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19 of 34 <br /> Project Number: Plan Name: Sheet Number: <br /> 5210203-1Xu Foundation Stabilization <br /> Engineer: Subject: Date: <br /> ZT Unreinforced Conc Design Check 5/10/2021 <br /> DEMAND CALCULATION <br /> number of stories # 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 614.5.1.7 redux] <br /> Pt DL DL 4.41 k = 6.0 ft *735 [2-story loading] <br /> Pt LL LL 4.80 k = 6.0 ft *800 [2-story loading] <br /> Pt LLr LLr 1.95 k = 6.0 ft *325 [2-story loading] <br /> moment from DL M2L 7,740 lb-ft 92.9 k-in <br /> moment from LL MLL 7,200 lb-ft 86.4 k-in <br /> moment from SL M,u 2,925 lb-ft 35.1 k-in <br /> factored moment MLRFD 130.0 k-in 1.4DL <br /> MLRFD 267.2 k-in 1.2DL+1.6LL+0.5SL <br /> MIRFD 254.0 k-in 1.2DL+1.6SL+LL <br /> controlling factored moment M. 267.2 k-in <br /> factored shear VLRFD 4.1k 1.4DL <br /> VLRFD 7.9 k 1.2DL+1.6LL+0.5SL <br /> Vmrn 7.5 k 1.2DL+1.6SL+LL <br /> controlling factored shear V„ 7.9 k <br /> controlling factored bearing B. 7.9 k [R=V for SS beam] <br /> STRENGTH CALCULATION <br /> concrete strength Pc 2.5 ksi assumed <br /> light wt concrete mod.factor A 1 normal weight concrete <br /> flexure strength red.factor Rex 0.9 tension-controlled ACI14[Table 21.2.1] <br /> shear strength red.factor 4 ,,,, 0.75 ACI14[Table 21.2.1] <br /> bearing strength red.factor 43be,,;„x 0.65 ACI14[Table 21.2.1] <br /> moment of ineritia Ix, 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 M„=52 . .S„, ACI 318-14[Eq.14.5.2.1a] <br /> nom flexure strength(C controls) M, 2,128.1 k-in )1 -it,.:Si.s. ACI 318-14[Eq.14.5.2.1b] <br /> RESIDENTIAL CONCRETE Mn 375.5 k-in M„=7.552S,„ CONTROLS ACI 332-14[Eq.8.2.1.1] <br /> flexure strength 4Mn 338.0 k-in >Mu OK D/C=79.07% <br /> nom shear strength V" 14.4 k V=3 A,�*A ACI14[Table 14.5.5.1(a)] <br /> shear strength 4'Vn 10.8 k >Vu OK D/C=72.90% <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 B" 156.6k 0.ti5f;'.1, ACI14[Table 14.5.6.1(c)] <br /> bearing strength 4)13n 101.8 k >Bu OK D/C=7.73% <br /> Additional Verification Colo: <br /> max concrete tensile strength f, 375 psi f,=7.54 ACI 14[Eq.19.2.3.1] <br /> max beam tensile stress F, 267 psi Ft=CM*c) <br /> /Ixx <br /> fr >Ft OK <br />