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Lifting Lug Calculation

The document details the calculations for a lifting lug, including material properties, dimensions, and stress analysis. It evaluates shear, tensile, and bending stresses, with results indicating a failure in bending stress but passing in shear and tensile stress. The weld checks also pass, confirming the lug's structural integrity for the specified load.

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Ruben Bartolome Garcia
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92 views3 pages

Lifting Lug Calculation

The document details the calculations for a lifting lug, including material properties, dimensions, and stress analysis. It evaluates shear, tensile, and bending stresses, with results indicating a failure in bending stress but passing in shear and tensile stress. The weld checks also pass, confirming the lug's structural integrity for the specified load.

Uploaded by

Ruben Bartolome Garcia
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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LIFTING LUG CALCULATION :

Max.
Material of lug IS 2062 Gr A erection <=10
Yield Stress Sy 250 N/mm2 weight T
Width of lifting lug b 200 mm t 12
Width of lifting lug pad bp 300 mm b 200
Length of lifting lug pad L 230 mm d 60
Thickness of lifting lug t 12 mm E 130
Distance of hole from the top of the
lifting lug R 90 mm Rn 40
Diameter of hole in the lifting lug d 60 mm w 10
Top of brace from the center of hole s 110 mm R+s 200
Total weld length on lifting lug Lw 722.83185 mm s 110
Total weld length on lifting lug pad Lwp 1060 mm bp 300
Fillet weld size on lifting lug w 10 mm R 90
Fillet weld size on lifting lug pad wp 9 mm L 230
E 130 mm
Rn 40 mm Result of the lifting lug
Lw 722.83
Weight to be lifted W 4412 KG Lwp 1060
Jerk factor j 2 FAIL
Number of lugs n 2
Force acting on the lug = w * j / n F 43281.72 N

Double shear
C/S area at sec a-a = (R - d/2) * t Aa 720 mm2
C/S area at sec b-b = (b-d) * t Ab 1680 mm2
Shear stress at area a-a = F / Aa
(double shear) Ssa 60.11 N/mm2
Permissible shear stress 0.4 * Sy Ss 100 N/mm2
RESULT PASS

Tenisile stress
Tenisile stress at area b-b = F / Ab Stb 25.76 N/mm2
Permissible tenisile stress = 0.66 * Sy Stb 165 N/mm2
RESULT PASS

Bending stress
Horizontal force on lifting lug (assuming
150 sling angle) Fh 11197.978 N
Bending moment at base of Bracing =F*h Mo 1231777.6 N-mm
Section modulus of bracing = b * t2 / 6 z 4800.00 mm3
Bending stress Mo / z Sbw 256.62 N/mm2
Permissible bending stress 0.66 * Sy Sbw 165 N/mm2
RESULT FAIL

Weld check of the lug

Total weld area of fillet of lifting lug


= ( Lw * w ) / 1.414 Aw 5111.97 mm2
Shear stress = F / Aw Ssw 8.47 N/mm2
Total weld area of fillet of lifting lug pad
= ( Lwp * wp ) / 1.414 Awp 6746.82 mm2
Shear stress = F / Awp Sswp 6.42 N/mm2
Permissible shear stress = 0.4 * Sy Ss 100 N/mm2
RESULT PASS
<=25 <=45 <=90 <=140 <=180
T T T T T
28 40 50 70 80
230 300 400 500 610
75 75 100 130 150
130 150 200 250 300

40 50 75 90 100
14 20 30 38 46
230 300 400 500 600
140 185 250 320 370
330 400 500 600 710
90 115 150 180 230
230 250 300 350 400

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