Analytical study of concrete- lled e ect on the seismic behavior of restrained beam-column steel joints

Since placing continuity plates in panel zones of columns is dicult, including too much cutting and welding in connection areas, it also reduces the reliability of the connection. So, the continuity plates are removed from inside the column and replaced with internal elements such as horizontal reinforcement networks and external elements such as Trapezoidal stieners. In this study, through nite element modeling and geometricmaterial nonlinear analysis, under pushover and cyclic loading, we investigate loading. Results show that beam to box-column connections, with and without being in-lled with concrete, with arrangement stieners using concrete in the model with continuity plates, cause an increase of 0.12 percent in restraint, 4.98 percent in ductility and 96.92 percent in nal resistance. Moreover, in the proposed model, the use of concrete leads to an increase of about 2 percent in restraint, and 52.51 percent in resistance, while ductility connection formation was reduced. Also, all parameters have shown a signicant increase with binding reinforcement by horizontal reinforcement networks. Therefore, in the present study, the new proposed connection has satised all seismic parameters., which shows that it is a good alternative for continuity plates which are inside the column.