lifting lug design_r00a
TRANSCRIPT
-
8/12/2019 Lifting Lug Design_R00A
1/6
-
8/12/2019 Lifting Lug Design_R00A
2/6
1 A. CHECK ON LUG STRENGTH
2 (1) LUG DIMENSIONS
3
4
5
6
7
8
9
10
11 Material :
12 SS400
13 Fy = 235 MPa
14 Fu = 400 MPa
15
16 The geometric properties are as follow :
17 e = 85 mm
18 T1 = t = 20 mm
19 D = w = 180 mm
20 d = 60 mm
21
22 Check dimensional requirements using AISC 360-05 Specification Section D5.2
23
24 1. be = 2t + 16 mm
25= 56 mm < 60 mm Controls
26 2. a > 1.33be
27 60 mm > 74 mm NOT OK (See our recommendation in the last page)
28 3. w > 2be + d
29 180 mm > 172 mm OK
30
4. c
>
a31 60 mm > 60 mm OK
32
33
34 (2) DESIGN LOAD
35 Max. Load W = kg
36 Impact Load Factor f = 2
37 Design Load Wd = kg
38 Number of lug used N = 4
39 Design Load per Lug Fv = kg
40 = 30 deg1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
11000
22000
5500
Page 2 of 6
-
8/12/2019 Lifting Lug Design_R00A
3/6
1 P = Fv/cos = kg
2 Fh = P*sin = kg
3
4 = 5 deg
5H = Fv*tan = 481 kg
6
7Resultan force, R = SQRT (Fv
2+ Fh
2+ H
2)
8 R = kg
9= N
10
11 (3) STRENGTH CHECK
12 a) Tensile Rupture
13 Calculate the available tensile rupture strength on the effective net area
14 Pn = Fu (2tbe) (Spec. Eq. D5-1)
15= N
16 From AISC Specification Section D5.1, the available tensile rupture strength is :
17 Pn , where t= 2.00 for ASD
18 t
19 Pn = N > N --> OK
20
21 b) Shear Rupture
22 Asf = 2t(a + d/2)
23 = mm2
24 Pn = 0.6FuAsf (Spec. Eq. D5-2)
25= N
26 From AISC Specification Section D5.1, the available shear rupture strength is :
27 Pn , where sf= 2.00 for ASD
28 sf
29 Pn = N > N --> OK
30
31 c) Bearing `
32 Apb = td
33 = mm2
34 Rn = 1.8FyApb (Spec. Eq. J7-1)
35 = N
36 From AISC Specification Section J7, the available bearing strength is :
37 Pn , where = 2.00 for ASD
38
39 Pn = N > N --> OK
40
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
62459
1200
507600
25380062459
3175
6369.1
62459
6351
896000
448000 62459
3600
864000
432000
Page 3 of 6
-
8/12/2019 Lifting Lug Design_R00A
4/6
1
2d) Tensile Yielding
3Ag = wt
4 = mm2
5Pn = FyAg (Spec. Eq. D2-1)
6= N
7 From AISC Specification Section D2, the available tensile yielding strength is :
8 Pn , where t= 1.67 for ASD
9 t
10Pn = N > N --> OK
11
12e) Flexural Yielding
13M = Re
14= N.mm
15
16From AISC Manual Table 17-27, the geometric properties are as follow :
17Sx = tw
2
186
19= mm
3
20Zx = tw
2
214
22= mm
3
23
24e-1 Calculate Nominal Flexural Strength, Mn
25Check limit from AISC Specification Section F11.1
26Lbd < 0.08E , where : Lb = 85 mm
27 t2 Fy E = MPa
2838 < 68 ,therefore, the yielding limit state applies
29
30Mn = Mp
(Spec. Eq. F11-1)31
= FyZ < 1.6My
321.6My = 1.6FySx
33= N.mm
34Mp = FyZx
35= N.mm < N.mm --> OK
36So, use Mn = Mp = N.mm
37
38e-2 Lateral-Torsional Buckling (AISC Specification Section F11.2)
39 As per previously calculatedL
bd
< 0.08E , therefore, the lateral torsional buckling limit state does
40 not apply. t2 Fy
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
4E+07
4E+07 4E+07
4E+07
5309024
108000
162000
199948
3600
846000
506587 62459
Page 4 of 6
-
8/12/2019 Lifting Lug Design_R00A
5/6
1
2From AISC Specification Section F1, the available flexural strength is :
3 Mn , where b= 1.67 for ASD
4 b
5Mn = N.mm > N.mm --> OK
6
7Conclusion : The available strength is governed by the bearing strength limit state.
8
9 (4) CHECK ON WELDMENT STRENGTH
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25Pa = N
26a. The maximum fillet weld size that can be used notation per AISC Specification Section J2.2b
27Because the thickness material more than 6 mm, the maximum filled weld size :
28wfmax = t - 2 mm (Spec. J2.2b (b) )
29 = 18 mm
30While, from AISC Specification Table J2.4, the minimum size of fillet weld, based on a material thickness
31 of 20 mm is 8 mm. (Spec. Table J2.4)
32
33 b. Length of Weld Required
34 # The nominal weld strength per mm used = 14 mm weld.
35 Rn = FnwAwe (Spec. Eq. J2-3, J2-4, J2-5)
36 = 0.6FEXXAwe , where FEXX= 483 MPa
37 = N/mm
38
39
40
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
2E+07 5E+06
62459
2866.7
Page 5 of 6
-
8/12/2019 Lifting Lug Design_R00A
6/6
1
2 Pa , where = 2.00 for ASD
3 Rn
4 Min. Length of weld = 44 mm, but the actual length of weld (lw) = 300 mm of weld on each side.
5
6 # From AISC Specification Section J2.2b, for longtudinal filled weld used alone in end connections of flat-bar
7 tension members, the length of each fillet weld shall be not less than the perpendicular distance between them.
8 lw > w
9 300 mm > 180 mm --> OK
10
11Conclusion : Weld size use 14 mm, and length of weld use 300 mm of weld on each side.
12
13
14 B. RECOMMENDATION
15 To avoid not OK in the dimensional requirement (See page 2 row 27 in this report), We recommend to change -
16 the dimensional as the following:
17
18
19
20
21
22
23
24
25
26
27 D = w = 210 mm
28 Check dimensional req. after updated D as per recommendation above:
29
30 1. be = 2t + 16 mm
31= 56 mm < 75 mm Controls
32 2. a > 1.33be
33 75 mm > 74 mm OK
34 3. w > 2be + d
35 210 mm > 172 mm OK
36 4. c > a
37 75 mm > 75 mm OK
38
39
40
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
Page 6 of 6