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® Page 19 September 18,2012 <br /> SMS= <br /> SD,=2/3 <br /> 11.4.4 SM,= 2/3 X 0.54 = <br /> 11.5 Importance Factor and Occupancy Category <br /> Occupancy Factor Table 1-1 Low Risk <br /> 11.5.1 tahlp ra I Importance Factor Ip = 1.5 reference 13.1.3 Component 1 <br /> 11.6 Seismic Design Category SDt= 0.36 is greater than 0.33 and Occupancy Category is not IV, .All other structures shall be< <br /> table 11.6-1 Short Period Response Acceleration Parameter <br /> table 11.6-2 1 Sec Period Response Acceleration Parameter <br /> 15.4 Strucural Design Requirements <br /> Seismic Coefficients for nonbuilding structures not similar to buildings <br /> table 15.4-2 select mechanically anchored flat bottom <br /> 12.7.2 Effective Seismic Weight W,=Total DL+Total LL(operating weight,assume tank's contents at 9 <br /> Wf= 1,363 + <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 <br /> Total V=0.30 SDSW/p V=0.30 x 0.64 x 5,146 x 1, <br /> AST Only VAST= V=0.30 x 0.64 x 1,371 x 1. <br /> Contents Only Vcontents= V=0.30 x 0.64 x 3,775 x 1. <br /> 15.4.2 Small tank not anchored, treat as ri i "per Section 15. .2 of this standard <br /> Overturning Moment apply V at AST cg <br /> wh <br /> wherF <br /> height of CG,, <br /> seismic MV D AST =VAsr x 2.63 ft = <br /> seismic MV LL =Vc--t-tX 2.57 ft = <br /> CL of CG,to tipping edge wh e r <br /> resist MR =W,x CG,, = <br /> Sliding without anchorage <br /> Check if Sliding Compare frictional resistance vs.V although _ Ir r movement is blocked <br /> 15.7.6.1.5 V<WE tan 300 V<5,146 x 0.577 V<2,969 <br />