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COVEY AUTO EXPRESS,INC. Stockton,CA DK BARBER RCE 21,110 1/23/2014 <br /> 15.4 5trucural Design Requirements pg 2 of 5 <br /> Seismic Coefficients for nonbuilding structures not similar to buildings <br /> table 15.4-2 selectmechanically anchored flat bottom R=3 <br /> 12.7.2 Efle seismic wepht W,=Total DL r Total LL(operating weight,assume tank's contents at 100%full) <br /> W,- 2,257 LBS <br /> 15.7.6 Ground-Supported Storage Tanks for Liquids <br /> 15.7.6.1 Small tank anchored treat as rigid per Section 15.4.2 of this standard Fundamental Period 7 eq.12.8-7 <br /> Total V=0.305esWln V=0.30 x 0.61 x 2257x 1.5= 616 T. =C,h`„ <br /> AST Only V,,,=V=0.30 x 0.61 x 169 x 2.5= 46 from table 12.8-2 All other structural <br /> Contents Only Vm,,,,,�=V=0.30 x 0.61 x 3,301 x 1.5= S70 C,= 0.02 systems <br /> x= 0.75 <br /> 15.4.2 Small tank not anchorcd treat as rigid per Section 15.4.2 of this standard h= 3.04 <br /> T, = 0.046 ,as T,is<0.06 s <br /> V=0.30 SDSWlp eq.15.4-5 <br /> Overturning Moment apply Vat AST cg <br /> where V,-r- 46 <br /> whereV_,_= 570 <br /> 616 =Total selsmic ba se shear <br /> ."am <br /> seismic Mvo an=V,,, x 2.17 h - 46.2 x 2.17 = 100 <br /> seismic My u"-x 2.17 ft = 569.9 x 2.17 = 1,234 <br /> owwmsa4.ee. where M,.= 1,334 CG,=1768/7205 2.17 <br /> resist Ms=W,x CG, = 2,257 x 0.92 = 2,076 f.s: 2076/7334= 1.56 <br /> Sliding without anchorage flat plates rather than end of pipe legs No problem <br /> Check if Sliding Compare frictional resistance vs.V although eastward and westward movement is blocked <br /> 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 <br /> 616 vs 1,302 f.s.-1,302/616= 2.11 <br /> No problem <br /> Plugs normal vent should be steel.Popup gauge plastic. <br /> What happens if horizontal movement during major earthquake? Won't tip over if AST slides westward,additionally,may hu another tank <br /> floor is at same elevation(see photo). Exterlor wall resticts westward travel. <br /> Flotation: Empty Weight= 169 lbs, Area(SF)= 11.05 Bouyant at 0.25 FT of water above tank botton,if AST Empty. <br /> Flotation due to flooding is not a concern at this location,tank could float if water was 0.25 FT deep <br /> and AST empty. Review of FEMA Map does not suggest flooding in less than 100 year event. <br />