Laserfiche WebLink
15 of 21 <br /> Project Number: Plan Name: Sheet Number: <br /> S200608-3 Foundation Stabilization <br /> Engineer: Subject: Date: <br /> ZT Unreinforced Conc Design Check 9/11/2020 <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§14.5.1.7 redux] <br /> Pt DL DL 4.31 k = 6.0 ft *717.5 [2-story loading] <br /> Pt LL LL 4.80 k = 6.0 ft *800 [2-story loading] <br /> Pt LLr LLr 2.18 k = 6.0 ft *362.5 [2-story loading] <br /> moment from DL MDL 7,583 lb-ft 91.0 k-in <br /> moment from LL Mu. 7,200 lb-ft 86.4 k-in <br /> moment from SL MLLr 3,263 lb-ft 39.2 k-in <br /> factored moment MLRFa 127.4 k-in 1.4DL <br /> MLRFD 267.0 k-in 1.2DL+1.6LL+0.SSL <br /> MLRFD 258.2 k-in 1.2DL+1.6SL+LL <br /> controlling factored moment M„ 267.0 k-in <br /> factored shear VLRFM 4.1 k 1.4DL <br /> VLRFD 7.9 k 1.2DL+1.6LL+0.5SL <br /> VLRFD 7.6 k 1.2DL+1.6SL+LL <br /> controlling factored shear V„ 7.9 k <br /> controlling factored bearing Be 7.9 k [R=V for SS beam] <br /> STRENGTH CALCULATION <br /> concrete strength fc 2.5 ksi assumed <br /> light wt concrete mod.factor A 1 normal weight concrete <br /> flexure strength red.factor 4Re 0.9 tension-controlled ACI14[Table 21.2.1] <br /> shear strength red.factor lkshear 0.75 ACI14[Table 21.2.1] <br /> bearing strength red.factor bearing 0.65 ACI14[Table 21.2.1] <br /> moment of ineritia Imo, 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) Me 250.4 k-in M„=SAS„, ACI 318-14[Eq.14.5.2.1a] <br /> nom flexure strength(C controls) Mn 2,128.1 k-in t f,,-II` .! ,, ACI 318-14[Eq.14.5.2.1b] <br /> RESIDENTIAL CONCRETE Mn 375.5 k-in M„=7.55A,rFcS„, CONTROLS ACI 332-14[Eq.8.2.1.1] <br /> flexure strength I 4,Mn 338.0 k-in >Mu OK I D/C=79.00% <br /> nom shear strength Vn 14.4 k v„=3 A *A ACI14[Table 14.5.5.1(a)] <br /> shear strength I on 10.8 k >Vu OK ( D/C=72.84% <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 156.6k II.N`/',I ACI14[Table 14.5.6.1(c)) <br /> bearing strength I 4Bn 101.8 k >Bu OK ( D/C=7.73% <br /> Additional Verification Calc: <br /> max concrete tensile strength f, 375 psi f.=7.5A,177; ACI 14[Eq.19.2.3.1] <br /> max beam tensile stress FL 267 psi Ft=(M*c) <br /> l)xx <br /> If, >Ft OK <br />