Communication Cable and STAAD
Communication Cable and STAAD
(OP)
I am trying to model a communication (Telephone cable), in STAAD, strung between to points which are not at the same elevation. I know the properties of the cable (Area, Density, Modulus of Elasticity and initial tension at two ends under the self loading) but I don't know the sag and the cable length . I have used the "CABLE" element in the STAAD and was expecting that the cable will sag under its own weight and then I'll be able to get the maximum sag, but it seems that the "cable" element is not any different from truss element and it does not give any deflection under the self weight. Could somebody advise if there is any other way of modelling the cable and to find out the resultant sag, or could somebody suggest a good literature for hand calculations. I can only find literature for cables without initial tension and with ends at same elevations. Could somebody help. Thanks






RE: Communication Cable and STAAD
RE: Communication Cable and STAAD
RE: Communication Cable and STAAD
RE: Communication Cable and STAAD
The basic equation is T=w*l^2/(8*d) where T is horizontal tension, w is self weight, l is horizontal span length, d is sag at midspan.
I don't have my reference in front of me to find the equation for inclined cables or total cable length, but you should be able to find it with a quick google search.
It's overkill for this, but having an old copy of an EE handbook around (https://www.amazon.com/gp/product/007020974X/ref=o...) is handy.
RE: Communication Cable and STAAD
initialfinal sag underself weightfull loading and model it along that curve. Take a look at the sagging cable section 1/3 of the way down the page RISA Modelling TipsRE: Communication Cable and STAAD
Page 50 shows what I understand to be the conditions you are interested in:
Page 50 refers to equations on Page 43:
The section of the book concerning the diagrams shown above begins on Page 38.
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RE: Communication Cable and STAAD
RE: Communication Cable and STAAD
http://rmniall.com/downloads/software-downloads/#L...
RE: Communication Cable and STAAD
First ensure that you have the license for the Advanced Analysis Plus Engine. Secondly you should be using the advanced nonlinear cable analysis ( PERFORM CABLE ANALYSIS ) which is only available if you have the license mentioned above.4
If you have the license and you are using the advanced non linear cable analysis and still not getting any deflection, please upload your .std file and I will take a look.