Numerical study of the behavior of side connections with side plate in composite steel and concrete frames

One of the most important components in steel structures is their joints. It is a matter of correct design of steel members, especially fittings. Since the beam flange is not connected to the column flange in the side plate connection system, all the vulnerabilities and uncertainties of the brittle behavior of conventional joints that in the full penetration welding behavior of the beam flange to the column wing are eliminated. Today, the use of composite sections filled with concrete has been widely considered in many structures. One of the steel joints that has been proposed in the past years is the use of side plates, which to some extent guarantees the linear behavior of the connection spring. In this research, the behavior of side joints with side panels in composite steel and concrete frames has been investigated. Thus, after ensuring the modeling process by validating a steel connection in Abacus software, a U-shaped steel beam composed of a CFT column with a side plate is modeled and parameters has been investigated.The effects of compressive strength of concrete were also investigated. The results showed that except for the diameter of the screws, other factors affect the strength, hardness and ductility . Increasing the width of the plate has increased the strength, stiffness, ductility and energy absorption. By decreasing the d / t ratio of the column, the strength, stiffness and energy absorption are increased and the ductility is reduced. As the compressive strength of concrete increases, the amount of strength, stiffness, ductility and energy absorption increases. The arrangement of the screws, the diameter of the screws, the d / t ratio of the beam and the addition of the thickness of the side plate do not have much effect on the strength, stiffness and ductility and energy absorption of the joint.