Cable design. 1

[PEinVA]

A client would like for us to specify some 75' cables overtop of an outdoor terrace/sundeck, to string some lantern lights off of.
This is in the really early stages, but how do I go about designing something like this? My boss made it sound so easy, but the more I look at it, the more confused I get.

How do I find the resultant of the load that gets into the cable?

Thanks.

RC

RC
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke

 

[Lion06]

Roark has tables for a catenary. Page 245 (table 8.10 - in the seventh edition) gives reactions and tensions for a point load and a uniformly distributed load. I don't see one for several point loads, but take a lok and see what is appropriate for your case.

 

[PEinVA]

I myself do not have that book. I'll look around the office, see if we have a copy. Thanks for the tip.

Anyone ever design anything like this?

Do my assumptions sound correct?

Rick

RC
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke

 

[miecz]

Appendix A of AASHTO's Standard Spec forStuctural Supports for Highway Signs, Luminaires and Traffic Signals.

 

[COEngineeer]

If you have a PE study guide, it will have that topic that structuralEIT talked about.

Never, but never question engineer's judgement

 

[PEinVA]

2 years in.
No PE study guide here (yet). I'll look around the office for that as well.

RC
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke

 

[SlideRuleEra]

The information you are looking for is covered in detail on pages 36 thru 56 of "USS Wire Rope Engineering Hand Book". You can download a zipped .pdf version of this book from this page of my website:

http://www.slideruleera.net/miscellaneous.html

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[bridgebuster]

see if this design example helps

https://www.nysdot.gov/portal/page/...ion-issuance-system/ei-repository/ei89003.pdf

 

[swearingen]

The Beer & Johnston statics book has it as well. In my Vector Mechanics for Engineers Statics and Dynamics 2nd edition, it is on pages 272 through 284.

I would imagine most statics books have the equations...



If you "heard" it on the internet, it's guilty until proven innocent. - DCS

 

[JAE]

SlideRuleEra - always glad you hover around over us.