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UNDERUROUND TANK INSTALLATION Page 4 <br /> Design for Anchorage Against Buoyancy ZWitgrn Guide <br /> STEP 8 -Determine Total Anchorage Load <br /> Determine the Total Anchorage Load by subtracting the Holddown Provided <br /> by Installation from the Design Uplift Force. If the Total Anchorage Load is a <br /> negative number then no anchorage is required for the Installed Condition <br /> and no further analysis is necessary. <br /> If the Total Anchorage Load is a positive number then anchorage is required. <br /> Proceed to Step 9. <br /> i 3 lbs. Design Uplift Force (25) <br /> 52(.7 lbs. Holddown Provided by Installation (38) <br /> ®t lbs. TOTAL ANCHORAGE LOAD <br /> STEP 9-Determine Holddown Available from Anchors <br /> Separately determine the weight of backfill and slab materials for both the <br /> wet and dry conditions for Zones 1, 2&3. This weight will be determined in <br /> terms of unit weight per square foot of plan area. Add all of the individual Dry HT,Zone 1 (13) ft. <br /> weights to determine the Holddown Available from Anchors. Wet HT,Zone 1 (14) 67 fL <br /> Height Unit WT Dry HT, Zone 2 (15) — ft. <br /> of area of Marl Wet HT, Zone 2 (16) ft. <br /> Q Unit weight of Dry Slab O C ft x 150.0 = lbs/sq ft Dry HT, Zone 3 (17) — ft. <br /> Q Unit weight of Wet Slab - (-7 ft x 87.6 = lbs/sq ft Wet HT, Zone 3 (18) o fL <br /> Q Unit weight of Dry Zone 2 ft x 100.0 = lbs/sq ft <br /> Q Unit weight of Wet Zone 2 C "63> ft x 37.6 = —G 1'T "Z lbs/sq ft <br /> © Unit weight of Dry Zone 3 O C:> ft x 100.0 = — lbs/sq ft <br /> © Unit weight of Wet Zone 3 ® �r - ft x 37.6 = z O 3 $ lbs/sq ft <br /> ® HOLDDOWN AVAILABLE FROM ANCHORS = 3 �cl lbs/sq ft <br /> x 2& G`6?S ft,tank length (5) <br /> Qi HOLDDOWN AVAILABLE FROM ONE ANCHOR = _ f `((�D� lbs/ft of width <br /> x 2 anchors per tank <br /> Q TOTAL HOLDDOWN AVAILABLE FROM ANCHORS = 7 Z 7 lbs/ft of width of each anchor <br /> STEP 10 -Determine Required Width of Deadman Anchors <br /> Determine the required width of deadman anchors by dividing the Total Anchorage Load by the Total <br /> Holddown Available from Anchors. This is the width of each deadman which must lie entirely outside the tank <br /> shadow. If the width of the tank shadow plus the width of the two deadman anchors exceeds the width of the <br /> concrete slab at grade then the concrete slab must be widened to at least the combined width of the tank plus <br /> the two deadman anchors. On multiple tank installations, the tank spacing must be at least the width of two <br /> deadman anchors side by side. <br /> lbs. Total Anchorage Load (39) <br /> + � Ibs/ft width Total Holddown Available from Anchors (48) <br /> 9- 1,7 ft. REQUIRED WIDTH OF DEADMAN ANCHORS <br />