Types of Columns

Column is a vertical structural member that carry loads mainly in compression. They transfer the loads from slab, beam to the foundation safely.

There are several types of columns which are used in different parts of structures.

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Types of Columns in Building Construction

Columns are categorized based on following conditions

  1. Types of reinforcement
  2. Slenderness ratio
  3. Load Position
  4. Shape
  5. Construction material

1- Based on Types of Reinforcement

a- Tied Column

In this type of column, Longitudinal reinforcement are confined within closely spaced tie reinforcement. This type of column accounts 95% of columns used in building construction.

Column Design

b- Spiral Reinforcement

In this type, longitudinal bars are confined within closely spaced and continuously wound spiral reinforcement. This type of reinforcement provides extra confinement to concrete and delays in column failure.

Column Design

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Based on Slenderness Ratio

a- Short Columns

If the ratio effective length of the column to the least lateral dimension is less than 12, the column is called as the short column. A short column fails by crushing (pure compression failure).

Difference Between Short Column and Long Column | What Is Column ...

b- Long Column

If the ratio effective length of the column to the least lateral dimension exceeds 12, it is called as long column. A long column fails by bending or buckling.

Based on Load Position

a- Axially Loaded Column

These types of columns fails in pure compression at ultimate load. But this is very rare case as it is difficult to apply load exact at center of gravity of column.Interior column of multi-storey buildings with symmetrical loads from floor slabs from all sides is an example of this type of column.

b- Eccentric Load Column

In this type of column, the load acts either on X or Y axis (Uni-axial load column) or neither on any axis (Bi-axial loaded column). Edge column and corner column are best example of it.

How to Calculate Steel Weight by Formula?

In construction field, steel formulas are commonly used to calculate steel quantity for estimation and also for billing purposes. So, it is important for all civil engineers specially quantity surveyors to know how to calculate steel weight by formulas?

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What is Caisson Foundation?

What is Caisson Foundation?

Caisson are the structures that made up of wood, steel or reinforced concrete built above the ground level and then sunken into the ground.

Caisson foundation is most often used in the construction of bridge piers & other structures that require foundation beneath rivers & other bodies of water. This is because caissons can be floated to the job site and sunk into place.
There are several types of caisson foundation.
* Box Caissons
* Excavated Caissons
* Floating Caissons
* Open Caissons
* Pneumatic Caissons
* Compressed Air Caissons
* Monolithic Caissons
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What is Plinth Beam?

Plinth is the beam constructed at plinth level to take the load of masonry wall and protect it from cracks. It devides the load of wall to the foundations evenly.
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What is the diff between bridge and culvert?

A culvert is a small structure of span less than 6m constructed over small water channels or obstructions to provide the transportation route.
While, bridge is a large structure that is constructed above river, lake or road or railway to provide the transportation route. A bridge span can between 6m to 120m.

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At ultimate stage, why NA moves upward in concrete beam?

Why N.A. moves upward at ultimate stage in concrete beam?

Today, i started the series of questions ans answers related to design of concrete structures. I hope, you will enjoy these videos.
Following questions are included in this video
1- What is the min nos of steel bars provided in rectangular, circular and octagonal columns and what is the min diameter of steel bars should be used for columns?
2- How piles transfers the load to the soil and what are the types of it?
3- What assumption are taken for retained earth during the design of retaining wall?
4- What is drop panel and why it is provided?
5- What is the purpose of shear reinforcement in concrete beam and why it is provided?
6- For design purpose, how the depth and width of concrete beam is assumed?
7- What are the difference between under-reinforced beam, balanced beam and over reinforced beam?
8- At what section of concrete beam, chances of shear failure is dominant?
9- What is creep of concrete and what are the factors effecting the concrete creep?
10- Why thermal stresses produced in concrete and how they can be prevented?
11- What is the difference between singly reinforced beam and doubly reinforced beam?
12- Why neutral axis moves upward in concrete beam at ultimate stage?

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