About CFSS & LSF

In this section, we are going to describe LSF structures:

“Familiarity and understanding of the performance of the construction system of chilled steel frames”

These types of structures show very good performance in terms of structural behavior. To understand more deeply the performance of this type of structure, it is not bad to first describe the performance of hot-rolled steel structures and then examine the performance of this type of structure.

Now we are going to explain the operation of these two types of systems with a simple example:

If we consider a two-story building consisting of cube-shaped rooms, if we use a hot-rolled steel skeletal system to build this building, we will have to use four relatively strong columns in the four corners of the rooms of this building, which are supported by vertical beams. They are connected to each other, which together form a two-tiered and interconnected steel frame.

In this system, the weight of the floors is transferred to the beams around the roof and the beams bend the force to the surrounding four pillars so that the load transfer path to the foundation and then the ground is completed. The walls in this type of system do not have a load-bearing role at all and will add to the load of the structure and are used only as a partition. It should be noted that the weight of the walls is transferred to the columns by the beam or the lower roof, and if there is no beam under the walls, only the load is transferred to the surrounding beams and finally to the columns through the function of the roof beams.

Now, if we want to use the Cold Formed Steel Structure system to build this simple building, we have to completely change our philosophy of thinking. In this type of system, the first question we have to answer. The location of the walls. In the above example, we will have a wall on all four sides. So instead of using only four columns, which allows us to transfer all the weight of the roof and walls to the ground through the main beams. Inside the walls, modularly, every 60 cm to 60 cm, we install a column. Four columns, in this system, the force is transmitted to, for example, 0 to 4 columns. As a result, the load-bearing capacity of each column is drastically reduced, in other words, each wall consists of a metal frame with a large number of columns, which is created by other orthogonal frames in the walls perpendicular to it, creating a complete three-dimensional system. 

The steel consumption coefficient in this system, despite the large number of columns and structural elements, is much lower than hot-rolled steel structures, which leads to the economics of the project. In this type of system, the amount of steel consumed is between 27 and 35 kg per square meter. While in the hot rolling steel skeletal system, this amount is between 75-120 kg per square meter.

One of the important advantages of cold formed steel structures is a very high degree of uncertainty, which leads to a very good stability of this complex. While in hot rolling steel, the destruction of one of the columns can even lead to the destruction of the entire system. While in this system, due to the high number of columns, if some of them are destroyed, there is a possibility of load transfer by other columns.

The design and operation mechanism of this type of system is similar to timber structures (Timber Structure) and in countries such as the United States, which due to the large number of renewable forests, there is a lot of suitable wood for the structure of this type of structures due to economic efficiency as a system. Common construction of short and medium buildings is used. The use of Cold Formed Steel Structure is the best choice for low and medium rise buildings.This manufacturing technology replaces traditional manufacturing methods with common mistakes.