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Shear&Bending Calculations G-4400 <br /> Koltonowski Residence Page 4 of 4 <br /> 2514-51st St SW, Everett June 2017 <br /> PIER CAPACITY(3" Diameter Push Piers) <br /> An allowable load capacity of 13,500 lbs(13.5 Kips)per pier is recommended for this project,except for the <br /> 2 piers located at the northeast corner and the 3 piers between the door and window on the north wall. These <br /> 5 piers have an allowable capacity of 16,500 lbs. <br /> Calculated Max. Pier Spacing for SW common foundation wall <br /> Calculated Max.Pier Spacing = Allowable Pier Capacity/Calculated Foundation Load(Dead+Live Load) <br /> Max.Allowable Calculated Foundation Calculated Max <br /> Pier Capacity(lbs) Load(Ibsllf) Pier Spacing(ft) <br /> East wall 13,500 2,432 5.6 <br /> North wall 13,500 3,052 4.4 <br /> Check Bendin• and Shear of Concrete Basement Wall orst Case <br /> North Basement Wall <br /> Calculated Wall Load,dead&live(w): 3,052 lbs/If <br /> Max.Unsupported Foundation(I): 5.4 feet <br /> Max Bending(M): 0.1071 (w)(I^2) = 0.1071 x 3052 x 29.2 = 9532 lb/ft <br /> where: w=calculated wall load <br /> I=max.pier spacing <br /> Max.Shear: 0.607(w)(I) = 0.607 x 3052 x 5.4 = 10004 lbs <br /> Check Bending (Accounts for horizontal crack in stem wall) <br /> Concrete: 2,500 psi <br /> Assume 10%tension capacity= 250 psi <br /> Footing+Stem wall height: 54 inches <br /> Stem wall thickness: 7 inches <br /> Gamma Max. = M/S x C t I = 9532 / 144 x 27 / 8752 = 0.20 psi <br /> where: M=Max. Bending; S= 144 sq in/ft; C=Wall height/2 <br /> I=.667 x(Wall HeightA3)/12 <br /> OK: Gamma Max.of 0.20 psi < Tension capacity of 250 psi <br /> Check Shear <br /> Vc= 0.53 x 2,500 ^1/2 = 27 psi <br /> Concrete Section: 54 inches x 7 inches = 378 inches <br /> Shear Capacity= 27 psi x 378 inches = 10017 lbs <br /> OK: Max.Shear of 10004 lbs < Shear capacity of 10017 lbs <br /> Summary: <br /> Foundation load calculations are based on the calculated dead and live loads of the structure, including roof snow <br /> loads of 25 psf. Lifting of the foundation is planned. Shear and bending were checked for the worst case <br /> condition (north basement wall)and shear and bending is OK for up to a 5.4 foot unsupported foundation section. <br /> 'Ay <br /> \\'''\ C/y-q <br /> Reviewed By: � pF WAsy�y c, <br /> .. f I# -13 <br /> g <br /> isf <br /> OT 9, 20114 44,4`G(STcati� ��� <br /> PnW!Incipalliam Chang,P.E. Ss"�/vAL � <br /> GTO Group Northwest,Inc. <br />