1. COMPRESSION MEMBERS AS COLUMN
• Column, top chords of trusses, diagonals and
bracing members are all examples of compression
members
2. VARIOUS TERMS USED FOR
COMPRESSION MEMBER
• Strut : it is compression member of truss
• Column: it is compression member of buildings
• Stanchion: it is a built-up column with heavy
loads.
• Post: this term indicate compression member of
wooden structure.
• Boom: compression member of crane
3. • Common section used as Compression members
member
Single & Double Angles
Channel I-Section
(Joist / Beam)
Rod
Composite section
Tube Section
Hollow Section
4. • Modes of failure of Compression member
Crushing failure Buckling failure
5. Terms used in design of compression member
• Effective length (KL)
• Slenderness Ratio (𝜆𝑒𝑓𝑓)
• Economical Cross section
6. • Effective
length of
Column
(KL):
• The effective
length, KL, is
calculated from
the actual length
(L) of the
member,
considering the
rotational and
relative
translational
boundary
conditions at the
ends
9. Limit State Design Concepts
• Design compressive strength of a member or section (Pd) for MS
Flat
• Pd = Ae × fcd {Cl. 7.1.1 pg34}
Ae = Effective sectional area
fcd = Design stress in axial compression
15. • Length = 6m
• ISHB 350 @661.2 N/m
• Cover plate 350x20mm
• The lower end of
column is restrained
against rotation and
translation upper end is
hinged.
• Calculate design
compressive strength
