Structural Steel

DR. Nabil Dmaidi

Type of Steel

 Designated by the letter “A” followed by the American Society for Testing and Materials (ASTM) designation number.

The principal types of structural steel include: – A36 carbon structural steel – A572 high-strength low-alloy structural steel – A588 corrosion-resistant high-strength low-alloy structural steel.

DR. Nabil Dmaidi

Table 1, Rolled-steel shape designations

Type fo shape

W shape S shape M shape American St andard Channel Miscellaneous Channel HP (bearing pile) shape Equal leg angle Unequal leg angle Plat e Weight: 40.8 lb/sq. ft/ in 1’ 1’ DR. Nabil Dmaidi

Example designat ion

W27 x 114 S20 x 95 M8 x 25 C12 x 30 MC 12 x 50 HP 14 x 8 9 L 6 x 6 x 1/2 L 8 x 4 x 1/2 PL 1/2 x 12 1”

Steel Sections: Channel C 8x11

C 8 weight = channel = nominal depth = 11.5 #/Lf Use:  beams and built-up members DR. Nabil Dmaidi

Steel Sections: Angle L 5 x 3 x 5/8

L 5 3 5/8 = angle = length of one leg = length of another leg = nominal thickness need to look up #  Bracing and build-up members DR. Nabil Dmaidi

Structural WT 7 x 49.5

ST 9 x 35

WT 7 = cut from wide flange (14 x 90) = nominal depth 49.5 = #/lf ST = cut form S beam (18 x 70) Use:  Build-up sections DR. Nabil Dmaidi

Wide Flange W14 x 90 14 WF 90 W 14 = wide flange = nominal depth 90 = #/lf use: beam and column

Standard Beam S18 x 70 18 I 70

S 18 = standard = nominal depth 70 = #/lf use: beam, not column DR. Nabil Dmaidi

Estimating Tips

 Nominally taken off and priced by weight  Group for take off by: – Grade of steel – Type of section or member – Method of tied connection – location  Maintain consistent sequence of take off. Common: – Columns and detail – Beams and detail (floor by floor) – Bracing and flooring DR. Nabil Dmaidi

Pricing

 Depends on where material is purchased.

– Mill price apply to large orders.

– Warehouse price apply to small orders from local supplier.

 Prices are as of time of delivery. Need escalation clauses to be clearly set forth.

 Price is made up a base plus extras.

DR. Nabil Dmaidi

Pricing Structural Shapes

 Prices are expressed in cents per pound.

 W14x95 - 32.68 ft, A36 steel (3104.6#) – – Base Dimension: – – Pack Mark – Load shape length-quantity 17.00

0.45

1.00

0.00

0.00

0.20

18.65

DR. Nabil Dmaidi

Example Drawing for Structural Steel Take-Off W14x 43 W14x 68 W14x 68 W14x 43 All Columns this Row W24 x 68 W18 x 40 W18 x 50 W18 x 40 W18 x 70 W18 x 70 NOTE: All columns are 12’0” in length W18 x 70 W18 x 70 W14x 43 20’0” W14x 68 30’0” DR. Nabil Dmaidi 30’0” W18 x 40 W18 x 50 W18 x 40 W14x 43 20’0” All Columns this Row W24 x 100 All Columns this Row W24 x 100 All Columns this Row W24 x 100 N All Columns this Row W24 x 68

Table 2, List of Steel Quantities

Sect ion

W 14 x 43 W 14 x 68 W 18 x 40 W 18 x 70 W 18 x 50 W 14 x 43 W 14 x 43 W 18 x 84 W 18 x 84 W 14 x 103 W 24 x 68 W 24 x 100

Number Lengt h (ft ) Tot al Lengt h Wt ./ft Tot al Wt . (lb)

4 20.0

8 0 43 3440 4 4 30.0

20.0

120 8 0 6 8 40 8160 3200 4 2 4 30.0

20.0

28.0

120 40 112 70 50 43 8400 2000 4816 4 4 4 2 10 14 14.0

28.0

14.0

28.0

12.0

12.0

56 112 56 56 120 168 43 8 4 8 4 103 6 8 100 2408 9408 4704 5768 8160 16800  The cost of plates and connectors (bolts or welding) are not included.

DR. Nabil Dmaidi