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3. Engineering Review of Tanks & Equipment Covered by CalARP Program <br />C:\TRICH\Jobs\4515582 Leprino Tracy\Report\Leprino Tracy CalARP 040221.docx 3-13 <br />ap = component amplification factor <br /> = 1.0 (wet-side HVAC, pressure vessel without skirt/legs) <br /> = 2.5 (pressure vessel with skirt/legs, cooling tower) <br />Ip = component importance factor = 1.0 <br /> Rp = component response modification factor <br /> = 2.5 (wet side HVAC, pressure vessel) <br /> = 3.0 (cooling tower) <br /> Wp = component weight <br /> z = height in structure of point of attachment <br /> h = roof height of structure <br /> <br />3.3.3 Acceptance Criteria <br />The evaluation of the tank anchorage was accomplished by the following procedure: <br />a. Perform elastic modal analysis or equivalent static analysis. <br />Acceptance is presumed if the following equation is satisfied: <br />D + L ± Ehoriz/Q + Evert ≤ Rn (3-1) <br />D ± Ehoriz/Q - Evert ≤ Rn (3-2) <br /> <br />where, <br /> D = Dead load including operating load <br /> L = Live load <br /> Ehoriz = Earthquake horizontal load calculated using elastic <br />response spectra at 5% damping <br /> Q = Ductility based reduction factor <br /> Evert = Earthquake vertical load based on vertical <br />accelerations of 0.2SDS <br />  = Capacity reduction factor or resistance factor <br /> Rn = Nominal capacity per ACI or AISC