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Section 1
1-63
em = eccentricity of cable at middle of member (in
local y-axis)
ee = eccentricity of cable at end of member (in local
y-axis)
L = Length of member
2) The angle of inclination of the cable with respect to the local
x-axis (a straight line joining the start and end joints of the
member) at the start and end points is small which gives rise to
the assumption that
sin /θ
θ
=
=
dy dx
Hence, if the axial force in the cable is P, the vertical
component of the force at the ends is
and the
horizontal component of the cable force is,
Pdy dx(/)
P
dy
dx
1
2
−
⎛
⎝
⎜
⎞
⎠
⎟
Users are advised to ensure that their cable profile meets this
requirement. An angle under 5 degrees is recommended.
3) The member is analyzed for the prestressing/poststressing
effects using the equivalent load method. This method is well
documented in most reputed books on Analysis and Design of
Prestressed concrete. The magnitude of the uniformly
distributed load is calculated as
udl
Pe
L
=
8
2
where P = axial force in the cable
(
)
e
es ee
em=
+
−
2
L = length of the member
4) The force in the cable is assumed to be same throughout the
member length. No reduction is made in the cable forces to
account for friction or other losses.