Box system
In this prefabricated system, the structural members are made up of hollow rectangular cubic pieces, each
They can form a whole or part of a separate unit. Due to the low number of connections in this method
Construction, the speed of implementation of this type of system is very high and suitable for building temporary structures with height
It is small and there is a possibility of reusing the parts. It should be noted that the weight and dimensions of the parts are very large
The main problem is this system.
Bearing wall system
In this system, the structure consists of prefabricated plates and walls of a structure that at the points of collision,
The parts are connected to each other with special arrangements. This method can be used to build structures
Used medium-height seismic resistance. Construction speed in this method due to the small number of connections,
It is tall, but most members are large in size and weight. This method of construction is due to the use of elements
Large dimensions have little flexibility in architectural issues and need to be designed
Note the architectural points.
Skeletal structural system
Structures with skeletal bearing system consist of frames consisting of beams and columns. connections
Prefabricated members in this method of construction may be articulated or clamped if used
From joint joints, it is necessary to consider the bearing system to withstand lateral loads. this system
It is divided into the following groups:
Skeletal structures with integrated columns
In this category of prefabricated structures, the columns are integrated and the beams depending on the length of the opening and
Connection types are made. The connection of beams to columns in this type of structures can be rigid or articulated.
In the articulated connection, the beams are placed on the floor or the seats installed on the column are level with the floor.
And in rigid connection, it is better to use the lambda method.
Skeletal structures with separate columns
In this system, the height of the columns is one or two floors and therefore the total height of the structure is column-column connections
There is. These joints can be articulated or rigid, which is a must when using a joint
Provide lateral loading of the structure through another system. Other members used in this method
Construction is the same as prefabricated structures with integrated columns. Dimensions and weight of prefabricated members to work
In this method, there is not much difference between them and as a result, transportation of parts is easily possible
Is. This system is suitable for building structures with a height of 10 to 60 meters. Small parts size and
As a result, the number of members used in the structure makes skeletal structures with separate columns in terms of
Execution has low speed, cost and manpower more than a system similar to an integrated column.
Portal frame skeletal structures
In this system, prefabricated members are used in the form of L, T, H and.. Due to the small number
Components and thus reduce the number of connections, this method of construction for the execution of buildings shorter than two
The previous system is superior. Connections in the direction of the portal members are often rigid and in the direction
It can be stiff or articular. It is recommended to use hinged connections from the system
Use side bearings in that direction. Due to the use of frame-shaped members that are able to withstand
There are side loads, this construction system alone has side loads in the direction of the portal members and
On the other hand, depending on the operating system and connections, it may or may not have a side load.
The role of joints in the behavior of prefabricated structures
Despite the many benefits of using the prefabricated industry in the design and construction of buildings;
Joints between prefabricated parts are of great importance in the performance of this type of structures, especially under load
They play a side role and this is especially important in areas with high seismicity.
The behavior of prefabricated joints in terms of strength and ductility should be similar to member joints in structures
Be concrete or even better than them.
Design from the point of view of resistance
The connection between the prefabricated members must be designed in such a way that the power transmission between the members is in the form
It is desirable to be possible. Today, the design of structures (prefabricated and in situ) is done in such a way that
Show strong nonlinear response under severe earthquakes. In other words, the connection must be designed that way
Be able to transfer force between structural members under fully controlled conditions.
Design from the point of view of ductility
Ductility in a structure indicates that the nonlinear regions of the structure have the ability to enter the plastic region and
They can tolerate larger deformations than yield deformations. At the same time other parts of the structure
They have sufficient strength to withstand the forces applied in the plastic areas