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n r <br /> 15.4 Strucural Design Requirements DK BARBER RCE 21,110 1/26/2015 <br /> Seismic Coefficients for nonbuilding structures not similar to buildings pg 3 of 4 <br /> table 15.4-2 select mechanically anchored flat bottom R= 1.5 <br /> 12].2 Effective Seismic Weight W,=Total DL+Total LL(operating weight,assume tank's contents at full) <br /> W,= 10,896 LBS <br /> 15.7.6 Ground-Supported Storage Tanks for Liquids _ <br /> 15.7.6.1 Fundamental Period 7 eq.12.8-7 <br /> Total V=0.30 S,,Wlo V=0.30 x 0.61 x 4,424 x 1.5= 2,721.7 T. =C,h% <br /> AST Only Ver=V=0.30 x 0.61 x 1,123 x 1.5= 446.1 from table 12.8-2 All other structural <br /> Contents Only Vm„�,=V=0.30 x 0.61 x 3,301 x 1.5= 2,275.5 C,= 0.02 systems <br /> x= 0.75 <br /> 15.4.2 Small tank not anchored treat as rigid per Section 15.4.2 of this standard h= 3.04 <br /> T, = 0.046 ,as T.is<0.06s <br /> V=0.30 SDSWlp eq.15.4-5 <br /> Overturning Moment apply V at AST cg <br /> where VR�= 446.1 <br /> where V. = 2,275.5 <br /> 2,721.7 =Total seismic base shear <br /> nxercncG CGy <br /> seismic My n asr=V-T x 2.14 ft = 446.1 x 2.14 = 954 <br /> seismic My u=VA,,,x 2.14 ft = 2,275.5 x 2.14 = 4,870 <br /> 2.14 5,824 <br /> aorw.me„m..m where M.I= <br /> resist to overturning Ma=W,x CG, = 10,896 x 2.50 = 27,239 f.s: 26,276/6,068 4.7 overturn <br /> Sliding without anchorage No problem <br /> Check if Sliding Compare frictional resistance vs.V although westward and southward movement is blocked by building <br /> 15.7.6.1.5 V<W.tan 30° V<11310 x 0.577 6287 max seismic base shear shall not exceed <br /> 2,722 vs 6,526 f.s: 6526/2835==slide <br /> thus,not necessary to achor <br /> What happens if horizontal movement during major earthquake? Won't tip over if AST slides eastward, <br /> PCC floor is at same elevation(see photo). Perimeter wall prevents westward travel. <br /> Flotation: Empty Weight= 1,634 lbs Footprint(SF)= 70 Bouyant at 0.37 FT if AST Empty. <br /> Flotation due to flooding is not a concern at this location,pan&tank could float if Water was 0.84 FT deep <br /> and AST empty. Review of FEMA Map do ooding in less than 100 year event. <br /> „aFESslGi<� EGEI NEI D <br /> MAR 13 2015 <br /> c7 � <br /> ENVIRONMENTAL <br /> C+` `� 1���•mra nCD�OTxAC�IT <br /> Jf 11 <br /> Tq\F CAUL <br />