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16 of 22 <br /> Project Number: Plan Name: Sheet Number: <br /> 5231120-2XR 1711 England Ave Everett <br /> Engineer: Subjrct: Ate: <br /> IT 26"Unreinforced Conc Beam 12/19/23 <br /> DEMAND CALCULATION <br /> number of stories K 1 storks <br /> $Pon L 6.0 ft [max on-center pile spacing] <br /> concrete area A 216 in2 'see attached <br /> concrere self weight SW 225 plf [Includes total height w/o AC114§14.5.1.7 redux] <br /> w DL DL 495 Of [1-story loading] <br /> w LL LL 400 plf [3-story loading] <br /> w r LLr 375 pH [1-story loading) <br /> LL <br /> "Assuming a single span between 2 piles-in reality continuous spans between piles will have reduced moments" <br /> momentfrom OL Ma 3,240 lb-ft 38.9 k-in <br /> moment from LL M, 1,800 lb-ft 21.6 k-in <br /> moment from SL Mu, 1,688 lb-ft 20.3 k-in <br /> shear from DL Va, 2,160lb 2.16 k <br /> shear from LL Vu. 1,200lb 1.20 k V,,,�_?wL <br /> shearfrom 51. V„ 1,125 lb 1.13k <br /> factored moment Muaa 54.4 k-in -1.40L <br /> M_o 91.3 k-in 1.2DL+1.6LL+O.SSL <br /> Mur0 100.7 k-in 1.2DL+1.65L+ILL <br /> controlling factored moment M. 100.7 k-In <br /> factored shear V.. 3.0k 1.4DL <br /> Vu 5.1k 1.2DL+1.61.1.+0.55L <br /> VWa 5.6 it 1.2DL+1.6SL+LL <br /> controlling factored shear V„ 5.6 It <br /> controlling foctomd bearing B. 5.6 It Rmax=Vmaz <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 1tint, 0.6 ACI 318-14[Table 21.2.1] <br /> shear strength red.factor (0mo 0.6 ACI 318-14[Table 21.2.11 <br /> bearing strength red.factor (0— ACI 318-14[Table 21.2.11 <br /> -Note thotper ACI 318-14 Ch.27.3.2 a phi factor of D8 can be used if dimensions and material properties arc confirmed. <br /> moment of ineritio 10 11,016 wA 'see attached <br /> elastic section modulus Sm 1 1,001 in3 'see attached <br /> tens fiber to NA c 13.0 in 'see attached <br /> nom flexure strength(T controls) M„ 250.3 k-in Mn=SAcSm CONTROLS ACI 318-14(Eq.14.5.2.1a] <br /> nomflexurestrength(Ccontrols) M„ 2,127.1 k-in 11 -nx>/':, ACI 318-14[Eq.14.5.2.1b] <br /> RESIDENTIAL CONCRETE M„ 375.4 k-in Mn=7.SSAFf7,Sra X ACI 332-14[Eq.8.2.1.1] -not utilized <br /> flexure strength *M„ 150.2 k-in >Mu OK D/C=67.04% <br /> nom shearstrength V� 14.4 k n=3 AV—r,-A ACI14[Table 14.5.5.1(a)] <br /> shearstrength OV„ 8.6 k >Vu OK D/C=64.72% <br /> loaded bearing area As 74 in2 [IDEAL 2-7/8"Tru-Force Underpinning Bracket] <br /> supporting surface bearing area Az 74 in2 [If the supporting surface is>than loaded area] <br /> nom bearing strength B„ 156.6 it ACI14[Table 14.5.6.1(c)] <br /> bearing strength 94.0 It >Bu OK D/C=595% <br /> Additional Verificatkm Cak: <br /> max concrete tensile strength fr 375 psi f=7.SAff;, ACI 318-14[Eq.19.2.3.11 <br /> max beam tensile stress F, 119 psi F•r_(M•c) <br /> �Lzz <br /> f, >Ft OK <br />