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Date: 19-Nov-19 <br /> STARK Foundation Underpinning Designed by: PMR <br /> FOUNDATIONS "I 11880th Street SW <br /> 0 Everett,WA <br /> Project No.: 19/.151.RFS <br /> Lateral Design:Worst Case <br /> Design Wind Force:(wind governs by inspection) <br /> Note:It is assumed that the roof diaphragm of the addition is supported by the existing structure for lateral loads in the N-S direction since the aspect ratio <br /> exceeds what is permitted by code(77/13=5.92). While the same is assumed to be true for the diaphragm on the east side,the total width of 36' is used <br /> (conservative). <br /> No.Piers: 7 <br /> p'w= 15.8 psf Trib Width,w= 18 ft FROOF=p'w(hw+hr)w <br /> Wall Trib Height,hw= 4.5 ft 1854 lbs <br /> Roof Trib Height,hr= 2 ft <br /> FTOTAL= 1854 lbs <br /> Passive Resistance of Perpendicular Footings(48"x 2 Perpendicular Reinforced Wall Footings) <br /> Width,w= 156 in di= 0 ft <br /> Height= 24 in d2= 2 ft <br /> paiiow= 100 psf/ft pi= 0 psf(passive pressure at top of conc pier) <br /> p2= 200 psf(passive pressure at bottom of conc pier) <br /> Fpassive_ng=2(0.5(p2-pi))(d2-di)w <br /> 5200 lbs <br /> Passive Resistance of Encased Piles <br /> Width,w= 0 in di= 0 ft <br /> Height= 0 in d2= 0 ft <br /> paiiow= 100 psf/ft pi= 0 psf(passive pressure at top of conc pier) <br /> p2= 0 psf(passive pressure at bottom of conc pier) <br /> Fpassive.pier=n 2(0.5(p2-pi))(d2-dt)w <br /> 0 lbs <br /> Fpassive=Fpassive_ttg+Fpassive.pier <br /> 5200 <br /> FS=Fpassive/FTOTAL <br /> = 2.80 Therefore ok <br />