Value of composite metal beams?

In summary, bolting together two natural wood beams or joists over a 12' span can significantly increase strength compared to having them simply lying side by side. This phenomenon may not transfer as strongly to metal members due to their different nature, but fastening can still provide some additional strength. However, the strength gained may not be as significant as in wood, and for full strength connections, welding would be recommended over bolting. Additional factors such as bolt size and hole location should also be considered when determining the strength of the connection.
  • #1
RLewis42
4
0
It has been my understanding when working with natural wood beams/joists, that for example, two 2x12 members over a 12' span gain significant strength when they are fastened (nailed, glued or both) together rather than just lying side by side touching one another.

Is this phenomenon transferable to metal members or does it just work because of the random nature of wood fibers?

For example, if I have two 12' 1"x3" 1/8"wall rectangular tube 6063 aluminum joists suspended on each end, does the act of bolting them together with three 3/8" bolts at the 3' 6' and 9' locations add significant strength even though the 3/8" holes in the 3" vertical walls could conceivably weaken the joist somewhat? The two joist are already bolted together at both ends.

I am not looking to calculate the exact difference, just wanted to know if the concept transfers to metal.

thanks for your ideas,
 
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  • #2
Metal gains a bit of strength in all directions with fastening, but not as much as wood.
 
  • #3
RLewis42 said:
It has been my understanding when working with natural wood beams/joists, that for example, two 2x12 members over a 12' span gain significant strength when they are fastened (nailed, glued or both) together rather than just lying side by side touching one another.

Is this phenomenon transferable to metal members or does it just work because of the random nature of wood fibers?

For example, if I have two 12' 1"x3" 1/8"wall rectangular tube 6063 aluminum joists suspended on each end, does the act of bolting them together with three 3/8" bolts at the 3' 6' and 9' locations add significant strength even though the 3/8" holes in the 3" vertical walls could conceivably weaken the joist somewhat? The two joist are already bolted together at both ends.

I am not looking to calculate the exact difference, just wanted to know if the concept transfers to metal.

thanks for your ideas,
You'd have to check the loads in the bolts and the holes in the walls of the tubes to figure out how much stronger two beams bolted together would be. Three bolts over a 12-foot length seems a tad light.

For full strength connections, welding would normally be recommended.
 

Related to Value of composite metal beams?

1. What are composite metal beams and how are they different from traditional beams?

Composite metal beams are structural members used in construction that are made up of two or more materials, typically steel and concrete. Unlike traditional beams, which are typically made of a single material, composite metal beams have a combination of materials that work together to provide increased strength and stiffness.

2. What are the benefits of using composite metal beams?

There are several benefits to using composite metal beams, including increased strength, stiffness, and durability. They are also more cost-effective and require less maintenance compared to traditional beams. Additionally, composite metal beams can be designed to be lighter, allowing for more flexibility in building design.

3. How do composite metal beams affect construction costs?

While the initial cost of composite metal beams may be higher than traditional beams, they can actually save money in the long run due to their durability and reduced maintenance needs. They can also save on construction costs by allowing for longer spans and reducing the need for additional support columns.

4. Are there any limitations to using composite metal beams?

While composite metal beams have many advantages, they do have some limitations. They may not be suitable for certain applications, such as high-temperature environments, and they may require specialized equipment and expertise for installation.

5. How do composite metal beams contribute to sustainable building practices?

Composite metal beams can contribute to sustainable building practices in several ways. They are often made from recycled materials, reducing the environmental impact of production. They also have a longer lifespan and require less maintenance, reducing the need for replacement and waste. Additionally, their increased strength and lighter weight can lead to more efficient use of materials in construction.

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