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Seismic Calculations-Waste Water Tank Shear(earthquake lateral force)For directions right,up and down in schematic drawing: Tank height 46 in not including supports Tank width 46 in Tank length 68 in Tank capacity 480 gal Weight waste Water,full 4003 lbs sp gr Water=1 Weight tank empty 1350 lbs from manufacturer's drawing Weight tank and contents 5353 lbs Size of bolts anchoring tank 3/4" Bolt strength per bolt,shear,3/4"bolt 12890 lbs See note below for bolt strength reference Number of bolts 3 Strength reduction factor for spacing 0.667 multiply bolt strength by this factor Net bolt strength per bolt 8598 lbs Combined strength,bolts(per bracket) 25793 lbs Max V(earthquake force) 0.179 W Max V(earthquake force) 959 lbs Factor of safety 27 ok In direction left in schematic drawing,tank is against a wall. Overturning For directions up and down in schematic drawing Earthquake moment arm 26 in Earthquake overturning moment 2078 Ib ft Moment arm,tank and contents 26 in supports are 8"from tank ends Resisting moment tank and contents 10212 Ib ft Seismic Calculations-Waste Water Tank,continued Pullout strength,1/2"bolt 3180 lbs wall bolts for cable anchor on wall above WC Tank Number of bolts 3 Combined strength,1/2"bolts 9540 lbs bolt strength controls,not cable strength Cable moment arm 26 in Cable resisting moment 20670 Ib ft this is the added resistance to overturning due to the cable Combined resisting moments 30882 Ib ft of tank,contents and cable Factor of safety 15 ok For direction right in schematic drawing Moment arm,earthquake, WW Tank 26 in tank supports are 3"high Earthquake overturning moment, WW Tank 2078 Ib ft Moment arm tank and contents, WW tank 23 in Resisting moment WW tank and contents 9034 Ib ft note tank will not overturn,even without cable Pullout strength,1/2"bolt 3180 lbs wall bolts for cable anchor on wall above WW Tank Number of bolts 3 Combined strength,1/2"bolts 9540 lbs Cable moment arm 49 in Cable resisting moment 38955 Ib ft this is the added resistance to overturning due to the cable Combined resisting moments 47989 Ib ft of tank,contents and cable Factor of safety 23 ok In direction left in schematic drawing,tank is against a wall. Bolt strength from Hilti 2014 American Product Tech Guide-Kwik Bolt TZ Stainless Steel for 2500 psi cracked concrete. Bolts into concrete have also been sealed with chemical adhesive.