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Unformatted text preview: you came up with the correct reactions … R 1 + R 2 = P1 + P2 Reactions = 5,666.67 LB + 6,333.33 LB = 12,000 LB Loads = 1,000 LB + 11,000 LB = 12,000 LB 12,000 LB = 12,000 LB therefore OK ARC322 Homework #1 Page 3 W = wL = 180 LB/ft x 20 ft = 3,600 LB R 2 – 30 ft = (1175 LB x 10 ft) + (3600 LB x 20 ft) R 2 = 83,750 ftlb/30 ft R 2 = 2,791.67 LB R 1 – 30 ft = (1175 lb x 20 ft) + (3600 LB x 10 ft) R 1 = 59,500 LB/30 ft R 1 = 1,983.33 LB Summing the Vertical Forces: R 1 + R 2 = P + W Reactions = 1,983.33 LB + 2,791.67 LB = 4,775 LB Loads = 1,175 LB + 3,600 LB = 4,775 LB 4,775 LB = 4,775 LB therefore OK Note: When your Engineers do the check, they will sum the forces as those pushing UP = positive and those pushing DOWN = negative … this then gives a sum of the vertical forces as 0 (ZERO). You are welcome to do it this way also....
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 Winter '08
 McGavin

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