Cable Loads

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Tension at midspan in a cable supporting load uniformly can be expressed as

H = w L² / (8 d)      (1)

where

H = midspan tension (kip, N)

w = load on a unit horizontal distance (klf, kN/m)

L = span (ft, m)

d = sag (ft, m)

Tension at support ends can be estimated as

T = (H² + (w L / 2))^0.5    (2)

where

T = tension at supports (kip, N)

Length of cable can be approximated as

S = L + 8 d² / (3 L)       (3)    

where

S = cable length (ft, m)

• kip = 1000 lb

• klf = kip per linear foot

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Related Topics

• Mechanics - Kinematics, forces, vectors, motion, momentum, energy and the dynamics of objects

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