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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