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COVEY AUTO EXPRESS,INC. Stockton,CA DK BARBER RCE 21,110 1/23/2014 15.4 Strucural Design Requirements Seismic Coefficients for nonbuilding structures not similar to buildings pg 2 of 3 table 15.4-2 select Non-anchored"All-other" R=1.5 1272 Effective Sei kWdghr W,=Total DL+Total LL(operating weight,assume tank's contents at 100%full) DL= 409 LL= 3,800 W,= 4,209 LBS 15.7.6 Ground-Supported Storage Tanks for Liquids 15.7.6.1 IF Small tank anchored treatasrigid per Section 15.42 of this standard Fundamental Period? eq.12.8-7 Total V=0.305gWfe V=0.30z0.61x 4,215x 1.5= 1,149 T, = AST OnlyCih°n per 15.4.4 Wits only Vye V=0.30 x 0.61 z 415 x 1.5= 112 from table 12.8-2 All other structural Contents Only Vc„,d V=0.30 x 0.61 x 3,800 x 1.5= 1,037 Cr= 0.02 systems 15.4.2 IF Small tankno[anchored. trea[asri id x= 0.75 8 Per Section 15.4.2 of this standard h= 3.95 where T is less than 0.06 54, T. = 0.056 ,as T.is<0.06s Sm is the design spectral response V=0.30 SgW6 eq.15.4.5 Overturning Moment apply V at AST cg where V,,,r= 112 whereV..= 1,037 1,149 =Total seismic base shear FnP,M6, seismic Mvo asr=V.,. x 2.08 ft = 112 x 2.08 - 232 seismic My u=V,,,,,x 2.08 ft = 1,037 x 2.08 = 2,153 where M.= 2,384 CG,= 2.08 resist Ms=W,x CGa = 4,209 x 1.25 = 5,262 fs. 5262l2384= Sliding without anchorage wood block 221 Check If Sliding Compare frictional resistance vs.V although eastward and soutward movement is blocked No problem 15.7.6.1.5 V<W,tan 30° V<2,257 x 0.577 V<1,302 max seismic base shear shall not exceed 1,149 W 2,429 f.s.=2429/1149= 2.11 No problem Plugs should be steel. Wood Blocking shoud be pelaced with steel saddle,elevate AST at least 4 IN above floor What happens if horizontal movement during major earthquake? Won't tip over if AST slides westward,addsfio ll$may ha another rank floor is at same elevation(see photo). Exterior wall resticts travel. Flotation: Empty Weight= 409 lbs, Area(SF)= 21.8 Bouyant at 0.30 FT of water above tank botton,if AST Empty. Tank in concrete containment basin Flotation due to flooding is not a concern at this location,tank could Float if water was 0.30 FT deep and AST empty. Review of FEMA Map does not suggest flooding In less than 100 year event.