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13 of 21 <br /> Project Number: Plan Name: Sheet Number: <br /> S200608.3 Foundation Stabilization <br /> Engineer: Subject: Datc: <br /> ZT Unreinforced Conc Design Check 9/11/2020 <br /> DEMAND CALCULATION <br /> number of stories 77 2 stories <br /> span L 7.0 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 3.92 k = 7.0 ft *560 [2-story loading] <br /> Pt LL LL 5.60 k = 7.0 ft *800 [2-story loading] <br /> Pt LLr LLr 0.70 k = 7.0 ft * 100 [2-story loading] <br /> moment from DL MDL 8,391 lb-ft 100.7 k-in <br /> moment from LL M. 9,800 lb-ft 117.6 k-in <br /> moment fromSL MLL, 1,225 lb-ft 14.7 k-in <br /> factored moment MLRFD 141.0 k-in 1.4DL <br /> MLRFD 316.3 k-in 1.2DL+1.6LL+0.5SL <br /> WRFC) 262.0 k-in 1.2DL+1.6SL+LL <br /> controlling factored moment Mn 316.3 k-in <br /> factored shear VLRFD 4.0 k 1.4DL <br /> VLRFD 8.1 k 1.2DL+1.6LL+0.SSL <br /> VLRFD 6.8 k 1.2DL+1.6SL+LL <br /> controlling factored shear V. 8.1 k <br /> controlling factored bearing B. 8.1 k [R=V for SS beam] <br /> STRENGTH CALCULATION <br /> concrete strength Pc 2.5 ksi assumed <br /> light wt concrete mod.factor IL 1 normal weight concrete <br /> flexure strength red.factor Off. 0.9 tension-controlled ACI14[Table 21.2.1] <br /> shear strength red.factor ,4,near 0.75 ACI14[Table 21.2.1] <br /> bearing strength red.factor W6earing 0.65 ACI14[Table 21.2.1] <br /> moment of ineritio 1,0, 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) Mn 250.4 k-in Mn=51 m ACI 318-14[Eq.14.5.2.1a] <br /> nom flexure strength(C controls) Mn 2,128.1 k-in .1/.-O.S5I'S.. ACI 318-14[Eq.14.5.2.1b] <br /> RESIDENTIAL CONCRETE Mn 375.5 k-in Mn=7.5514, CONTROLS ACI 332-14[Eq.8.2.1.1] <br /> flexure strength 4.M❑ 338.0 k-in >Mu OK D/C=93.60% <br /> 4 <br /> nom shear strength Vn 14.4 k y„=-3AVr c.A ACI14[Table 14.5.5.1(a)] <br /> shear strength 4pVn 10.8 k >Vu OK D/C=74.60% <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 Bn 156.6 k 0.h3/,'.'I• ACI14[Table 14.5.6.1(c)] <br /> bearing strength 4iBn 101.8 k >Bu OK D/C=7.91% <br /> Additional Verification Calc: <br /> max concrete tensile strength fr 375 psi f,.=7.51 ACI 14[Eq.19.2.3.1] <br /> max beam tensile stress F, 316 psi Ft=(M*c)/ <br /> Ixx <br /> fr >Ft OK <br />