Civil Engineering Reference
In-Depth Information
Fig. 1.38
Cross-section of a
b
Z-wire
M
S
a
B 1
B 2
Fig. 1.39 Wire helix in
ground-plan and elevation
Z
M
X
P
a sin
ʱ
a cos
ʱ
Y
P
b
M
r
X
point M as origin of the coordinates. The coordinates y and b have the same direction
as the radius r between the centre of the strand and the wire turning point M.
Figure 1.38 shows the cross-section of a Z-wire as an example. In the strand
(spiral rope) the point B 2 is lying on the point B 1 of the neighbouring wire. The
turning point M therefore has to lie on the mid-perpendicular between B 1 and B 2 .
The turning point M and the centre of gravity S are not identical in this case.
In Fig. 1.39 , the Z-wire is shown both in its ground-plan and elevation. The
point P is calculated with the ( 1.9 )or( 1.9a ) and ( 1.9b ) in a section perpendicular
to the strand axis. In the same way, the contour of the wire cross-section per-
pendicular to the axis of the strand is found by calculating point-by-point.
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