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Steel Designers Manual - TheBestFriend.org

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This material is copyright - all rights reserved. Reproduced under licence from The <strong>Steel</strong> Construction Institute on 12/2/2007<br />

To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.<strong>org</strong>/<br />

<strong>Steel</strong> <strong>Designers</strong>' <strong>Manual</strong> - 6th Edition (2003)<br />

192 Other structural applications of steel<br />

5.3.2 Special features<br />

5.3.2.1 Elementary cable mathematics<br />

Load–extension relationship<br />

Extension<br />

e TL<br />

=<br />

AE<br />

where T = load in cable<br />

L = length of cable<br />

A = cross-sectional area<br />

E = Young’s modulus.<br />

Typical values for materials are given in Table 5.1.<br />

The E value for wire rope applies after the construction stretch has been pulled<br />

out of wire rope by load cycling to 50% of the ultimate tensile strength. In wire rope<br />

the construction stretch can be as much as 0.5%. This is of the same order of magnitude<br />

as the elastic stretch in the cable at maximum working load.<br />

Circular arc loaded radially (Fig. 5.24)<br />

Tension T = PR<br />

where P = load/unit length radial to cable<br />

R = radius of cable.<br />

Radius of circular arc, R (Fig. 5.25)<br />

Radius R S 2 d<br />

= +<br />

8d2 Table 5.1 Material properties<br />

Material E Ultimate<br />

(kN/mm 2 ) tensile<br />

strength<br />

(N/mm 2 )<br />

Solid steel 210.0 400–2000<br />

Strand 150.0 2000<br />

Wire rope 112.0 2000<br />

Polyester fibres 7.5 910<br />

Aramid fibres 112.0 2800

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