Page 90 - SMM2 eBOOK

N.3 Generally (cont'd)

3. The following panticulars shall be given in the descriptions of single members and built up
members:

a. The structural function and position in the work (e.g. beams, girders, columns,
stanchions, roof trusses, etc.)
b. The number required, section type, size, length and total weight of single members
and of the components of built-up members.
c. The components of a built-up member shail be listed within the description of the
member giving particulars of each different component as clause N.3.3.b.
d Proprietary members or components shall be described in accordance with the
supplier's catalogues.
e. Curved, cambered or cranked members shall each be so described
f. Steel gutters in conjunction with structural steelwork shall be given in accordance
with clauses C.4-6.

N.4 Designation of members

1. The sizes of members and components shall be designated as follows:

a. By serial size and weight per metre for universal beams, universal columns and
universal structural tees.
b By nominal size and weight per metre for joists, channels and tees.
c. By actual size and thickness for angles and hollow sections.
d. By dimensions and thickness for other sections and flat plates. In the case of plates
having a raised pattern the thickness shall be given net, excluding the thickness of
the pattern.
e. By weight per metre for bridge and flat bottom rails.

2. Each member differently described in accordance with clause N.3.3 shall be given
separately.

N.5 Weights of steelwork

1. Where a weight per cubic metre for mild steel is not specified it shall be assumed for the
purposes of calculation to be 7.85 tonnes per m3.

2. In computing the weight of steelwork comprising a member or component under clause
N.3.3, no deductions shall be made for splay cuts, mitres, notches, holes and slots and no
allowance shall be made for rolling margin or for the weight of weld metal. The weight of
irregularly shaped plates shall be computed net.

N.6 Lengths of members

The lengths of members and components stated in accordance with clause N.3.3.b shall be
overall lengths with no deductions shall for splay cut or mitred ends. Separate particulars shall
not be stated for members or components whose length differs from the stated length by less
than 300mm. Members which may be supplied in any length at the discretion of the Contractor
shall be so described stating the total length

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