The beam–column connection is the main element in frame structures. It is particularly vulnerable to cyclic lateral loads such as earthquakes. The main reason for this is the occurrence of shear forces. The main components of this force are the forces that are transmitted from the beam to the column. A good knowledge of these forces will allow for the safe and accurate dimensioning of frame joints. In current codes of differently countries, as well as in Eurocode, beam forces are determined capacitively, based on the longitudinal reinforcing bars passing through the beam–column connection. However, this method does not take into account the involvement of the concrete section. Furthermore, this method does not allow the forces transmitted from the beam to the column to be determined on the basis of the applied load. Experimental studies conducted over the past few decades have shown the significant contribution of these two factors, concrete strength and applied load, to the shear force. Analytical solutions of beams of frame construction subjected to different types of loads provide an explanation to the issue of the significant influence of load and strength of concrete [1-2]. In this paper, numerical results obtained from the analytical studies will be shown and conclusions will be drawn supporting experimental observations from the literature.

References:

[1] A. Doicheva, Distribution of Forces in RC Interior Beam–Column Connections, Eng. Proc., 56(1), 114, 2023.

[2] A. Doicheva, Shear Force of Interior Beam–Column Joints under Symmetrical Loading with Two Transverse Forces on the Beam, Buildings, 14(9), 3028, 2024.