Lifting lug calculation.xls

LIFTING LUG CALCULATION : Material of lug Yield Stress Width of lifting lug Width of lifting lug pad Length of lifting lug pad Thickness of lifting lug Distance of hole from the top of the lifting lug Diameter of hole in the lifting lug Top of brace from the center of hole Total weld length on lifting lug Total weld length on lifting lug pad Fillet weld size on lifting lug Fillet weld size on lifting lug pad

IS 2062 Gr A Sy

2 250 N/mm

200 300 230 12

mm mm mm mm

R d s Lw Lwp w wp E

90 60 110 722.83185 1060 10 9 130

mm mm mm mm mm mm mm mm

Rn

40

mm

Weight to be lifted Jerk factor

W j

4412 2

KG

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

722.8 1060

Result of the lifting lug

FAIL N

mm2 mm2 2

Ssa Ss

60.11 N/mm 2 100 N/mm PASS

Stb Stb

2 25.76 N/mm 2 165 N/mm PASS

Bending stress Horizontal force on lifting lug (assuming 150 sling angle) Bending moment at base of Bracing =F*h Section modulus of bracing = b * t2 / 6

Fh Mo z

11197.978 N 1231777.6 N-mm 3 4800.00 mm

Bending stress Mo / z

Sbw

2 256.62 N/mm

Permissible bending stress 0.66 * Sy RESULT

Sbw

2 165 N/mm FAIL

Total weld area of fillet of lifting lug = ( Lw * w ) / 1.414 Shear stress = F / Aw

Aw Ssw

2 5111.97 mm 2 8.47 N/mm

Total weld area of fillet of lifting lug pad = ( Lwp * wp ) / 1.414 Shear stress = F / Awp Permissible shear stress = 0.4 * Sy

Awp Sswp Ss

2 6746.82 mm 2 6.42 N/mm 2 100 N/mm

Tenisile stress Tenisile stress at area b-b = F / Ab Permissible tenisile stress = 0.66 * Sy RESULT

Max. erection <=10 T weight t 12 b 200 d 60 E 130

Weld check of the lug

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 14 230 140 330 90 230

50 20 300 185 400 115 250

75 30 400 250 500 150 300

90 38 500 320 600 180 350

100 46 600 370 710 230 400