# All About Steel beam size for 3m, 4m, 5m, 6m, 7m, 8m & 10m span

Steel beams are an essential element in construction, providing stability and strength to a structure. Choosing the right steel beam size is crucial in ensuring the integrity and safety of a building. With varying span lengths such as 3m, 4m, 5m, 6m, 7m, 8m, and 10m, it can be confusing to determine the appropriate size for a steel beam. In this article, we will dive into all the essential details about steel beam sizes for different span lengths, including the factors to consider and the most common sizes used in construction. Whether you are a contractor, engineer, or homeowner, this article will provide valuable insights into all you need to know about steel beam sizing for various span

## Steel beam size for 3m, 4m, 5m, 6m, 7m, 8m & 10m span

Steel beams are a commonly used structural element in the construction of buildings, bridges, and other structures. They are designed to support heavy loads and provide stability to the overall structure. When it comes to determining the size of steel beams for a specific span, several factors need to be taken into consideration, such as the type of loading, building codes, and the material properties of the beam.

For spans of 3m, 4m, 5m, 6m, 7m, 8m, and 10m, steel beams are often selected based on their moment of inertia and their section modulus. These two properties indicate the beam’s resistance to bending and its ability to resist stresses.

For a 3m span, a W150x13 beam is commonly used. This type of beam has a moment of inertia of 75.4 cm^4 and a section modulus of 20.4 cm^3. It can support a maximum uniformly distributed load of approximately 2.2 kN/m.

For a 4m span, a W200x11 beam is typically selected. This beam has a moment of inertia of 219.9 cm^4 and a section modulus of 36.6 cm^3. It can support a maximum uniformly distributed load of around 3.0 kN/m.

For a 5m span, a W250x22 beam is commonly used. This beam has a moment of inertia of 715.5 cm^4 and a section modulus of 68.9 cm^3. It can support a maximum uniformly distributed load of approximately 4.3 kN/m.

A 6m span will require a larger beam, such as a W310x21, which has a moment of inertia of 1,765.8 cm^4 and a section modulus of 107.8 cm^3. This beam can support a maximum uniformly distributed load of around 6.9 kN/m.

For a 7m span, a W350x33 beam is typically used. With a moment of inertia of 3,474.0 cm^4 and a section modulus of 153.6 cm^3, this beam can support a maximum uniformly distributed load of approximately 9.2 kN/m.

A span of 8m will require a W410x38 beam, which has a moment of inertia of 6,651.7 cm^4 and a section modulus of 215.1 cm^3. It can support a maximum uniformly distributed load of around 12.0 kN/m.

Finally, for a 10m span, a W530x66 beam is commonly used. With a moment of inertia of 19,156.0 cm^4 and a section modulus of 328.2 cm^3, this beam can support a maximum uniformly distributed load of approximately 18.0 kN/m.

It’s important to note that these are only general guidelines and the actual size of the beam needed for a specific project will depend on several other factors. These include the type of structure, the building codes, the type of loading, the spacing of the beams, and the material properties of the beam.

In conclusion, the selection of steel beam size for a specific span is a crucial step in the design process and should be carefully evaluated by a qualified structural engineer to ensure the safety and stability of the structure.

## Steel beam span rule of thumb

The steel beam span rule of thumb is a widely used method for determining the minimum allowable span of a steel beam. It is a quick and simple calculation that can help engineers and designers make preliminary decisions about beam sizing and layout.

The rule of thumb is based on the assumption that a steel beam will deflect no more than 1/360th of its length under a full live load. This deflection limit is considered acceptable for most building applications, as it ensures structural stability and minimizes any visible movement or vibrations.

To use the rule of thumb, the engineer must first determine the live load and dead load of the structure. The live load is the weight of the people, furniture, and other moveable objects that the beam will support. The dead load is the weight of the structure itself, including the weight of the steel beam.

Next, the engineer must determine the load-bearing capacity of the steel beam, which is expressed in pounds per square foot (psf). This capacity varies depending on the type of steel and its dimensions.

Once these values are determined, the engineer can use the formula L = (5 x live load x beam length^4)/(384 x dead load x beam capacity) to calculate the maximum allowable span for the steel beam.

For example, if the beam is 8 feet long and has a live load of 50 psf and a dead load of 20 psf, and the load-bearing capacity of the steel is 50,000 psf, the maximum allowable span would be:

L = (5 x 50 psf x 8^4)/(384 x 20 psf x 50,000 psf) = 10 feet

Therefore, according to the rule of thumb, this steel beam could safely span a maximum distance of 10 feet.

