ANALYTICAL MODEL OF THE T- STUB COMPONENT IN THE END-PLATE BOLTED CONNECTION OF THE BEAM TO THE COLUMN IN TENSION

Abstract

End plated connections of metal structures are quite relevant and are usually used in office, commercial, and commercial-office buildings. It is very important to be able to diagnose the real general behavior of beam-to-column connections based on their geometric and mechanical properties. Therefore, the analysis of steel structures at the modern level requires a specialist to have a thorough understanding of their work, as well as the calculation provisions laid down in current design codes. In contrast to Eurocode 3 design codes, the current Ukrainian state building regulations do not contain clear instructions on the beam to column joint calculation and do not even give a clear definition of the concept of steel joint and steel connection. It should be noted that the beam to column connection is the most responsible area that requires special attention, as it significantly affects the design scheme of the structure, as well as its economic efficiency. By using the semi-rigid connection concept, weight savings of up to 20% can be achieved. In the presented article, a simplified mathematical model of the t-stub component of the tensile zone of the semi-rigid bolted connection of the beam to the column was developed using the component method. In the given solution of the connection in the tension zone, the following components were distinguished: the flange in bending, the end of the column in bending, and the bolts in tension. All these elements were modeled from two t- stub components connected through an end plate with the help of bolts. A design scheme for determining the stress-strain state was proposed. The analysis of the exhaustion of the bearing capacity of the t- stub component was performed according to three scenarios depending on the size of its individual elements (end plate thickness, bolt diameter). The obtained results will make it possible to determine the bearing capacity with possible variations of the transition to the limit state, as well as to estimate the deformations of the considered component of the connection. Keywords: end-plate connection, mathematical model, T-stub component, bolt connection.