aluminium in commercial vehicles - European Aluminium Association

EUROPEAN ALUMINIUM ASSOCIATION ALUMINIUM IN COMMERCIAL VEHICLES CHAPTER VI 67
Situations Ref. EN 1999-1-1 Resistance
Torsion 6.2.7
Bending and
shear
Bending and
axial force
Bending, shear
and axial force
6.2.7.2
6.2.7.3
The design St. Venants torsion moment resistance without warping:
T Rd = W T,pl . f o
√3 . γ M1
W T,pl is the plastic torsion modulus
For torsion with warping the capacity is the sum of two internal
effects. For combined shear force and torsional moment the
capacity is given by a reduced shear capacity.
6.2.8 The shear force will reduce the moment resistance. If the shear
6.2.9
6.2.9.1
6.2.9.2
6.2.9.3
force is less than half of the shear force resistance, the effect
of the moment resistance is so small that it can be neglected.
Formulae are given for the combined effect of an axial tension
and bending moments about one or two axis for:
• open cross-sections
• hollow sections and solid cross-sections
• members containing localized welds
6.2.10 The shear force will reduce the combined axial tension and
moment resistance. If the shear force is less than half of the shear
force resistance, the effect of the combined axial tension and
moment resistance is so small that it can be neglected.
Web bearing 6.2.11 This is for design of webs subjected to localized forces caused
Compression
(buckling
resistance)
by concentrated loads or reactions applied to a beam.
6.3 Members subject to axial compression may fail in one of the
three ways listed below:
• flexural
• torsional or flexural torsional
• local squashing
The design buckling resistance of a compression member is:
N b,Rd = κ . χ . A eff . f o
γ M1
κ is a factor to allow for effect of the HAZ at welds
χ is the reduction factor for the relevant buckling mode
A eff is the effective area of the cross section. (For cross section class
1, 2 and 3 this is the gross cross-section, for cross section class 4
it is reduced for local buckling effects)