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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