CHCalcHandbook

Circle — Solid and Pipe Section

Section Properties · Circle & Hollow Circle (Pipe) · A, I, S, r, Z, J
1

Geometry

Outer diameter D; for the pipe, inner diameter d (or wall thickness)
Axes: fully symmetric section — every centroidal axis is a principal axis; Ix = Iy, J = 2Ix.
2

Geometric properties

Area, centroid, moment of inertia, elastic section modulus, radius of gyration
3

Plastic modulus and torsion

Zx, Zy, shape factor, J
4

Principal axes

Ixy, θ, I₁, I₂