Laserfiche WebLink
COVEY AUTO EXPRESS,INC. Stockton,CA <br /> 15.45trucural Design Requirements DK BARBER ACE 21,110 1/23/2014 <br /> Seismic Coefficients for nonbuilding structures not similar to buildings pg 2 of 3 <br /> table 15.4-2 select mechanically anchored flat bottom R=3 <br /> I7.71Eftactiveseirmk Weght Wa=Total DL+Total LL(operating weight,assume tank's contents at 90%full) <br /> 15.7,6 Ground-Supported Storage Tanks for Uquids W,° 4,428 LBS <br /> 15.7.6.1 Small tank anchored treatasrigid per Section 15.4.2 of this standard Fundamental Period? <br /> Total V=0.30 SaW/n V=0.30 x 0.61 x 4,424 x 1.5= eq.12.8-7 <br /> 1,209 Ta =(,ry`a <br /> AST Only V.=V=0.30 x 0.61 x 1,123 x 1.5= 307.6 from table 12.8-2 All other structural <br /> Contents Only V,°,,,_,,,=V=0.30 x 0.61 x 3,301 x 1.5= 901.3 C,= 0.02 <br /> systems <br /> 15.4.2 Small tank not archorec treat as rigid per Section 15.4.2 of this standard x= 0.75 <br /> h= 3.04 <br /> Ta = 0.046 ,as T.is<0.06s <br /> V=0.305DSWIp eq.15.4-5 <br /> Overturning Moment apply Vat AST cg <br /> where V,,= 3075 <br /> where V,°,,,,,m= 901.3 <br /> 1,209 =Total seismic base shear <br /> Ry,d[y <br /> seismic My o AST=Vw x 1.51 ft = 307.6 x 1.51 = 463 <br /> seismic My u=Vm..-.x 1.45 ft - 901.3 x 1.45 = 1,303 <br /> where MS„„= 1,766 CG,=1766/1709 1.46 <br /> resist MR=W,x CG, = 4,428 x 1.54 = 6,819 f.s: 681911766= 3.86 <br /> Sliding without anchorage <br /> Check if Sliding Compare frictional resistance vs.V although eastward and westward movement is blocked No problem <br /> 15.7.6.1.5 V<W,tan 300 V<4,428 x 0.577 V<2,555 max seismic base shear shall not exceed <br /> 1,209 vs 2,555 f.s.-2555/1209= 2.11 <br /> No problem <br /> PVC Plugs should be replaced with steel.Continue to monitor interstitial for leakage. <br /> What happens if horizontal movement during major earthquake? Won't tip over if AST slides westward,addhionaa7.mayhh awthertank <br /> floor is at same elevation(see photo). Exterior wall resticts eastward travel. <br /> Flotation: Empty Weight= 1,127 lbs Foo1print(5F)= 26.95 Bouyant at 0.67 FT of water if AST Empty. <br /> Flotation due to flooding is not a concern at this location,tank could float if water was 0.67 FT deep <br /> and AST empty. Review of FEMA Map does not suggest flooding in less than 100 year event. <br />