Laserfiche WebLink
Seismic Calculations-Waste Oil Tank <br /> Latitude Longitude <br /> 38.1156720 -121.2610220 <br /> SMS <br /> 0.896 9 Value checked 9/6/17 <br /> Checking to see if tank is adequately secured for motion laterally <br /> Shear(earthquake lateral force) <br /> For directions right left and down in schematic drawing: <br /> Tank height(w/o supports) 64 in <br /> Tank width 44 in <br /> Tank length 44 in <br /> Tank capacity 200 gal <br /> Weight tank contents full 1501 lbs sp gr motor oil=0.9 <br /> Weight tank empty 1500 lbs from manufacturer's drawing <br /> Weight Waste Oil Tank and contents 3001 lbs <br /> Size of bolts anchoring tank 3/4" <br /> Bolt strength per bolt shear,3/4"bolt 12890 lbs See note below for bolt strength reference <br /> Number of bolts 4 <br /> Bolt strength,four bolts 51560 lbs <br /> Max V(earthquake force) 0.179 W <br /> Max V(earthquake force) 538 lbs <br /> Factor of safety 96 ok <br /> Overturning-directions right and left in schematic drawing: <br /> Moment arm,earthquake 36 in tank supports ore 4"high-see manufacturer's drawing <br /> Overturning moment at Max V* 1613 Ib ft overturning moment caused by earthquake <br /> Seismic Calculations-Waste Oil Tank,continued <br /> Resisting moment of tank** 3083 Ib ft due to weight of tank and contents,supports are 8"from sides <br /> Pullout strength,3/4"bolt 8110 lbs See note below for bolt strength reference <br /> Combined strength,two 3/4"bolts 16220 lbs <br /> Moment arm,bolts 28 in bolts are 28"apart <br /> Resisting moment of bolts 37847 Ib ft <br /> Combined resisting moments 40930 Ib ft of tank and bolts <br /> Factor of safety 25 ok <br /> In directions up and down in schematic drawing,moment arm of bolts is longer,and resisting moment of tank is greater. Therefore factor of safety <br /> is higher.In direction up in schematic drawing,tank is also against a wall. <br /> Bolt strengths from Hilti 2014 American Product Tech Guide-Kwik Bolt TZ Stainless Steel for 2500 psi cracked concrete. <br /> Bolts into concrete have also been sealed with chemical adhesive. <br /> *this calculation overstates the overturning moment because the liquid containing compartment of this tank is only in lower portion. <br /> manufacturer's drawing. Therefore,it is conservative. <br /> "for this calculation assume that vertical component of earthquake=2/3 Max V. <br />