Variation of Shear Force in RC internal Beam-Column Connection from concentrated Moments on a frame Beam

One of the most vulnerable elements from frame structures under seismic effects is the beam-column connection. Damage occurs as a result of the shear force in the connection. The definition of shear force was given by Hanson and Connor in 1967. It leads to the freedom of researchers to search for those parameters that influence the magnitude of the shear force. Research in different countries has not led to the establishment of a uniform procedure in the codes. One reason is the difficulty in calculating the forces that are transmitted from the beams to the columns. In the current Eurocode 2, the shear force is defined capacitively. This paper considers a mathematical model of the beam which allows all dimensions of the beam in height, as well as the characteristics of the composite beam materials to be taken into account. In the present study, a beam of a frame structure loaded with concentrated moments is considered. A solution is performed and the equations for the support reactions along the lateral edge in height of the beam are derived. Solutions for symmetric cross sections are shown. Numerical results for selected beam sizes are demonstrated. They are compared with the results of formulas recommended in the literature. Comparison of the new shear force with that determined by the approximate method recommended in the literature shows a difference of 27%. A comparison was also made with the shear force determined according to Eurocode 2. The result showed a difference of 22%.