Laserfiche WebLink
COVEY AUTO EXPRESS,INC Stockton,CA DK BARBER RCE 21,110 1/23/2014 <br /> 15.4 Strucural Design Requirements pg 2 of 5 <br /> Seismic Coefficients for nonbuilding structures not similar to buildings <br /> table 15.4-2 select mechanically anchored flat bottom R=3 <br /> 12.72Effet0Veseamic Nrlpht W,=Total DL♦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 I - Fundamental Period? eq.12.8-7 <br /> Total V=0.30 S05WIa V=0.30 x 0.61 x 2257x 1.5= 616 Ta =Wn <br /> AST Only V,ss,=V=0.30 x 0.61 x 169 x 1.S= 46 from table 12.8-2 All other structural <br /> Contents Only Voan n V=0.30 x 0.61 x 3,301 x 1.5= 570 C,= 0.02 systems <br /> x= 0.75 <br /> 15.4.2 Small tank not anchored treat az rigid per Section 15.4.2 of this standard It= 3.04 <br /> Ta = 0.046 ,as Tais<0.06s <br /> V=0.30 SDSWIp eq.15.4-5 <br /> Overturning Moment apply Vat AST cg <br /> where V,,,rm 46 <br /> whereV,p„,„== 570 <br /> 616 =Total seismic base shear <br /> .un+w <br /> seismic MVD AST'Vav x 2.17 ft = 46.2 x 2.17 = 100 <br /> seismic My u-V-x 2.17 ft = 569.9 x 2.17 = 1,234 <br /> n.rw.aq.y..p where M,nw= 1,334 CG,=ITM1206 2.17 <br /> resist Ma=W,x CG, = 2,257 x 0.92 - 2,076 f.s.= 2076/1374= 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 30n 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 /> AA Na 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 nn another tank <br /> floor is at same elevation(see photo). Exterior wall resticts westward travel. <br /> Flotation: Empty Weight= 169 lbs, Area(SF)= 11.05 Bouyantat 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 />