Civil Engineering Reference
In-Depth Information
Table 1.9
Factors for stranded ropes, EN 12385
Rope
Construction
type
Wire rope with fibre core
Wire rope with steel core
Length
mass
factor
Metallic
cross-
sectional
area factor
Minimum
breaking
force
factor
Length
mass
factor
Metallic
cross-
sectional
area factor
Minimum
breaking
force factor
W
1
C
1
K
1
W
2
C
2
K
2
K
3
Single-
layer
rope
6 9 7
0.345
0.369
0.332
0.384
0.432
0.359
0.388
8 9 7
0.327
0.335
0.291
0.391
0.439
0.359
-
6 9 19
0.359
0.384
0.330
0.400
0.449
0.356
-
8 9 19
0.340
0.349
0.293
0.407
0.457
0.356
-
6 9 36
0.367
0.393
0.330
0.409
0.460
0.356
-
8 9 36
0.348
0.357
0.293
0.417
0.468
0.356
-
6 9 35 M
0.352
0.377
0.317
0.392
0.441
0.345
-
6 9 19 M
0.344
0.357
0.307
0.372
0.418
0.332
0.362
6 9 37 M
0.334
0.357
0.295
0.372
0.418
0.319
0.346
Multi-
strand
rope
18 9 7
0.382
0.408
0.328
0.401
0.433
0.328
-
34 9 7
0.390
0.416
0.318
0.401
0.428
0.318
-
Subscript 1 for fibre core
Subscript 2 for steel rope core
Subscript 3 for steel strand core
Rope class 6 9 19 = 6-strand Seale, Warrington or Filler
Rope class 8 9 19 = 8-strand Seale, Warrington or Filler
Rope class 6 or 8 9 36 = 6 or 8-strand Warrington-Seale
N for compound lay strands
M for cross-lay strands
A is the nominal metallic cross-section area (sum of the wire cross-sections)
A
¼
C
d
2
:
ð
1
:
5
Þ
with nominal metallic cross-sectional area factor C, Table
1.9
C
¼
f
p
4
:
ð
1
:
5a
Þ
The nominal rope length-related mass m in kg/m contains the mass of the
strands, the core and the lubricant. Because M is normally the mass of a single
load, m is used for the rope length mass in this topic in contrast usage norms. The
nominal rope length-related mass m in kg/m will be calculated with the rope mass
factor W listed in Table
1.9
and d in mm
m
¼
W
d
2
100
:
ð
1
:
5b
Þ
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