Dinusha

G10, G11 and G12

G10 Structural steel framing G11 Structural aluminium framing G12 Isolated structural metal members

SMM7 standard - G Structural/Carcassing metal/timber

Generally

G10: Structural steel framing deals with structural steelwork, the members being fabricated together into framing for structural elements of the building or for the building as a whole; and protective coatings to the steelwork, which may be applied on site or off site.

G11: Structural aluminium framing deals with structural aluminium, the members being fabricated together into framing for structural elements of the building or for the building as a whole.

G12: Isolated structural metal members deals with structural steel or aluminium standard sections or fabricated joists/trusses which are incorporated into the building structure individually rather than being framed together.

G10 Rule P1(a)–(c)

Refer to General rules.

G10 Rule M1

When weighting steelwork, fittings are not included within the weights.

G10 Rule M2

Fittings are grouped together under one heading regardless of which members they pertain to.

G10 Rule M3

No deducts are made to the weight of steelwork for notches or holes not exceeding 0.10m2 measured on the surface.

G10 Rule M4

When calculating the weight of steelwork no allowances are made for bolts, etc. Only the basic steel members are included in the measurement.

G10 Rule M5

When measuring steel which does not have a specific weight, i.e. kg/m, then the weight is calculated at 7.85 t/m3 (based on volume).

G10 Rule M6

The weight of isolated members is calculated in the same way as framing members.

G10 Rule M7

As stated.

G10 Rule M8

Localised protective coating; the specifics should be detailed or described to suit the particular circumstance. This is only measured to structural aluminium framing (G10 Rule M8). Localised protective coatings are used to isolate the structural framing from potential corrosive materials (G10 Rule D10).

G10 Rule D1

Framing items G10.1–12.* includes all work up to and including delivery on site.

G10 Rule D2

Hot-rolled purlins and cladding rails form part of the main structure and are measured by weight in G10.1.4.*, cold-rolled rails are measured linearly under G10.4.1.

G10 Rule D3

Wires, etc. are part of the main structure and contribute to the structural effect of the framing.

G10 Rule D4

Special bolts, etc. serve specific functions other than standard connections, such as chemical anchor bolts. These are enumerated and described in accordance with G10.1.12.1.

G10 Rule D5

Refer to G10.2.*.

G10 Rule D6

Permanent formwork is formwork to concrete which is not removed and forms a structural function connected with the overall structural performance of the building/steelwork design. An example of this would be hollow rib steel decking.

G10 Rules D7–D8

Isolated plain members refers to the members as indicated in the items

G10.1.2–4.*.

These are individual members as opposed to being part of an overall structure.

G10 Rule D9

Fixing bolts refer to connection between steel and other structures, not steel to steel connections.

G10 Rule D10

Localised protective coating; the specifics should be detailed or described to suit the particular circumstance. This is only measured to structural aluminium framing (G10 Rule M8). Localised protective coatings are used to isolate the structural framing from potential corrosive materials (G10 Rule D10).

G10 Rule C1

Bolts, etc. used in steel to steel connections are deemed to be included in the item.

G10 Rule C2

Isolated structural members are all inclusive. The item refers to supplied and fixed sections of steel.

G10 Rules S1–S3

These need to be specified and included in the description of work where they apply.

G10 Rule S4

When measuring, surface preparations and treatments need to be specified and included in the description. The timing is necessary to determine the sequence of operations, particularly in the context of applied finishes, such as factory applied.

G10.1.1.*.*

Columns are steel members which span from floor to floor, i.e. vertical members.

G10.1.2.*.*

Beams are horizontal members which span across floors, roofs, over windows, etc. supported by columns.

G10.1–4.1–3.*

All steel members are measured based on weight. This requires the measurement of the linear length of the steel and the application of the specific weight (kg/m). Note that weights are given in kilograms, therefore these need to be converted into tonnes (1,000kg = 1 tonne). Profiles are given as follows:

e.g. UC 254 x 254 x 132
or 254 x 254 UC132

UC: Universal Column (this indicates the profile/shape)
254 x 254: Physical size 254mm x 254mm (height x width)
132: Weight per linear metre (in kgs).

G10.1.2.*.1

Castellated beam

G10.1.2.*.2

Tapered beam

G10.1.2.*.3

Curved beam. Refer to the diagram in G10.1.9

G10.1.2.*.4

Cambered beams are beams which have a slight curve in the beam’s running length.

G10.1.2.*.5

Hollow beams are beams fabricated ‘box’ shaped and the shape is to be stated in the description.

G10.1.3.*

G10.1.4.*

G10.1.5.*

Grillage consists of a grid of beams bearing on piles. These act in a similar way to concrete ground beams. These beams are then cast over in concrete to form part of the floor slab.