The simulation of compliance of structural joints in the calculation of multi-story frame buildings

Abstract

Multi-story frame buildings in precast concrete are one of the main types of buildings being built in the country. The article considers and analyzes the results of the numerical calculation of the structural system of a multi-story frame building, made using the LIRA-SAPR software package. It has been shown that with a semi-rigid assembly of the crossbars with columns it is necessary and possible to simulate the compliance of the joints. The ratio of bending moments in spans and on supports in the crossbars of the calculation scheme depends on the coefficient of compliance (rigidity) of the joints. In its turn, the compliance of semi-rigid joints is a complex quantity, determined by the compliance of the structural elements of the joints, namely: the compliance of the embedded parts in the joined elements of the frame, the compliance of the connecting cover plate, the compliance of the welds for the connecting cover plate, as well as the compliance of the seam between the crossbar and a column filled with cement-sand mortar. An algorithm for determining the compliance of structural elements of a semi-rigid joint is given.