LIFTING LUG ANALYSIS FOR HORIZONTAL EQUIPMENT f bĮRECTION WEIGHT, P SHOCK FACTOR, F NUMBER OF LUGS LIFTING LUG DIMENSIONS:įORCES : VERTICAL LIFTING FORCE, PV = P/4*F =, Pc = PV*COS(PHI)+5%PV=, Pr = PV*COS(90-PHI) = MATERIAL : OF DOUBLER PAD YIELD STRESS, Ys= : MATERIAL : OF PIN YIELD STRESS, Ys= ALLOWABLE STRESSES : TENSILE STRESS,Sa=0.6*Ys : SHEAR STRESS, Ss=0.4*Ys : BEARING STRESS, Se=0.8*Ys : BENDING STRESS, Sb=0.66*Ys : ALLOWABLE SHEAR STRESS FOR PIN Ss=0.4*Ys : INDUCED STRESSES : TENSILE STRESS SHEAR STRESS BEARING STRESS BENDING STRESS SHEAR STRESS ON PIN
The multiplier factor can be calculated as follow : The inclination of the slings will cause a horizontal reaction that will amplify the force. The force in one lifting point does not necessarily correspond to the mass to be lifted divided by the number of effective lifting points.It is recommended not to exceed 2 effective lifting points in the calculations if no specific balancing system is used. The quantity of effective lifting points may be less than the quantity of real lifting points if the system is not balanced. Number of lugs Force acting on the lug w j / n n F 2 43281.72 Double shear C/S area at sec a-a (R - d/2) t C/S area at sec b-b (b-d) t Shear stress at area a-a F / Aa (double shear) Permissible shear stress 0.4 Sy RESULT b bp L t Aa Ab 720 1680 Rn w R+s s bp R L 40 10 200 110 300 90 230 Lw Lwp 722.* dynamic factor = with ξ = 0.3 for fixed crane or on rails and ξ = 0.6 for crane bridge. Example with French rules : lifting and handling equipment.
For France, the usage factor can be found on LEGIFRANCE. P90 looks to be a great workout, and looking at these P90 worksheets, there is a fair amount of weight lifting.
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