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S 235 JR characteristic values are R=360 [N/mm2] for Ultimate Strength and Rp0.2=360 [N/mm2] for Yield Strength.
In our prediction software the Safety Factors are calculated considering the Maximum Stress Limit equal to the
Yield Strength, according with many international standards and rules.
The resulting Safety Factor is the minimum of all the calculated safety factors, for each link or pin.
This is where you are working with a SF=7
Depending on local safety regulation and on situation the required
safety factor can vary. It is responsibility of the owner or rigger to
make sure that the system is properly rigged in accordance with
Country and local laws and regulations.
The “RCF Shape Designer” software gives detailed information of the
safety factor for each specific configuration.
The results are classified in 4 classes:
WARNING
• The safety factor is the result of the forces acting on fly bar’s and system’s front and rear links and pins and depends
on many variables:
- number of cabinets
- fly bar angles
- angles from cabinets to cabinets. If one of the cited variables change the safety factor MUST BE recalculated using
the software before rigging the system.
• In case the fly bar is picked up from 2 motors make sure that the fly bar angle is correct. An angle different from the
angle used in the prediction software can be potentially dangerous. Never allow persons to stay or pass under the
system during the installation process.
• When the fly bar is particularly tilted or the array is very curved the centre of gravity can move out from the rear
links. In this case the front links are in compression and the rear links are supporting the total weight of the system
plus the front compression. Always check very carefully with the “RCF Shape Designer” software all this kind of situa-
tions (even with a small number of cabinets).
System particularly tilted System very curved
-GREEN: SAFETY FACTOR > 7 SUGGESTED
-YELLOW 4 > SAFETY FACTOR > 7
-ORANGE 1.5 > SAFETY FACTOR > 4
-RED SAFETY FACTOR < 1.5 NEVER ADMITTED
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