BS 4:1993 pdf free download.Structural steel sections Part 1 . Specification for hot-rolled sections.
1 Scope
This Part of BS 4 specifies the dimensions and mass of the following hot-roiled structural stee sections:
universal beams universal columns universal bearing piles joists
structural tees cut from universal beams
structural tees cut from universal columns channels
Mass, length and depth tolerances for taper flange joists and channels are a]so given.
NOTE. Dünensional, mass, length and straightness tolerances for universal beams, columns and bearing piles are given in
BS EN 10034.
2 Normative reference This Part of BS 4 incorporates, by reference, provisions from another publication. The normative reference is cited at the appropriate point in the text and the publication is given on the inside back cover. Subsequent amendments to, or revisions of, this publication apply to this Part of BS 4 only when incorporated in it by updating or revision.
3 Designation
A section shall be designated by the serial size in millimetres (mm) and the mass per unit length in kilograms per metre (kg/rn).
This form of designation shall be used in any enquiry and order.
Example
a beam of 920.5 mm x 420.5 mm at 388 kg/rn is designated 914 x 419 x 388 beam.
4 iblerances on universal beams, columns and bearing piles Dimensional, mass, length and straightness tolerances on universal beams, columns and bearing piles shall be as given in BS EN 10034.
5 Mass and length tolerances for joists and channels
5.1 Mass
Iblerances shall be applied to the actual mass per unit length of the joist or channel.
The rolling tolerances shall be either:
a) ± 2.5 % ofthe actual mass per unit length; or
b) + 5 % of the actual mass per unit length where a minimum mass per unit length is ordered.
5.2 Length
Joists or channels ordered as ‘specified’ or as ‘exact’ lengths shall be supplied as follows.
a) Specified lengths. When a joist or channel is to be cut to a specified length, it shall be cut to within ± 25 mm of that length. When a minimum length is specified, it shall be cut to within ‘ mm of that minimum length.
b) Extict lengths. When a section is to be cut to an exact length, it shall be cold sawn to within ± 3.2 mm of that length.
6 7.blerance on depth of section for
joists and channels
The tolerance on the nominal depth of section shall be as given in table 1.
7 Dimensions of hot-rolled structural steel sections
— The noitinal dimensions of hot-rolled structural—
steel sections shall be as given in tables 2 to 8.