The main difference between integrated systems and prefabricated systems is in their connections. systems
The prefabricated consists of prefabricated members that are connected at the execution site by joints
To be. Prefabricated connections can be categorized in several ways:
• In terms of how to provide continuity between prefabricated parts
In this regard, the joints are divided into two categories: wet and dry:
More connections
In this type of joints, after putting the prefabricated parts together, their distance is filled with concrete and the connection
Is established. This is sometimes done by overlapping the rebars and then concreting them in place on the beam or column
Or the connection source is supplied and the goal is to bring the connection behavior closer to the in-situ connection and proper operation
Wet seismic connection.
Dry fittings
In this transmission, the force is done by welding or screwing the buried members and provides continuity.
The behavior of these joints against seismic loads is not very reliable.
• In terms of the degree of entrapment
In this respect, the connections of prefabricated structures can be divided into three categories
Rigid connection
This type of connection is used to withstand vertical and lateral loads on the frames and can force
Transmit shear, flexural anchor and axial force. In this connection, the amount of rotation of the beam and the column together
Equal to.
Semi-trapped connection
Semi-clamped joints are similar to clamped joints, except that the size of the transmission anchor is reduced
And the period of the beam and the column at the junction are not equal. In some of these connections some elements
Connection components such as traction reinforcement or patches and tension braces after flowing
Tears and detachments become sudden and can no longer be loaded, and such behaviors cause a decrease
The ductility of these connections.
Simple connection
Simple joints do not show much resistance to beam rotation and only shear and axial force
Transfer. Frames in which these connections are used only transfer gravitational loads
they give.

• In terms of structural performance status
Strong connection

In this type of connection, due to the strong tools, the connection is stronger than the beam and in case of applying additional load
The rupture occurs outside the joint area and the joint remains elastic. In other words detailed
Plastic forms outside the joint.
Ductile connection
In this type of connection, unlike strong connection, rupture and energy absorption occur in the joint area and the joint
Plastic forms in the joint area. To design connections of this type can be used
Specific details increased the energy absorption capacity of the joint.
Generally, the mentioned houses are in several forms of prefabricated concrete, metal, wooden and  buildings.
There are, each with its own advantages and disadvantages, based on spatial requirements and conditions
The geography of each country is different.
In general, several issues lead to the increasing use of prefabricated buildings, which are:
Prefabricated villa building
1. Accelerate implementation
2. Accurate and adequate monitoring
3. Very suitable insulation
.4 Earthquake
Prefabricated buildings are one of the latest new products to expand residential units
Which can meet the management needs to balance the population. The industry is so advanced
Which not only provides the required comfort at the standard level, but also has been able to other home construction industries