welcome to our presentation on column
TRANSCRIPT
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WELCOME TO PRESENTATION ON
COLUMN(STEEL STRUCTURE)
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UTTARA UNIVERSITYDEPARTMENT OF CIVIL & ENVIRONMENTAL
ENGINEERING
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WHAT IS COLUMN?Column is a vertical structural member. It transmits the load from ceiling/roof slab and beam, including its self-weight to the foundation. Columns may be subjected to a pure compressive load. Steel columns are the most widely used now-a-days.
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Types of ColumnLong Column or SlenderShort ColumnIntermediate Column
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Steel ColumnStandard Structural Steel Sections
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Build-up Column Sections
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ADVANTAGES OF STEEL COLUMN
High Strength : This means that the weight of column that made of steel will be small.
Uniformity: Properties of steel do not change in any portion of Column.
Elasticity : Steel follows Hook’s Law very accurately.
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ADVANTAGES OF STEEL COLUMN
Ductility : Steel can withstand extensive deformation without failure under high tensile stresses
Toughness : Steel has both strength and ductility
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DISADVANTAGE OF STEEL COLUMN
The use of steel columns is very economical because of their high strength and slenderness of a compressive column is increased, its danger of buckling increases
The strength of structural steel member can be reduced if this member is subjected to cyclic loading.
Under certain conditions steel may lose its ductility , and brittle fracture may occur at places of stress concentration.
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DESIGN METHOD
ASD=Allowable Strength Design LRFD=Load Resistance Factored Design.
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Load CombinationFor ASD 1D+1L 0.75D+0.75L+0.75W 0.75D+0.75L+0.75EFor LRFD 1.4D 1.2D+1.6L+0.5Lr 1.2D+1.6Lr+(0.5L or 0.8W) 1.2D+1.3W+0.5L + 0.5Lr 1.2D±1E+0.5L 0.9D±(1.3W or 1E)
D=Dead Load, L=Live Load,W=Wind Load, E=Earthquake LoadLr=Roof Live Load
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The basic requirements for compression members are covered in Chapter E of the AISC Steel Manual. The basic form of the relationship is
Pu cPn = c(AgFcr)where c is the resistance factor for
compression members (=0.9) and Fcr is the critical buckling stress (inelastic or elastic) and Fe is the elastic buckling stress
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The nominal strength Pn of rolled compression members (AISC-E3) is given by
Pn = AgFcrFor inelastic columns or
For elastic columns or
Q =1 for majority of rolled H-shaped section (Standard W, S, and M shapes); Others are covered later
yQFE
rKL 71.4 ye QFF 44.0
yQFE
rKL 71.4
yFQF
cr QFF ey /658.0
ye QFF 44.0
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Code Requirements ASD Formula
CcrKL
rKL
rKLE
CcrKL
Ccr
KL
Ccr
KL
CcFy
Fa
rKL
22
2
3
2
149000
23
12
81
83
35
211
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Construction process
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Detailing
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THANK YOU