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Gyeongsang National University
Tong Lift 각 변의 길이 3☓2☓1m인 철 블록을 들어 올리는 통리프트(Tong Lift)를 설계하고 각 조인트(Joint)에 걸리는 힘과 블록을 잡는 힘(Grip force)을 계산하라. Su-Jin Kim Gyeongsang National University Fall 2014
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Weight Iron density ρ = 7.8 ton/m3 W = ρ V = 7.8 ton/m3 x 3m x 2m x 1m
= 47 ton = 460 kN 3 1m 2
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Joint Method 460 kN 460 kN 5 F 1 ΣFy = 460 – 0.2F -0.2F = 0
F = 1,150 kN
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Moment Equilibrium of moment : ΣM = Σ rF = 0 800 kN 1,150 kN ΣM = rF
=-1x x800 -0.8x xH = 0 H = 957 kN 230 kN B M 0.2 1 0.8 A 0.6 ΣFx = 800+A+957 = 0 A = kN H 230 kN ΣFy = 230+B-230 = 0 B = 0 kN
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Friction Friction : F = μ N F = 0.2 x 957 = 196 kN < 230 kN
Drop accident (Wrong design) 957 kN 230 kN
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