DS 2-8 Earthquake Protection for Water-Based Fire ... - FM Global

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2-8 Earthquake Protection Page 58 FM Global Property Loss Prevention Data Sheets Step 2. Calculate design loads. For the purpose of this example, assume a horizontal acceleration of 0.5 G to be applied to the weight of pipe within the zone of influence for each brace. Assume that sprinkler piping is Schedule 40. Using weights of water-filled pipe from Table 1, horizontal seismic design loads for each sway bracing location can be determined as shown in Table 18. Step 3. Select the proper brace type, size, and maximum length. Based on the configuration of the brace connection to the structure, the angle of the brace from the vertical, and the calculated horizontal design load, the brace type, size, and maximum length can be selected from Tables 2 to 7. Step 4. Using the Step 2 design loads, and the brace angle from the vertical, select the appropriate type and size of fastener for attachment to the building structure. Table 18. Horizontal Seismic Design Load Calculations for System No. 2. Brace Location Nominal Diameter, in. (mm) 1. Riser Bracing (RB) Lateral Longitudinal 6 (150) 6 (150) 6 (150) 6 (150) Number x Length, ft (m) x Weight/Length, lb/ft (N/m) x G= 1x15x31.7x0.5 = (1 x 4.6 x 465 x 0.5) = 1x20x31.7x0.5 = (1 x 6.1 x 465 x 0.5) = = = 1x15x31.7x0.5 = (1 x 4.6 x 465 x 0.5) = 1x31x31.7x0.5 = (1 x 9.5 x 465 x 0.5) = = = Force, lb (N) 238 lb (1070 N) 317 (1418) 555 lb (2488 N) 238 lb (1070 N) 491 (2209) 729 lb (3279 N) (The riser bracing will need to be designed to withstand simultaneously a 555 lb [2488 N] lateral and 729 lb [3279 N] longitudinal horizontal seismic design load.) 2. Feedmain Bracing A,B,C,D- lateral 6 (150) E-lateral 6 (150) F-lateral 6 (150) G-lateral (on feedmain) -longitudinal (on crossmain) 6 (150) 4 (100) 1x40x31.7x0.5 = (1 x 12.2 x 465 x 0.5) = 1 x 32.5 x 31.7 x 0.5 = (1 x 9.9 x 465 x 0.5) = 1x25x31.7x0.5 = (1 x 7.6 x 465 x 0.5) = 1 x 12.5 x 31.7 x 0.5 = (1 x 3.8 x 465 x 0.5) = 1x60x16.4x0.5 = (1 x 18.3 x 241 x 0.5) = = = 634 lb (2837 N) 515 lb (2302 N) 396 lb (1767 N) 198 lb (884 N) 492 (2205) 690 lb (3089 N) (Brace G is a lateral brace for 12.5 ft [3.8 m] of feedmain, and [assuming it is located within 24 in. [0.6 m] of feedmain connection to looped crossmain], also a longitudinal brace for 60 ft [18.3 m] of crossmain. Thus, design should be as a lateral brace for a total load of 690 lb [3089 N].) DD,EE,FF - longitudinal 6 (150) 1x62x31.7x0.5 = (1 x 18.9 x 465 x 0.5) = ©2010 Factory Mutual Insurance Company. All rights reserved. 983 lb (4394 N)
Earthquake Protection 2-8 FM Global Property Loss Prevention Data Sheets Page 59 3. Crossmain Bracing H,N,O,U -lateral -longitudinal 4 (100) 1 1 ⁄ 2 (40) 2 (50) 4 (100) 1x20x16.4x0.5 = (1 x 6.1 x 241 x 0.5) = 8x10x3.6x0.5 = (8 x 3.1 x 53 x 0.5) = 10x10x5.1x0.5 = (10 x 3.1 x 75 x 0.5) = = = 1x25x16.4x0.5 = (1 x 7.6 x 241 x 0.5) = Total = = 164 lb (735 N) 144 (657) 255 (1163) 563 lb (2555 N) 205 lb (916 N) 768 lb (3471 N) (Braces H, N, O, and U are end-of-crossmain lateral braces, located within 24 in. [0.6 m] of end of crossmain, and also act as longitudinal braces for 25 ft [7.6 m] of the crossmain loop piping. Design should be as lateral braces with total crossmain and branchline load of 768 lb [3471 N].) I,J,L,M, P,Q,R,S,T -lateral 4 (100) 1 1 ⁄ 2 (40) 2 (50) 4x10x16.4x0.5 = (4 x 3.1 x 241 x 0.5) = 16x10x3.6x0.5 = (16 x 3.1 x 53 x 0.5) = 20x10x5.1x0.5 = (20 x 3.1 x 75 x 0.5) = = = 328 lb (1494 N) 288 (1314) 510 (2325) 1126 lb (5133 N) (These are all lateral braces with crossmain/branchline portions for total design load of 1126 lb [5133 N].) K -lateral -longitudinal 4 (100) 1 1 ⁄ 2 (40) 2 (50) 6 (150) 4x10x16.4x0.5 = (4 x 3.1 x 241 x 0.5) = 16x10x3.6x0.5 = (16 x 3.1 x 53 x 0.5) = 20x10x5.1x0.5 = (20 x 3.1 x 75 x 0.5) = = = 1x31x31.7x.5 = (1 x 9.5 x 465 x 0.5) = Total = = 328 lb (1494 N) 288 (1314) 510 (2325) 1126 lb (5133 N) 491 lb (2209 N) 1617 lb (7342 N) (Brace K is a lateral brace for the crossmain as well as a longitudinal brace for 31 ft [9.5 m] of the feedmain, and should be designed as a lateral brace with a total load of 1617 lb [7842 N].) V,Y,Z,CC -lateral -longitudinal 4 (100) 4 (100) 1 x 16.5 x 16.4 x 0.5 = (1 x 5.0 x 241 x 0.5) = 1x40x16.4x0.5 = (1 x 12.2 x 241 x 0.5 = Total = = ©2010 Factory Mutual Insurance Company. All rights reserved. 135 lb (603 N) 328 lb (1740 N) 463 lb (2073 N)
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DS 2-8 Earthquake Protection for Water-Based Fire ... - FM Global

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