All About Column size for 20m span and Column design

All About Column size for 20m span and Column design

Designing and constructing a building involves intricate planning and attention to detail, especially when it comes to the size and design of columns. As one of the primary structural elements, columns play a crucial role in supporting the weight of a building and distributing it evenly to the foundation. In this article, we will delve into the key aspects of column sizing for a 20m span and the essentials of column design. From load calculations to material selection and construction techniques, we will explore the important considerations to keep in mind when designing columns for a safe and efficient building structure. Whether you are a novice in the field of architecture or a seasoned engineer, this article will provide valuable insights on all things related to column size and design.

Column size for 20m span and Column design Thumb rule

Column size for 20m span and Column design Thumb rule

When it comes to designing columns for a 20m span, there are some important factors that must be considered. These include the vertical and horizontal loads that the column will be subjected to, as well as the type of material used for construction.

One important aspect to consider when determining the size of a column is the expected load it will bear. In general, the larger the span, the larger the load that the column must support. For a 20m span, the column will likely be subjected to significant bending and compression forces, making it important to choose a suitable size to ensure its stability and safety.

In terms of thumb rules, some experts suggest that for a 20m span, the column size should be at least 1/20th of the span. This means that for a 20m span, the minimum column size would be 1m in any dimension (square, rectangular, or circular). However, this is just a general rule and may vary based on the specific design and structural requirements of the project.

Apart from the overall size, it is also crucial to design the column in a way that it can resist the expected loads and forces. This involves determining the appropriate amount of reinforcement and the spacing and arrangement of the bars within the column. The column design should consider both axial and bending loads, as well as any eccentricities or irregularities in the loading.

Reinforced concrete is a commonly used material for column construction due to its strength and durability. Depending on the specific project requirements, other materials such as steel or timber may also be suitable for use in column design.

In conclusion, the size of the column for a 20m span can be determined based on the expected load and should be designed in a way that it can withstand the forces acting upon it. Following the recommended thumb rule of 1/20th of the span is a good starting point, but it is crucial to consider other design factors and consult with structural engineers to ensure a safe and effective column design.


In conclusion, column size and design for a 20m span plays a crucial role in the structural integrity and overall stability of a building. It is important to consider various factors such as load bearing capacity, material strength, and structural efficiency when determining the appropriate column size and design. By following proper design guidelines and standards, we can ensure that the columns are able to withstand the imposed loads and provide a safe and reliable structure. Proper maintenance and regular inspections are also essential to ensure the longevity of the columns. It is always recommended to consult with a structural engineer for accurate calculations and to ensure the safety of the building. By taking the necessary precautions and considerations, we can create strong and durable columns that will support our structures for years to come.


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