It is important to note that the steel beam span rule of thumb is meant to be used as a quick and preliminary calculation. For more accurate and precise results, a thorough structural analysis must be performed, taking into account factors such as beam shape, bracing, and lateral support.

In addition, the rule of thumb assumes a relatively uniform distribution of weight along the beam and does not account for concentrated loads or dynamic loads. Therefore, it is best to use this guideline cautiously and to consult with a structural engineer for a detailed analysis before finalizing any beam designs.

In conclusion, the steel beam span rule of thumb is a useful tool in the initial design process and can provide a general guideline for beam sizing. However, it should not be solely relied upon and must be used in conjunction with other engineering principles to ensure the structural integrity and safety of a building.

## Steel beam or rsj size for 3m span

For a 3m span, the most commonly used steel beam or RSJ (rolled steel joist) size is 152 x 89 x 16 kg/m (also known as UB 152). This size is suitable for residential and light commercial construction where the load-bearing requirements are not too high.

The first number in this size, 152mm, refers to the height of the beam or RSJ. The second number, 89mm, represents the width of the flange (horizontal section) while the third number, 16 kg/m, is the weight of the beam per meter length. These dimensions are standard for all steel beams and are designated by the British Standards (BS 4).

The choice of steel beam size for a 3m span is determined by the load it is expected to carry. The load can be divided into two main categories – dead load (the weight of the structure itself and any permanent fixtures) and live load (the weight of occupants, furniture, and other temporary loads). The total load is then multiplied by a safety factor to determine the required section modulus for the beam. Section modulus is the measure of a beam’s ability to resist bending and is represented by the third number in the beam size, 16 kg/m in this case.

The UB 152 steel beam can support a maximum load of 960kg/m which is suitable for most residential applications. However, for heavier load requirements, a larger beam size, such as 203 x 102 x 23 kg/m (also known as UB 203), may be needed.

It is essential to consider the type of connections used to secure the steel beam in place. The connections must be able to transfer the load from the beam to the supporting structure without compromising its strength or stability. The type of connections used will also affect the choice of beam size.

In addition to the load requirements, other factors such as building codes, available space, and cost may also influence the selection of steel beam size for a 3m span. In cases where larger beams are not feasible or cost-prohibitive, alternative solutions can be considered, such as using multiple smaller beams or incorporating additional support elements such as columns or walls.

In conclusion, the standard steel beam or RSJ size for a 3m span is UB 152 (152 x 89 x 16 kg/m). However, the final choice of beam size should be determined by a thorough structural analysis taking into consideration the load requirements, connection details, and other relevant factors.

## Steel beam or rsj size for 4m span

When designing structures, one crucial element that engineers have to consider is the type and size of beams used to support the weight of the structure above. In particular, for a 4m span, it is important to select the appropriate steel beam or RSJ (Rolled Steel Joist) size to ensure the structural integrity and safety of the building.

The most commonly used steel beam for a 4m span is the Universal Beam (UB) or the Universal Column (UC). UBs and UCs are named according to their shape, with the UB having a wider flange and the UC having a narrower flange. UBs and UCs come in various sizes and are designated by their depth (in millimeters) and weight (in kilograms per meter).

For a 4m span, the optimal size for a UB would generally range from 152x89mm to 203x133mm, while for a UC, it would range from 152x152mm to 203x203mm. The final size chosen will ultimately depend on the specific loading requirements and structural design of the building.

To determine the appropriate size for a steel beam, engineers have to consider several factors such as the dead and live loads, the material of the beam (e.g. mild steel, high-strength steel), and the desired level of deflection (bending or flexing) of the beam.

For structures with heavier loading requirements, engineers may opt for a larger size of beam to ensure its strength and stability. On the other hand, for structures with lighter loads, a smaller beam size may be suitable. However, it is essential to strike a balance between the size of the beam and its load-bearing capacity to avoid overloading or underutilizing the beam.

In addition to the type and size of the beam, engineers also have to consider the spacing of the beams within the structure. For a 4m span, the ideal spacing between UBs or UCs would be approximately 1m to 1.2m, depending on the specific design and loading requirements.

In summary, when designing a structure with a 4m span, selecting the appropriate size of steel beam is crucial to ensure its stability, safety, and functionality. Engineers must carefully analyze and consider various factors to determine the correct beam size, ultimately resulting in a durable and robust structure.

## Steel beam or rsj size for 5m span

A steel beam, also known as a rolled steel joist (RSJ), is a vital component in the construction of buildings and other structures. It is a horizontal structural member that is designed to support loads and transfer them to the columns or walls of a building. In this article, we will discuss the steel beam or RSJ size for a 5m span.

