Building Technology Study Guide Columns

What type of compression acts on columns

Columns act in axial compression

What affects the behavior of a column

The slenderness affects the behavior of a column

How do short columns fail

By crushing

How do tall columns fail 

By buckiling 

What are bamboo columns good for

Cheap

lightweight

strong

ideal for temporary structures such as scaffolding

What happens with the load on the column reaches the critical bucking load?

The member changes into a state of neutral equilibrium and the column will not spring back into shape

what happens when the load on the column is increased beyond the critical bucking load

The member changes into a state of unstable equilibrium and will continue to deform under a constant load until it snaps

Define Eccentric and what does it produce

load is applied at same distance form center, this produces bending moment

what happens if the load is applied within the middle third of the compression member

little bending moment is produced and the axial compression counteracts the tension produced by the eccentric load

What happens if the load is applied outside the middle third of the compression member 

Tension will occur 

What three factors affect stiffness

-Geometry of cross section (moment of inertia I)

-Material (modulus of elasticity E)

_Length (effective length depends on end conditions L)

define bracing

Restraining the column against lateral buckling at various points along its length