ft 76.8 k-in <br /> moment from SL MLL, 4,400 lb-ft 52.8 k-in <br /> factored moment MLRFD 150.5 k-in 1.4DL <br /> MLRFD 278.3 k-in 1.2DL+1.6LL+0.5SL <br /> MLRFD 290.3 k-in 1.20L+1.6SL+LL <br /> controlling factored moment M. 290.3 k-in <br /> factored shear VLRFD 3.8 k 1.4DL <br /> VLRFD 6.4 k 1.2DL+1.6LL+0.5SL <br /> VLRFD 6.6 k 1.2DL+1.6SL+LL <br /> controlling factored shear V. 6.6 k <br /> controlling factored bearing B. 6.6 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 441eR 0.9 tension-controlled ACI14[Table 21.2.1] <br /> shear strength red.factor 4>she,r 0.75 ACI14[Table 21.2.1] <br /> bearing strength red.factor 4.bear;„e 0.65 ACI14[Table 21.2.1] <br /> moment of ineritia I,. 11,016 in4 *see attached <br /> elastic section modulus 5„, 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=5. Sr„ ACI 318-14[Eq.14.5.2.1a] <br /> nom flexure strength(C controls) M„ 2,128.1 k-in tL.--u -!'s._ ACI 318-14[Eq.14.5.2.1b] <br /> RESIDENTIAL CONCRETE Ma 375.5 k-in Mn=7.55/1 S,r, CONTROLS ACI 332-14[Eq.8.2.1.1] <br /> flexure strength 4tM„ 338.0 k-in >Mu OK D/C=85.89% <br /> nom shear strength V„ 14.4 k Un=34 d a A ACI14[Table 14.5.5.1(a)] <br /> shear strength 4'V„ 10.8 k >Vu OK D/C=61.56% <br /> loaded bearing area A, 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 8„ 156.6 k O.85f'A, ACI14[Table 14.5.6.1(c)] <br /> bearing strength 4)B„ 101.8 k >Bu OK D/C=6.53% <br /> Additional Verification talc: <br /> max concrete tensile strength f, 375 psi f =7.54T ACI 14[Eq.19.2.3.1] <br /> max beam tensile stress F, 290 psi FL_(M*c)/ <br /> x. <br /> fr >Ft OK <br />