Civil Engineering Reference
In-Depth Information
Table 3.14 Constants for calculating the number of bending cycles, Feyrer ( 1985 , 1997 , 2011 )
Breaking number of bending cycles N
Rope class
b 0 for
b 0 for
b 1
b 2
b 3
N 10
N
sZ
zZ
sZ
zZ
cross lay 6x19
FC
-0.809
-
-1.338
-
0.875
6.480
-1.850
-
-0.658
-
-1.132
0.562
6.430
-1.628
Seale 8x19
-1.949
-1.726 -2.279
-2.056
Filler 8x(19+8F)
FC
-1.728
-1.505 -2.058
-1.835
1.280
8.562
-2.625
Warr. 8x19
-1.728
-1.505 -2.058
-1.835
Warr.-Seale 8x36
0.809
0.917
0.479
0.587
0.096
7.078
-1.920
Seale 8x19
-1.772
-1.712 -2.131
-2.071
Filler 8x(19+6F)
IWRC -1.684
-1.624 -2.043
-1.983
1.290
8.149
-2.440
Warr. 8x19
-1.684
-1.624 -2.043
-1.983
Warr.-Seale 8x36
1.278
1.332
0.919
0.973
0.029
6.241
-1.613
Spiral round-
18x7
-2.541
-2.837
1.566
9.084
-2.811
strand rope
34x7
-1.063
-1.574
1.351
7.652
-2.485
Discarding number of bending c y cles N A
Rope class
b 0 for N A10
b 1
b 2
b 3
b 0 for N A
sZ
zZ
sZ
zZ
Seale 8x19
-2.660
-2.437 -3.040
-2.817
Filler 8x(19+6)
FC
-2.525
-2.302 -2.905
-2.682 1.887
8.567
-2.894
Warr. 8x19
-2.525
-2.302 -2.905
-2.682
Warr.-Seale 8x36
-1.351
-1.243 -1.731
-1.623 1.322
8.070
-2.649
Seale 8x19
-2.197
-2.137 -2.647
-2.587
Filler 8x(19+6)
IWRC -2.064
-2.004
-2.514
2.454
1.588
8.056
-2.577
Warr. 8x19 -2.064 -2.004 -2.514 -2.454
Warr.-Seale 8x36 0.584 0.638 0.134 0.188 0.377 6.232 -1.750
Spiral round- 18x7 -2.821 -3.215 1.834 8.991 -2.948
strand rope 34x7 -1.432 -1.792 1.619 7.559 -2.622
The discarding numbers of bending cycles for lang lay ropes and for spiral round
strand ropes are valid
if the ropes will be inspected by magnetic methods
or if the for the considered rope have been established by tests that outside wire
breaks occur indicating the discard.
sZ = ordinary lay, zZ = lang lay, FC = fibre core, IWRC = independent wire rope core
• The wire rope is well-lubricated with viscous oil or Vaseline
• The sheaves have steel grooves, r = 0.53 d
• There is no side deflection
• It is in a dry environment.
The following can be calculated with ( 3.55 ) and using the constants listed in
Tables 3.14 and 3.14a :
 
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