Polar UCS explained

This topic will explain using polar UCS in 2D results dialog (see "Parameters for display of results")

UCS polar option is beneficial for circular, semi-circular or curved slabs. When using this option, all internal forces will be recalculated in tangential and radial direction with centre according to user defined UCS. This values should be used when user will decide to design reinforcement in tangential and radial directions (outside of Scia Engineer). See images below and notice the different internal forces for Local and Polar UCS.

semi-circular slab

UCS local, internal forces mxD-

UCS polar, internal forces, mtD-

User should avoid to use sections with averaging values, in near proximity to centre of polar UCS where big peak values can appear (due the singularity in the centre of polar UCS) and return distorted values.