The span of a beam refers to the distance between its supports, and is a crucial factor in determining the size and strength of the beam required for a specific project. When it comes to steel beams, the most common span lengths range from 4m to 12m, with a 5m span falling within this range.

The size of the steel beam needed for a 5m span will depend on several factors, including the type of load it will support, the material it is made of, and the type of support it will have. In general, the larger the span, the larger the beam will have to be to support the required loads.

When it comes to steel beams, the two main types used are I-beams and H-beams. I-beams, also known as ‘S-shaped’ or ‘W-shaped’ beams, are the most commonly used type of steel beam and are characterized by their distinctive shape. H-beams, also known as ‘I-shaped’ beams, are more commonly used in horizontal applications, such as bridges.

For a 5m span, the size of an I-beam typically ranges from 152x152mm to 203x152mm, depending on the load it needs to support. In comparison, an H-beam size for the same span length can vary from 152x152mm to 305x305mm, again depending on the load requirements.

In addition to the span length, the material used in the construction of the beam also plays a vital role in determining its size. Both I-beams and H-beams can be manufactured from different types of steel, such as mild steel or high-strength steel. The grade of steel used will have a direct impact on the size and load-bearing capacity of the beam.

Finally, the support conditions of the beam also play an essential role in determining its size. A beam can have different types of support, including simply supported, cantilever, and continuous. For a 5m span, a simply supported beam would require a larger size compared to a continuous beam, as it needs to support the load at just two points instead of multiple.

In conclusion, the size of a steel beam or RSJ for a 5m span will depend on several factors, including the type of beam, the material used, and the support conditions. It is essential to consult a structural engineer to determine the appropriate size and type of beam needed for a specific project.

## Steel beam or rsj size for 6m span

A steel beam or RSJ (rolled steel joist) is a common structural element used in civil engineering construction. Its primary function is to support heavy loads and resist bending forces, making it an essential component in the design of large structures such as buildings, bridges, and industrial facilities. When it comes to selecting the appropriate size of steel beam or RSJ for a particular project, there are several factors to consider, including span length, load capacity, and structural design requirements.

For a 6m span, the size of the steel beam or RSJ will depend on the load that it is expected to carry. It is essential to accurately estimate the weight of the material or equipment that will be supported by the beam, as well as any additional live loads such as people or furniture. The type of load also plays a significant role in determining the size of the beam, as the distribution of the load will affect the beam’s strength and stability.

The most commonly used steel beam sizes for a 6m span range from 152x152mm to 356x406mm, also known as UB (universal beam) and UC (universal column) sections. These sizes provide a wide range of load-bearing capacities and are readily available in the market. The thickness of the steel beam also plays a crucial role in its load-carrying capacity, with thicker beams being able to support higher loads.

In addition to the load capacity, the type of structure and its design requirements will also play a role in determining the size of the steel beam or RSJ. For example, a building with multiple floors and walls will require stronger and larger beams to support the vertical loads and transfer them to the foundation. Structural engineers will use mathematical calculations and computer-aided design (CAD) software to determine the most suitable size and type of beam for a specific structure.

Another factor to consider when selecting the size of a steel beam or RSJ is its connection to other structural elements. The beam’s ends must be adequately supported and connected to ensure the overall stability and integrity of the structure. This can be achieved through welding, bolting, or using steel connections designed for this purpose.

In conclusion, the appropriate size of a steel beam or RSJ for a 6m span will depend on various factors, such as load capacity, type of load, structural design requirements, and connection details. It is essential to consult with a professional structural engineer to accurately determine the most suitable size of the beam and ensure the safety and stability of the structure.

## Steel beam or rsj size for 7m span

When constructing a building or structure, selecting the appropriate steel beam or RSJ (Rolled Steel Joist) size for a given span is crucial in ensuring the structural stability and safety of the project. In this article, we will discuss the factors to consider when determining the steel beam size needed for a 7m span and discuss the different types of steel beams and their properties.

Factors to Consider

There are several factors that need to be considered when determining the appropriate steel beam size for a 7m span. These include the load requirements, the type of support structure, and the overall design of the building.

Load Requirements: The first and most important consideration is the load requirements of the structure. The beam size and type will vary depending on the type of load it needs to support. For example, a beam supporting a roof will have different load requirements compared to a beam supporting a floor.

Support Structure: The support structure of the building also plays a significant role in determining the beam size. Beams can be supported by different types of structures such as walls, columns, or other beams. The type of support will impact the strength and stability of the beam.

Design of the building: The design and layout of the building will also influence the choice of beam size. The spacing of the beams, as well as any openings or cutouts, will affect the load distribution and thus the beam size needed for a 7m span.

