Draft

10.5SlenderSection 179

Draft











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5  5  

67

89 : 89 ;<:;= 9 >

?@A

89 :

6

<

A

89 :

BC

DEC

FG

I2J EH

K#'" 3 L 2 M

Figure10.7: NominalMoments forCompactandPartiallyCompactSections

where:

Mr ResidualMoment equalto (FyFr)S

 bf= 2 tfforI-shapedmember
angesand

hc=twforbeamwebs.

22 Allotherquantitiesareas denedearlier. Notethatwe usetheassociatedwiththeone

beingviolated(orthelower of thetwo if bothare).

10.5 SlenderSection

23 If thewidthto thicknessratioexceedsrvaluesof
angeandweb,theelement is referred

to as slendercompressionelement. Sincetheslendersectionsinvolve a dierent treatment, it

willnotbe dealthere.

10.6 Stress-straindiagramformoststructuralsteels

Example10-1: ZforRectangularSection

Determinetheplasticsectionmodulusfora rectangularsection,widthbanddepthd.