WEIGHTS OF STRUCTURAL STEELWORK FOR VARIOUS FORMS OF STRUCTURE

Unless noted otherwise the figures given are in units of kg / m³.

Where two figures are given, e.g. 6.0 / 0.5, the first represents the quantity of HRS and the second CFS

TYPE OF STRUCTURE

GRADE OF CONSTRUCTION

LIGHT

MEDIUM

HEAVY

Single Span -

Multi-Span -

4.5 / 0.6

5.5 / 0.8

6.6 / 1.2

HEAVY - tiled roof and or heavy services

Single Span -

Multi-Span -

7.2 / 0.8

8.2 / 0.8

11.0 / 0.8

Heavy - cranes over 20t + nominal services

Without Cranes -

With Cranes -

6.0 / 0.5

7.0 / 0.5

of a load sharing system for local crane loads.

Turbine Hall -

Canteen / Toilet Blocks -

10

Buildings with Plant and Cranes -

HEAVY - heavy iron and steel making plants

Low Rise -

High Rise -

HEAVY - grids >8m and or heavy floors and roof

Stadium (no accommodation) -

for by using other relevant data given in this table

With Front Columns -

Seating Support Steel only -

45 kg/m2

60 kg/m2

90 kg/m2

HEAVY - grids above 6m x 12m

HEAVY - grids about 7.8m x 16.5m

With light weight concrete floor -

With steel plate floor -

70

80

115

HEAVY > 20m span

CADOSS ^(R)

Project
Useful Data

Job Ref
WS2001.001

Part of Structure
Building Weight / Cost Example

Calc Sheet No. / Rev
Blg. Wt. / 1

Drawing Ref
n / a

Calc By
M.G.D

Date
Jan 2002

Check By

Date

Example 1 - Single Storey Multi-Span Retail Unit

 The main steel framed building measures 75m wide x 150m long x 10m mean roof height. Inside the main frame is a two-storey steel framed office and facilities block measuring 6m wide x 25m long which has two storey's of 3m height. Our client requires a budget estimate for the structural steel frame:-

Our choice of framing for this project would be a three bay, UB section, portal frame with spans of 25m and a roof pitch of 10deg. Main frames would be spaced at 6m centres. The small office section would be framed with UB beams and UC columns on a 5m x 6m grid, secondary beams at either 2.5m or 3m centres may be used depending on the type of floor units used. Cold formed sections will be used for roof purlins and cladding rails. From the building weights table the type of structure will be Medium duty Multi-Span Shed for the main frame and Light Office for the internal facilities block.

Volume of main building

= 75m x 150m x10m

= 112500m³

Volume of office and facilities block

= 6m x 25m x 2No. x 3m

= 900m³

Weight of, hot rolled, steel in main frame

= 112500m³ x 5.5kg/m³

= 618750kg

Weight of, hot rolled, steel in office block

= 900m³ x 8kg/m³

= 7200kg

Weight of, cold formed, steel in main frame

= 112500m³ x 0.8kg/m³

= 90000kg

Total weight of structural steelwork

= 715950kg

= 716 Tonnes

For this type of structure in the UK a keen fabricator would probably quote a little under £1000 / t to supply, deliver and erect the building frame. So for our budget price we will assume £1000 / tonne.

Total cost of structural steelwork

= 716t x £1000 /t

= £716,000.00

_____________________________________________________________________________

2. Rates per tonne for structural steelwork vary widely from one fabricator to another. Rates also vary up and down depending on the economic situation at the time. Once you have your estimated tonnages it would be well worth ring around a couple of fabricators to find out their latest rates. Don't forget to give your fabricator the tonnage breakdown and tell him that fitting, bolts and welds are allowed for in your tonnages.

Document (No. 20011229/WS/002)

.MG Double © 2002