Imposed loads also known as live loads are usually things that can change, such as people or furniture. In the calculations all the imposed loads are multiplied by this safety factor to ensure a safe design. Permanent loads also known as dead loads are usually things that do not change, such as the weight of the floor or a wall. In the calculations all the permanent loads are multiplied by this safety factor to ensure a safe design. Recommended C1 value is 1. This is the most conservative, safe value and is recommended for general use.
The distribution of bending moments along the length of the beam affects it buckling capacity, C1 is a factor for the shape of the bending moment between points of lateral restraint, for a beam with only uniformly distributed loads along its full length C1 can be taken as 1.
A Deflection Limit is the maximum amount you allow the beam to sag. You can set a limit for how much it can sag under Variable Loads — usually things that can change, such as people or furniture — and under Permanent Loads, such as the weight of the floor or a wall.
Our Calculator defaults to the recommended limits, but you may need to change these. For example, if you are using the beam to span above bi-fold doors you may need to set a lower limit, or if the beam is going to be used as a structural ridge beam the variable load deflection should not normally exceed 10mm. If you are using the auto select feature, you will be shown a list of all the steel beam sizes that are suitable for your requirements.
You first need a structural engineer to design and size the steels etc, all info to be shown to building control, who will need to come out to make sure every thing complies with building regs. That someone who told you its to do with the size of the joists is given you false info. The wall is a load bearing one the house is old victorian pre We believe the wall to be a Beam for load baring wall is cladded to look like old Hi all. Most of the work can be carried out by an experienced local builder, but you will also need a structural engineer and possibly an electrician and a plumber, depending on the location of the RSJ.
Most people handle the final decorating work themselves but some will also need the services of a painter and decorator. The labour costs for installing an RSJ depend on the size of the job at hand. You can purchase an RSJ as supply only, however, it is not recommended that you take on the job of installing the RSJ by yourself. The calculations involved with installing an RSJ are complex and only a professional can provide the appropriate calculations on how much weight can be distributed across your RSJ.
The table below indicates the supply only costs for different elements you may need for an RSJ job. There are a number of additional costs that may come up during an RSJ installation job. The main additional costs that may pop up with this type of work are listed below:. There are several factors that may affect the cost of your RSJ installation cost. This can include the size of the RSJ, the location of your home, ease of access to your property, and whether utilities need to be moved.
The size of the RSJ can affect the installation. The bigger the RSJ beams, the more the total job is going to cost. The location of your home can affect the cost of an RSJ installation. The ease of access to your property can affect the cost of and RSJ installation. If your property is difficult to access, the installation will take a lot longer to complete than if your property is easy to access.
This will result in the overall cost of the job being higher due to the additional labour costs and the extra complexity of the job.
If utilities need to be moved in order to install the RSJ, you may need to think about the additional costs of hiring a plumber or an electrician. It takes a lot of specific calculations and a lot of very specifically skilled work to complete. With that in mind, the following list explains the steps that are involved with having an RSJ installed:.
There are a number of benefits to installing an RSJ. The main advantages of installing an RSJ are listed below:. Steel is well-known for being eco-friendly. That is why steel is used for a lot of building projects.
There are no limits on the number of times that RSJ beams can be recycled. This means that there is a lot less waste than if other materials were to be used instead. Steel RSJ beams are extremely cost-effective in comparison to other materials, such as wood and concrete. Steel is incredibly strong. It is capable of bearing more weight and stress without compromise than a beam made out of alternative materials, such as concrete or wood.
Modern buildings are often constructed with steel frameworks because they are incredibly strong and able to withstand extreme weather conditions, such as earthquakes and hurricanes.
RSJ steel beams are incredibly durable. Wood and concrete beams are nowhere near as tough in composition as steel. Steel can last for an incredibly long time, especially in comparison to other materials. The load-bearing design of RSJ steel beams means that they are basically indestructible to constant weight. There is a wide range of different RSJ beams available. The following list explains a little bit about each of the different types and the pros and cons of each.
Universal beams are good for many different types of construction. If the beam is steel then it should normally be protected against fire so that it will have 30 minutes resistance to fire if measured in a standard test.
There are different ways that this may be achieved, but most common is the use of two or more layers of properly fixed plasterboard - the thickness of which will depend on the manufacturer's specification. If an exposed timber beam is preferred then a calculation is generally required to demonstrate how much inherent fire resistance it has - dependent on it's size and species of timber.
A concrete beam, which would normally have steel reinforcement inside it, would generally has adequate fire resistance properties, providing the steel inside is adequately covered by the concrete.
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