Linear And Non-Linear cable analysis (and output data)
Linear And Non-Linear cable analysis (and output data)
(OP)
Hello
I want to use STAAD cable analysis to analyze a cable (pinned support at both ends) having udl all over the span (20-30)m.
I don't know the unstressed length (is it the length of cable before loads are applied?), so I think I can't do Non-linear analysis.
So in this case would be the linear analysis accurate enough?
For linear analysis, the output shows a list of iterative steps, and in each step it provide a (% of load), iterations ends with 100% use of load. Does this part of output has something that I should consider? (What is it telling me?)
Thanks in advance
I want to use STAAD cable analysis to analyze a cable (pinned support at both ends) having udl all over the span (20-30)m.
I don't know the unstressed length (is it the length of cable before loads are applied?), so I think I can't do Non-linear analysis.
So in this case would be the linear analysis accurate enough?
For linear analysis, the output shows a list of iterative steps, and in each step it provide a (% of load), iterations ends with 100% use of load. Does this part of output has something that I should consider? (What is it telling me?)
Thanks in advance





RE: Linear And Non-Linear cable analysis (and output data)
RE: Linear And Non-Linear cable analysis (and output data)
Has anyone verified the behavior of the STAAD cable element compared to hand-calc catenary cables or another respected program that does non-linear cables(SAP?).
If you were talking about using simple straight line guyed cables, that would be one thing. But, applying a transverse distributed load. That requires a bit more advanced behavior. I'd want to have a really good verification problem proving STAAD's capabilities in this arena before I would use it.
RE: Linear And Non-Linear cable analysis (and output data)
So you recommend using SAP in this case?
Have you used it before for similar situation?
RE: Linear And Non-Linear cable analysis (and output data)
It's really just that cable elements loaded transversely are highly non-linear.
If you choose to use STAAD, I don't necessarily have a problem with that. But, given their historic weaknesses related to non-linear analysis I would look at those results a bit more closely. In fact, I'd start of by running some very detailed verification problems on these types of elements. Ones where I have a known solution that I can confirm against the program results.