Benchmark 38: Access Steel Document SX022a-EN-EU

Project file: Benchmark_(EC_EN_1993)_38.esa

SCIA Engineer Version R18.1

Introduction

This benchmark concerns the example SX022a-EN-EU Calculation of effective section properties for a cold-formed lipped channel section in bending of Access Steel, http://www.access-steel.com/, 2005.

This example deals with the effective properties calculation of a cold formed lipped channel section subjected to bending about its major axis.

Reference Results

The reference gives following results:

Local Buckling calculation
Part	[mm]				[mm]	[mm]	[mm]
Flange	72	4,0	0,789	0,914	65,8	32,9	32,9
Edge fold	19,8	0,5	0,614	1,00	19,8

 

Distortional Buckling calculation - Iteration 1
As	103,3 mm²
Is	3663 mm^4
b1	61,73 mm
hw	198 mm
kf	0
K	0,439 N/mm^2
σcr	355,78 N/mm^2
	0,992
χd	0,753

 

Distortional Buckling calculation - Iteration n
be1	32,9 mm
be2,n	35,9 mm
ceff,n	19,8 mm
χd,n	0,737

 

Local Buckling calculation
Part	[mm]				[mm]	[mm]	[mm]
Web	198	22,58	0,914	0,959	97,5	39	58,5

 

Effective section properties
Aeff	689,2 mm²
Ieff,y	4140000 mm^4
Weff,y,c	40460 mm^3
Weff,y,t	43260 mm^3

 

SCIA Engineer Results

Result for the initial calculation i.e. without stiffener iterations:

Result using stiffener iterations:

Comments

• The results correspond to the benchmark results.
• The reference ignores the fact that the principal axis is not parallel to the flanges (alfa = -1,47 deg). As a result, the top flange is not in uniform compression but subject to a stress gradient. SCIA Engineer accounts for the actual stress distribution leading to small differences in the results.
• The reference does not detail the calculation of b₂.
• The reference does not detail the different stiffener iteration steps.