Civil Engineering Reference
In-Depth Information
120
r
d
= 0.54
r
d
90
= 0.64
60
r
d
= 1.6
60
30
d
rope 8x19 FC
rope 8x19-IWRC
ʳ k
0
0
N/mm 2
5
10
15
global rope pressure p 0 = 2S
d.D
Fig. 3.24
Lateral contact angle c k for eight strand ropes in round grooves
4
3
2
1
90
60
120 10 0
30
0
140
30
160
200 180
Grad
220
Grad
90 260
Fig. 3.25
Relative pressure k/p 0 between wire rope and sheave, Häberle ( 1995 )
The pressure on the bottom of the groove k and k max increases and the lateral
contact angle c k = c 1 + c 2 decreases—see Häberle ( 1995 )—with the ratio of the
groove radius and the measured rope diameter r/d m .
The contact anglec k can be evaluated approximately by placing a thin paper
under the rope while it is running over the sheave. Figure 3.24 shows the result of
such an evaluation with two wire ropes and different ratio of groove radius and
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