Types of Steel Beams

There are three main types of steel beams commonly used in construction: I-beams, H-beams, and S-beams.

I-Beams (or Universal Beams): These are the most commonly used steel beams due to their high strength-to-weight ratio. They are named after their cross-section, which resembles the letter “I”. I-beams are ideal for heavy load-bearing structures and can be supported by walls or other beams.

H-Beams (or Wide Flange Beams): These beams have a wider flange and are commonly used for larger spans. They offer more stability and can support heavier loads compared to I-beams.

S-Beams (or American Standard Beams): These beams have a narrower flange and are not as commonly used as I-beams or H-beams. They are suitable for light to medium loads and are usually used for shorter spans.

Selecting the Size for a 7m Span

For a 7m span, an H-beam or a wide flange beam would be the most suitable option. The exact size of the beam will depend on the factors mentioned above. However, as a general guide, a W150x22 beam (also known as an HN150x22 beam) would be suitable for supporting a roof with light to medium loads. If the beam is supporting a floor or heavy load, a larger beam such as a W200x39 or W200x46 would be required.

It is important to note that the beam size also depends on the spacing of the beams. For a 7m span, the spacing between the beams should not exceed 1.5m to ensure sufficient support and strength.

In conclusion, selecting the appropriate steel beam or RSJ size for a 7m span requires careful consideration of the load requirements, support structure, and design of the building. The type of beam and its size will ultimately depend on the specific requirements of the project. A structural engineer should always be consulted to determine the most suitable

## Steel beam or rsj size for 7.5m span

Steel beams, also known as RSJs (rolled steel joists), are a commonly used structural element in construction. They are designed to carry heavy loads over long spans and are ideal for supporting floor and roof structures in buildings.

For a 7.5m span, the size of the steel beam or RSJ that is required will depend on various factors such as the type of load it will be supporting, the building design, and the location of the beam within the structure. However, there are some general guidelines that can help determine the appropriate size for a 7.5m span.

One of the main considerations when selecting the size of a steel beam is its load-bearing capacity. This is determined by the section modulus, which is a measure of the beam’s ability to resist bending stresses. The higher the section modulus, the stronger the beam will be.

For a 7.5m span, a steel beam with a section modulus of at least 100 cm³ is generally recommended. This is based on a uniformly distributed load (UDL) of 1.5 kN/m and an ultimate limit state (ULS) design load of 5 kN/m.

In addition to the section modulus, the depth and width of the beam also play a crucial role in its load-bearing capacity. For a 7.5m span, a steel beam with a depth of at least 300 mm and a width of 150 mm is typically required.

Furthermore, the type of steel used for the beam is also important. Common types of steel used for beams include S355 or Grade 50 steel, which have high yield strength and are ideally suited for structural applications.

It is important to note that the size and type of the steel beam required for a 7.5m span may vary depending on the specific design and loading requirements of the project. Consulting with a structural engineer or using structural design software can help determine the most suitable size and type of steel beam for a particular project.

In conclusion, for a 7.5m span, a steel beam with a section modulus of at least 100 cm³, a depth of 300 mm, and a width of 150 mm, made of high-strength steel such as S355 or Grade 50, is generally recommended. However, always consult with a professional for accurate sizing and selection of steel beams for your specific project needs.

## Steel beam or rsj size for 8m span

A steel beam, also known as a rolled steel joist (RSJ), is a common structural component used in civil engineering for its high strength and durability. When designing a steel beam for an 8m span, several factors must be taken into consideration to ensure it can safely support the loads and maintain structural integrity.

The main considerations when selecting the size of a steel beam for an 8m span are the load it will be supporting, the material strength, and the type of connection being used. The most commonly used material for structural steel beams is mild steel, which has a high yield strength and ductility, making it suitable for a wide range of applications.

The type of connection used to join the steel beam to other structural components is also important, as it affects the structural behavior and capacity of the beam. There are four main types of connections: simple, semi-rigid, rigid, and moment-resisting. For an 8m span, a moment-resisting connection is recommended as it provides the highest level of support and load capacity. However, this type of connection requires a larger steel beam due to the increased forces involved.

Based on the above considerations, a steel beam for an 8m span would typically range from 152x152mm to 305x305mm. The size of the beam will depend on the specific project requirements and load calculations. The most common shapes for steel beams are I-shaped and H-shaped, with the I-shaped beam being more efficient for longer spans due to its higher area moment of inertia.

In conclusion, choosing the appropriate size of a steel beam for an 8m span is a crucial step in the design process to ensure the structural safety and stability of the project. Factors such as load, material strength, and connection type should be carefully considered to determine the most suitable beam size for the specific application. It is always recommended to consult with a professional engineer for accurate calculations and proper design of steel beams for civil engineering projects.

