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Seismic Calculations - Waste Oil Tank <br />Latitude Longitude <br />38.000012 -121.290497 <br />Seismic acceleration <br />SMS <br />0.995 <br />Checking to see if tank is adequately secured for motion laterally <br />Shear (earthquake lateral force) <br />For all directions in schematic drawing: <br />Tank height (w/o supports) <br />60 <br />in <br />Tank width <br />44 <br />in <br />Tank length <br />44 <br />in <br />Tank capacity <br />200 <br />gal <br />Weight tank contents full <br />1501 <br />lbs <br />Weight tank empty <br />1500 <br />lbs <br />Weight Waste Oil Tank and contents <br />3001 <br />lbs <br />Size of bolts anchoring tank <br />3/4" <br />Bolt strength per bolt shear, 3/4" bolt <br />12890 <br />lbs <br />Number of bolts <br />4 <br />Bolt strength, four bolts <br />51560 <br />lbs <br />Max V (earthquake force) <br />0.199 <br />W <br />Max V (earthquake force) <br />597 <br />lbs <br />Factor of safety <br />86 <br />Overturning - directions right and left in schematic drawing: <br />Moment arm, earthquake 34 in <br />Overturning moment at Max V* 1692 Ib ft <br />Seismic Calculations - Waste Oil Tank, continued <br />Value checked 9/14/17 <br />sp gr motor oil = 0.9 <br />from schematic drawing <br />This is W <br />See note below for bolt strength reference <br />ok <br />tank supports are 4" high - see manufacturer's drawing <br />overturning moment caused by earthquake <br />Resisting moment of tank** 3037 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 40883 Ib ft of tank and bolts <br />Factor of safety 24 ok <br />In directions up and down in schematic drawing, moment arm of bolts is longer. Therefore factor of safety is higher. <br />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 />