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# RE: Cable Tension Force

• To: <seaint(--nospam--at)seaint.org>
• Subject: RE: Cable Tension Force
• From: "Brian K. Smith" <smithegr(--nospam--at)bellsouth.net>
• Date: Mon, 9 Dec 2002 09:23:34 -0600

>From Roark's Formulas for Stress and Strain, 6th Edition, Table 12, page
179:

For a perfectly flexible cable with pinned ends and unstretchable length L,

y_max = L(3wL/(64EA))^(1/3)

and

P (tension in cable) = wL^2/(8y_max)

As you can see, P increases as y_max decreases.

Brian K. Smith, P.E.

> -----Original Message-----
> From: Oshin Tosounian [mailto:oshin(--nospam--at)kcematrix.com]
> Sent: Sunday, December 08, 2002 11:43 PM
> To: 'seaint(--nospam--at)seaint.org'
> Subject: Cable Tension Force
>
>
> Does anyone have the formula to calculate the tension force in a cable to
> keep it from sagging under its own weight handy?
> I have a single span condition and a multiple span condition
> where the cable
> is free to slide over the intermediate supports. The supports are
> at varying
> heights.
>
>
> Oshin Tosounian, S.E.
> Los Angeles, CA
>
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