Measuring tension in cables of Wind barrier structure supports fabric 1

[engABZ]

Hello,
I'm facing a problem in how to measure the tension developed in cables of Wind-barrier structure, that supports fabric cloth, I need it to control the tension that the cantilevered columns supporting the fence should handle without failing.

The fence to be 15 meter high and covered laterally with fabric cloth of 2m wide and spanning 25m between the two columns. Each fabric to be supported by two cables (top and bottom end.

Photos from google

http://www.nettingus.com/images/wind_barrier.JPG

http://www.nettingus.com/images/windscreen_9.JPG

I have thought of using (Catenary (sag-tension) approach) but couldn't really know how to apply it in my case. Also there will almost be no sag in the cables supporting the fabric, the real sag due to wind blowing, will be developed in the fabric (Almost 0 in top and bottom of each fabric and max. at the middle).

Any suggestions?
Regards

 

[BAretired]

engABZ,

Under wind load alone, the cable is not a catenary. It is a parabola.

F = wL2/8h

where:
F is the cable tension at midspan (or horizontal component throughout the span)
L is the span
h is the sag.

If you start with an initial tension, the initial sag can be calculated, knowing dead weight of fabric plus cable. In the case of dead weight, the cable is a catenary, but for simplification you might want to treat it as a parabola.

Sag increases as a result of strain from increased tension in the cable and deflection of vertical columns. It does not remain constant.

BA

BA

 

[BAretired]

Small typo in my last post.

F = wL2/8h should read F = wL²/8h

BA