W w2 = W w1 + W L + 2.Hbeam Section Modulus of weld lines, SW = SW= tw.W L2/3 Efficiency of weld, n = Allowable Load on weld Tension Stress at the weld = ST=(F.cos(q).H/SW+ F.sin(q)/ (W w2.tw)) / n Shear Stress at the Weld = ST=( F.cos(q)/ (W w1.tw))/ n Length of weld including welding in web of beam, W Stresses in Weld: The calculation used is conservative as it only includes top fillet welds (actual stresses are lower) Leg size of fillet weld, LW = use 45 degree fillet weld Throat size of fillet feld, tW = Stress at near the hole = SS = F.cos(q) / ((2.R - DH).tL) Shear Stresses in the Lug: Stress at Lug to Beam Joint = SS = F.cos(q) / (tL.W L) Tension Stresses in the Lug: Weight in each Lug, W = Cable Tension at Lug, F = Inertia Moment of Lug, IL = Stress at Lug to Beam Joint = ST = F.cos (q). Lug Dimensions: Height of hole centreline, H = Width of Lug, W L = Radius of Lug, R = Diameter of Hole, DH = Thickness of Lug, tL = Allowable Stresses: Lug Material Allowable Tension Stress, 0.6 x Fy = Allowable Shear Stress, 0.4 x Fy =Ģ0000 kgs = 1 2.0 60 degrees 40,000 kgs =ĭH/2R = 0.20 Stress-Concentration Factor (near hole), K = 2.5 (for flat plate with centrally located circular hole in tension based on DH/2R value) STANDARD LIFTING LUG DESIGN 20 TONS CAPACITY Generals: total weight (Empty Skid + lifted equipment) = number of lifting points = Safety Factor, FS = Min.
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