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Section Classification of 'Non-Welded' Thin Elements [BS 8118-1: 1991]

Created: 28-July-2012 by: I.R. Itum

Unreinforced Flat Elements

01. Internal Elements Under Uniform Compression01-1. Farthest Element

b 60mm flat width of the elementCompression Side

t 2.5mm the thickness of the element

y1 97.94mm the distance of the most severelystressed fiber from the NA of the grosssection.

M

y2 96.14mm the distance of the element under consideration from the NA. Tension Side

po 160MPa limiting stress

250MPa

p o

y1

y21.262 stress parameter

b t 24 width to thicknessratio 1 18 22.71 lower limit of slenderness ratio for internal unwelded element Table 4.3, BS

8118-1:1991 o 22 27.756 higher limit of slenderness ratio for internal unwelded element Table 4.3, BS

8118-1:1991 Element Classifica tion Clause 4.3.3.4, BS 8118-1-1991

"Fully Compact" 1 if "Semi-Compact" 1 o if "Slender" o if

"Semi-Compact"

Effective thickness

x 19.023

k L min32 x

220

x 2

1.0

1 thickness reduction factor for unwelded internal element Figure 4.5, curve C& Table K.1 (curve C), B1 8118-1-1991

teff k L t 2.5mm

effective thickness

by: I.R.Itum, C.E. Section Classification BS 8118-1-1991.xmcd1/5