Parts of a Structure

Tension Members

Compression Members (Columns)

Bending Members

Shear and Moment

Combined Force Members (Beam-Column)

Connections

Typically have combination of moment and

shear and/or tension/compression

Standard Rolled Shapes http://www.youtube.com/watch?v=6xnKmt_gsLs

(HSS)

W-shapes

23-5/8”

or

23.6”

Nominally 24” deep

55 pounds

per foot (in length)

W24x55

Channels, Angles, Tees

C12 x 20.7 L 6 x 4 x 3/8 WT5 x 44

ST 4 x 9.2

Cold-Formed Shapes http://www.youtube.com/watch?v=b0tFln8_nIo

Tension Members

Bars

(round and

rectangular)

Cables Single and

double angles

A few examples of shapes typically used for

tension members

Compression Members

(HSS)

Flexural Members (Beams)

Flexural Members (Beams)

Structural Steels

Carbon Steels

Example: A36

High-Strength Low-Alloy Steels

Examples: A572 Gr. 50, A992

Alloy Steels

Example: A709

0.25 – 0.29% carbon

“mild steel”

36 ksi nominal yield stress

40 – 70 ksi, typ.

Carbon + small

amounts of

chromium,

copper, nickel,

etc.

80 – 110 ksi, typ.

Quenched and

tempered

Steel Properties

Strain

Str

ess

Carbon Steels, A36

High-Strength, Low-Alloy, A572

Heat-treated Alloy, A514

e ~ 0.0012

e ~ 0.015 e ~ 0.2 e ~ 0.3 – 0.35

Steel Properties

Strain

Str

ess

A36

A572 Gr. 50 or A992

Fy = 36 ksi

Fy =50 ksi Fu = 58 ksi

Fu = 65 ksi

See Part 2 of AISC Manual

Part 2 Steel

Construction

Manual

Steel Properties

Modulus of Elasticity

Poisson’s Ratio

Shear Modulus

Notch Toughness

E = 29,000 ksi

m = 0.3

t = G g G ~11,000 ksi

“material toughness”

s = E e