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Depending upon exactly how the PLS-CADD report was generated, it could include either Actual loads or Factored load.Īdditionally the structural engineer may want to verify whether the report contains loads calculated for the expected geometry, or whether the report is based on expected geometry plus allowable field tolerances. For a realistic model, PLS-CADD would instead apply realistic loads to calculate the realistic pole deflection, then check that the pole is using no more than 25% of the strength. For example, applying 4.0 wind load factor may result in 16x defection at the top of a pole in a FE analysis. Although load factors work reasonably well for linearized hand calculations, the don't work when modeling real equipment using finite element analysis program such as PLS-CADD. PLS-CADD can do designs based on either using load factors per NESC table 253, or be using strength reduction factors. Using just a printed report from any computer program is dangerous without verifying the assumptions that went into the report. It would certainly prudent for the structural person to do an approximate hand calculation for one of the anchors.
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RE: Pole Guy and Anchor Design bacon4life (Electrical) 13 Jul 16 20:27 I was thinking what for should he validate the forces reported at the guy limit at the grade level?Īm I missing anything and my structural person does not know what he is doing and he might be asking too much or crossing over into our electrical world.
#Sag tension limit in pls cadd software#
To my surprise he wants to validate the sag and tensions and validate the forces calculated by the software c/o our power line engineer who is currently on leave. I have given this to our structural person to specify and guy anchors based on the vertical and horizontal forces shown UP TO THE GRADE LEVEL as indicated in PLS-CADD report so he can size the anchor and specify the depth based on soil properties. In one of the diagrams the guy is shown up to the grade level only with the forces and angles shown. The pole guys are located including their leads, angles and forces based on the vertical and horizontal loading forces based on PLS-CADD calculations.
#Sag tension limit in pls cadd code#
He provided both sag and tension and pole layout (with hardwares modelled correctly as per Utility Code and IEEE and as oer our client's transmission standards). Our power line engineer designed the extension using PLS-CADD and PLS Pole. We have worked on a power line extension design at 34.5 kV only.