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2K Cold Box Mechanical Analysis – Anchoring
Scott Kaminski LCLS-II 2K Cold Box FDR March 28, 2018
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Applicable Codes / Standards / Specifications Vacuum Skid
Outline Applicable Codes / Standards / Specifications Vacuum Skid Electrical Cabinets Cold Box Summary Questions LCLS-II 2KCB FDR, March 28, 2018
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1. Applicable Codes / Standards / Specifications
10 CFR 851 LCLS-II Project BIO Codes and Standards of Record (LCLSII-1.1-TS-0035) Cryogenic Plant Seismic Design Criteria (LCLSII-4.8-EN R2) SLAC ES&H Manual CBC / CMC – 2013 Edition ASCE 7-10 Third Printing AISC 360 – 2010 Edition AWS D1.1 – 2012 Edition ACI 318 – 2011 Edition LCLS-II 2KCB FDR, March 28, 2018
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1. Applicable Codes / Standards / Specifications
KEY SEISMIC DESIGN REQUIREMENTS LCLSII-4.8-EN-0227-R2 Site Design Criteria Reduced Response Modification Factor ASCE Anchor embedment in concrete shall develop the steel strength of the anchor in tension Anchors shall have a minimum gauge length of eight diameters LCLS-II 2KCB FDR, March 28, 2018
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2. Vacuum Skid Operating weight of 1,000 lbs with a center of gravity ~22” above grade and slightly offset LCLS-II 2KCB FDR, March 28, 2018
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2. Vacuum Skid Use most conservative base shear (V = g) and overstrength (Ω0 = 3) ASCE Load Combination 7 ( SDS) D + Ω0QE Design Loads Vertical = -506 lbs Vx = 1,012 lbs Vy = -3,374 lbs Mx = 75,109 in-lbs My = 21,254 in-lbs Mz = 8,519 in-lbs The anchor bolts are suitable if the applied loads do not exceed the reduced steel tensile, bond, concrete breakout, steel shear, pryout and combined strengths. LCLS-II 2KCB FDR, March 28, 2018
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2. Vacuum Skid Six 5/8” 316SS Hilti Kwik Bolt TZ with a 4” effective embedment Reduced Steel Strength Reduced Pullout Strength Reduced Strength Concrete Breakout Tension Utilizations 8.9% 33.2% 66.2% Reduced Pryout Strength Shear Utilizations 11.1% 7.6% Combined 52.8% LCLS-II 2KCB FDR, March 28, 2018
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3. Electrical Cabinets Operating weight of ~600 lbs with a center of gravity ~55.5” above grade LCLS-II 2KCB FDR, March 28, 2018
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3. Electrical Cabinets Base shear of V = g and overstrength of Ω0 = 2.5 ASCE Load Combination 7 ( SDS) D + Ω0QE Design Loads Vertical = -300 lbs Vx = 1,000 lbs Vy = -300 lbs Mx = 16,650 in-lbs My = 55,500 in-lbs The anchor bolts are suitable if the applied loads do not exceed the reduced steel tensile, bond, concrete breakout, steel shear, pryout and combined strengths. Account for Concrete Breakout Area Overlap LCLS-II 2KCB FDR, March 28, 2018
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3. Electrical Cabinets Four 1/2” CS Hilti Kwik Bolt TZ with a 3.25” effective embedment Reduced Steel Strength Reduced Pullout Strength Reduced Strength Concrete Breakout Tension Utilizations 15.8% 41.8% 52.2% Reduced Pryout Strength Shear Utilizations 7.4% 3.0% Combined 35.2% LCLS-II 2KCB FDR, March 28, 2018
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4. Cold Box Operating weight of ~41,000 lbs with a center of gravity ~6’-8” above grade LCLS-II 2KCB FDR, March 28, 2018
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4. Cold Box Separate Shear and Tension Resistance Mechanisms
LCLS-II 2KCB FDR, March 28, 2018
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4. Cold Box Base Shear of V = 1.968 g and no overstrength for anchors
ASCE Load Combination 7 ( SDS) D + ρQE Account for MTL Nozzle Load Design Loads Vertical = -20,700 lbs ρQE (Mx) = 9,738,300 in-lbs ρQE (My) = 3,350,900 in-lbs The anchor bolts are suitable if the nominal bond and concrete breakout utilizations are less than 120% of the nominal steel utilization (the anchor embedment develops the steel strength of the anchor in tension) and the applied loads do not exceed the reduced steel, bond and concrete breakout strengths. Account for Concrete Breakout Area Overlap (with columns, cabinets, vacuum skid) LCLS-II 2KCB FDR, March 28, 2018
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4. Cold Box Twelve 3/4” F1554 Grade 36 anchors equally spaced on a ” diameter. Hilti HIT-RE 500 V3 adhesive anchoring system with an effective embedment depth of 12.5”. Anchors chairs with a top face 7” above the base ring top face (gauge / stretch length of more than eight diameters). LCLS-II 2KCB FDR, March 28, 2018
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120% Nominal Steel Strength Nominal Concrete Breakout Strength
4. Cold Box 120% Nominal Steel Strength Nominal Bond Strength Nominal Concrete Breakout Strength Tension Utilizations 57.1% 44.0% 38.4% Reduced Strength Steel Reduced Strength Bond Reduced Strength Concrete Breakout 91.6% 90.1% 78.8% LCLS-II 2KCB FDR, March 28, 2018
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4. Cold Box Base Shear of V = g and Ω0 = 2.0 for shear keys ASCE Load Combination 5 ( SDS) D + Ω0 QE + L + 0.2S Account for MTL Nozzle Load Design Loads V = 230,300 lbs Suitable if the bearing strength of the concrete exceeds the applied bearing load, the reaction shear load does not yield the shear key in shear, the resulting moment does not yield the shear key in bending and the attachment weld is sufficient for the shear / moment applied at the shear key-base ring connection. LCLS-II 2KCB FDR, March 28, 2018
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4. Cold Box Twelve 4” XXS A106 Grade B pipes equally spaced on a 150” diameter 7.625” long such that they extend 4” into the concrete slab Two 1.5” diameter holes to facilitate the flow of grout Concrete Bearing Pipe Shear Stress Pipe Bending Stress Attachment Weld Utilizations 66.4% 49.3% 95.4% 96.9% LCLS-II 2KCB FDR, March 28, 2018
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4. Cold Box The anchor chairs are suitable if none of the components yield Apply the strength of the anchor in tension (14,500 lbs) 1” Thick Top Plate and Base Ring ½” Thick Skirt and Stiffeners ¾” Washers Top Plate Stiffeners Washer Skirt Attachment Welds Utilizations 47.6% 2.0% 82.3% 17.2% 18.1% LCLS-II 2KCB FDR, March 28, 2018
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5. Summary The 2K Cold Box Electrical Cabinets, Vacuum Skids and Cold Boxes are adequately anchored for the design conditions. LCLS-II 2KCB FDR, March 28, 2018
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Thank you for your kind attention,
6. Questions Thank you for your kind attention, Questions? LCLS-II 2KCB FDR, March 28, 2018 20
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