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IIISFA Design Group, LIE <br /> O. <br /> S IRUCTURAL I GEOTECHNICAL I SPECIAL INSPECTIONS PROJECT 36 SHEET NO. <br /> MFR23-236 <br /> DATE <br /> Bankston Residence Underpinning 3/1/2024 <br /> SUBJECT <br /> BY <br /> Existing Lateral Resistance Along Gridline B CAF <br /> Footing/Foundation Wall Section Properties <br /> .., <br /> Foundation Width,b= 6 in <br /> �'" b <br /> Foundation Depth,d= 24 in r <br /> Int Buried Footing Depth,dt= 6 in <br /> Ext Exposed Footing Depth,dexp= 6 in AS OCCURS(NOT <br /> CONSIDERED FOR } <br /> Cross Sectional Area,A= 144 in2 <br /> Section Modulus,Sx= 144 in MOMENT OR <br /> . ..Gross Moment of Inertia,I,= 6912 in' SHEAR CAPACITY) <br /> Assumed Conc r Ac <br /> = 2000 psi <br /> J <br /> 9 hear Cap acit r_Pe CI318-14 Illy <br /> �4� .a <br /> f <br /> Footin /Foundation Wall MomenConc Modulus of Rupture,fr= 335 psi §19.2.3.1 <br /> Cracking Moment,Mcr=S*fr=4.0 k-ft <br /> Flexure Reduction Factor,tp=0.65 §21.2.2 a <br /> Design Moment,4>Mcr=2.6 k-ft <br /> Shear Strength,Vc= 12880 lbs §22.5.5.1 t <br /> Shear Reduction Factor, =0.75 §21.2.1 <br /> Design Shear,0.54Vc=4830 lbs <br /> Note:Footing and foundation wall capacities are based on a worst case scenario of having no steel reinforcement. <br /> Passive Pressure From Perpendicular Return Walls(Along Gridline B) <br /> Effective Friction Angle=29° <br /> Passive Coefficient,Kp=tanA2*(45+co'/2) <br /> Kp=2.88 ill <br /> Soil Unit Weight,y= 110 pcf STEMWALL <br /> Passive Pressure,Pp=KP*y=317 pcf EXT GRADE <br /> Ext Buried Soil Depth,de=d-12"-dexp=0.5 ft - — — — <br /> `III-1,—III FOOTING INT GRADE <br /> Int Buried Soil Depth,d,=di-12"=0.0 ft 1=1 IE <br /> A=P IA11.. .• <br /> p*(d e)=79 psf -8 11P.. <br /> -a AIM :il•11 LI <br /> B=Pp*(di)=0 psf <br /> RPext eel*w..' • �le�Rp;"a <br /> wext=A*de/2=40 plf . ,, . <br /> gi�llt=. B <br /> wins=B*d/2=0 plf .111..1=111_.M. I1= <br /> (Footing/Foundation Wall Loading <br /> Note: Reference design wext <br /> pads page of calculation ; 1 j 1 ; j 1 ; 1 I Note:Section about is a general representation of a <br /> package for load concrete footing.Refer to plans for specific details <br /> combinations. <br /> " f ' <br /> wint <br /> •J <br /> 1 <br /> Exterior Length Due to Moment,Lext=l(8*4>*fr*I9ext/(yt*wext)/2=5.00 ft <br /> Interior Length Due to Moment,Lint=4(8*4>*fr*I9;nt/(yt*we,n)/2=0.00 ft <br /> Exterior Length Due to Shear,Lee=0.54>V"/we1R=5.00 ft <br /> Interior Length Due to Shear,Lint=0.54>Ve/wins=0.00 ft <br /> Rpext=wext*Lext= 198 lbs <br /> Rpint=wint*Lint= 0 lbs <br /> Lateral Capacity,Rp=Rpext+Rpint= 198 lbs <br /> Slab on Grade Frictional Resistance <br /> Slab Along This Line= No ° <br /> Soil Friction VRESIST=0 lbs <br /> Footing Frictional Resistance Along Gridline B <br /> Unpiered Portion of Gridline B= No <br /> Soil Friction VRESIST=0 lbs <br /> Helical Tieback Resistance Along Gridline <br /> Number o <br /> of Tiebacks Along Gridline=0 -° <br /> Total Tieback Capacity VPIERS=0 lbs <br /> Total available resistance along Gridline B=1981bs+01bs+01bs+01bs+01bs=1981bs <br />