The goal of this study is to look into a new low-cost connection that can be readily established on the site.Similarly, to improve the efficiency of the connections and investigate the various variables that influence their capacity.Several studies focused on the behavior of these connections under various types of loads, which led to the discovery of their weak points, the ideal strength method for these connections under various loads, the best method of erection, as well as the cost and the time of construction.In the research's experimental part, a vertical force was applied to three types of connections between a circular column and end-plate.The connection was strengthened by filling the column with concrete and welding two circular bars in the tension and compression zones.The tested connections were analyzed using a computer program in the numerical analysis section (ANSYS 16).Finite element results were validated with experimental results.The parametric study of six extended end-plate connections separated into two groups under the effect of shearing force.The use of two internal circular bars at the tension and compression zones and the filling of the column with concrete are the main parameters that are considered in the study.