## Steel beam or rsj size for 9m span

Steel beams, also known as RSJ (rolled steel joists), are commonly used in construction for their strength and durability. When selecting a steel beam for a 9m span, there are several factors to consider such as load bearing capacity, deflection, and cost.

The first step in determining the appropriate size for a steel beam is to calculate the load bearing capacity required. This can be done by multiplying the weight of the structure (including materials, people, and furniture) by the required safety factor. The safety factor can vary depending on the type of building and its use, but it is typically between 1.5-2.5 for residential buildings and 3-4 for commercial buildings.

Once the load bearing capacity is determined, the next step is to determine the beam’s deflection. Deflection is the amount of bending or sagging a beam will experience when under load. It is important to keep deflection within acceptable limits to ensure the safety and stability of the structure. The deflection limit for residential buildings is typically 1/360th of the span, while for commercial buildings it is typically 1/240th of the span.

Based on the load bearing capacity and deflection criteria, the following are some commonly used steel beam sizes for a 9m span:

1. For light residential structures (single-family homes), a 152x152x37 UC or a 254x102x31 UB beam would be suitable.

2. For larger residential structures (multi-story buildings), a 254x146x31 UB or 203x133x25 UB beam can be used.

3. For commercial buildings, a 356x406x634 UB beam would be suitable for a 9m span.

It is important to note that these beam sizes are just examples and may vary depending on the specific design requirements of a project. In addition, the size of the beam may also vary depending on the material used for the construction and the type of support used for the beam.

In conclusion, when selecting a steel beam for a 9m span, it is important to consider load bearing capacity and deflection limits to ensure the safety and stability of the structure. Consulting with a structural engineer or a construction professional is recommended to determine the most appropriate and cost-effective size for the specific project.

## Steel beam or rsj size for 10m span

A steel beam or RSJ (Rolled Steel Joist) is a common structural element used in construction projects to support heavy loads over long spans. For a 10m span, several factors need to be considered when choosing the appropriate size of steel beam.

1. Load Capacity Requirements: The first consideration when choosing a steel beam size is the amount of load that it needs to support. A 10m span is a relatively long distance, and it will require a significant amount of strength to support the applied loads. The type of loads to be supported also plays a role in determining the size of the beam. For instance, if the beam will be supporting dead loads (the weight of the structure itself) and live loads (such as furniture or equipment), a larger beam will be needed compared to a beam that only supports dead loads.

2. Beam Configuration: The configuration of the beam also affects its load-carrying capacity. If the beam is supported on both ends, it can carry more load compared to a cantilever beam that is only supported on one end. Therefore, for a 10m span, a beam with both ends supported will require a smaller size compared to a cantilever beam of the same span.

3. Material: Steel beams are available in various grades and can be made from different materials, such as mild steel, high-strength steel, and structural steel. The material’s strength and stiffness will determine the size of the beam required to support the loads.

4. Impact of Deflection and Camber: Deflection refers to the bending of a beam under load, while camber is the slight upward curve added to a beam to counteract the effects of deflection. In a 10m span beam, deflection and camber must be taken into account to prevent excessive bending and ensure the beam remains level. If the beam is of a larger size, it will have a lower deflection, eliminating the need for additional camber.

5. Building Regulations: Building regulations require a minimum amount of safety factors to be applied when designing beams. These factors can vary depending on the type of building, its location, and use. For instance, a commercial building will have different safety factors compared to a residential home.

Based on all these factors, a 10m span steel beam will typically range from 203x133x25UB (Universal Beam) to 406x178x54UB for standard residential or commercial buildings. For more significant structures such as warehouses or industrial buildings, larger beam sizes, such as 610x101x32UB or 914x419x343UC, may be required.

In conclusion, the size of a steel beam for a 10m span will depend on the load requirements, beam configuration, material, deflection, and building regulations. Consulting with a structural engineer is recommended to determine the appropriate beam size for a specific project.

## Conclusion

In conclusion, the selection of steel beam sizes for various spans is a crucial factor that should be carefully considered in any construction project. The span length, desired load capacity, and the type of structure all play a significant role in determining the appropriate size of steel beams. By following the guidelines mentioned in this article, one can make an informed decision on the ideal beam size for spans of 3m, 4m, 5m, 6m, 7m, 8m, and 10m. It is essential to consult with a structural engineer and use accurate calculations to ensure the safety and stability of the structure. With the right steel beam size, you can ensure a strong and durable construction that meets your specific requirements.