Section Capacity

As described in the RAM Manager documentation the engineer can specify whether hollow structural sections are of class C (cold-formed non-stress-relieved) or Class H (hot or cold-formed stress-relieved). The engineer can also indicate whether built-up flange sections are comprised of milled plate or flame cut plate. These designations affect the axial capacity of the HSS and flange sections as specified in Clause 13.3.1 of the design specification.

The calculation of shear area of a circular hollow section is according to Gere and Timoshenko, Mechanics of Materials, 3^rd edition, Section 5.5 as follows:

A_{v} = \frac{3}{4} A (\frac{r_{2}^{2} + r_{1}^{2}}{r_{2}^{2} + r_{2} r_{1} + r_{1}^{2}})

where

r₁ and r₂

the inner and outer radius of the CHS respectively