- #1
arigger
- 5
- 0
I have been asking this question of everyone I meet and can't find a straight answer.
Imagine a wire rope anchored at both ends, spanning 50ft [15m].
That line is 'pre-tensioned' to... say 500 lbs. [2kN].
The idea is that it is pulled fairly 'flat'.
What happens to the line tension when I apply a load vertically at the mid-point? How about three loads at quarter points?
Do I need to consider the catenary effect or can I work this out free-body style?
Is there one end-all be-all formula for this? Will I be able to read it/ perform the functions required?
I know several ways to get the answer if I know how much sag is in the line or if there is a known vertical component, what entertainment riggers call a 'bridle'. But starting with a 180 degree triangle seems to get me nowhere.
Thanks for looking
[ ]
Imagine a wire rope anchored at both ends, spanning 50ft [15m].
That line is 'pre-tensioned' to... say 500 lbs. [2kN].
The idea is that it is pulled fairly 'flat'.
What happens to the line tension when I apply a load vertically at the mid-point? How about three loads at quarter points?
Do I need to consider the catenary effect or can I work this out free-body style?
Is there one end-all be-all formula for this? Will I be able to read it/ perform the functions required?
I know several ways to get the answer if I know how much sag is in the line or if there is a known vertical component, what entertainment riggers call a 'bridle'. But starting with a 180 degree triangle seems to get me nowhere.
Thanks for looking
[ ]