įor cold-formed square and rectangular hollow sections, the sectional properties have been calculated, using the external corner radii of 2 t if t ≤ 6 mm, 2.5t if 6 mm 10 mm as specified by BS EN 10219-2. 3.3.1 Common propertiesįor comment on second moment of area, radius of gyration and elastic modulus, see Section 3.2.1, 3.2.2 and 3.2.3.įor hot-finished square and rectangular hollow sections, the sectional properties have been calculated, using corner radii of 1.5 t externally and 1.0 t internally, as specified by BS EN 10210‑2. For the same overall dimensions and wall thickness, the section properties for hot-finished and cold-formed sections are different because the corner radii are different. The section ranges listed are in line with sections that are readily available from the major section manufacturers.
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The ranges of hot-finished and cold-formed sections covered are different.
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Section properties are given for both hot-finished and cold-formed hollow sections. The equivalent slenderness coefficient ( ϕ a ) is calculated as follows:ĭefinitions of all the individual terms are given in BS 5950-1, Clause B.2.9. The larger value is based on the major axis elastic modulus ( Z u) to the toe of the short leg and the lower value is based on the major axis elastic modulus to the toe of the long leg. Two values of the equivalent slenderness coefficient are given for each unequal angle. The equivalent slenderness coefficient ( ϕ a ) is tabulated for both equal and unequal angles. 3.2.7 Equivalent slenderness coefficient ( ϕ a ) and monosymmetry index ( ψ a ) The formulae concerned are complex and are therefore not quoted here. If n is greater than the change value, the formula for higher values of n must be used. When the value of n is less than the change value, the formula for lower values of n must be used. For minor axis bending the position of the plastic neutral axis when there is no axial load may be either in the web or the flanges. Where the stresses are of the same kind, an initial increase in axial force may cause a small initial rise of the “reduced” plastic modulus, due to the eccentricity of the axial forceįor each section there is again a change value of n. The reduced plastic modulus of a parallel flange channels bending about the minor axis depends on whether the stresses induced by the axial force and applied moment are the same or of opposite kind towards the back of the channel. The value of the reduced plastic modulus takes account of the resulting moment due to eccentricity relative to the net centroidal axis. In calculating the reduced plastic modulus of a channel for axial force combined with bending about the minor axis, the axial force is considered as acting at the centroidal axis of the cross‑section whereas it is considered to be resisted at the plastic neutral axis.