NONLINEAR MODELING OF SUPPORTING PERFORATED BEAMS ON COLUMN HEADS

The possibility of using the LIRA-FEM software package for nonlinear modeling of the actual design scheme and actual operation of an I-beam continuous perforated beam at the point of its support on the horizontal column head plate is considered. The finite element library allows modelling the operation of various types of structures with elements of various configurations, as well as use special elements for modeling joints in nodal connections. Nonlinear calculation allows modeling the actual operation of the structure, which takes into account the actual support of the beam on the column; fastening the beam to the column head with bolts; a pre-applied bolt tension force, and a given diagram of the steel operation under static loading. A method for nonlinear calculation of the beam-column system has been developed and the modeling stages are presented, starting with the creation of a new problem and ending with an extended analysis of the results obtained in the design sections and points of the structures. The modeling of the joint operation of a beam with a column is considered in detail, taking into account the real operation of bolts in the connections, depending on their pre-tensioning forces. A task has been formulated for performing nonlinear calculation of perforated metal double-span continuous beams taking into account plastic deformation of the material, which aims to determine the ultimate load and the nature of the loss of stability. In problems of physical and geometric nonlinearity, calculations are performed using iterative and stepwise methods. Nonlinear load modeling was performed, which is an advanced level of structural analysis that allows taking into account the physical or geometric nonlinearity of the behavior of the material or shape of the structure under the action of significant loads. In linear loading, it is assumed that the load is applied gradually and the material responds proportionally. In nonlinear analysis, the material can change its stiffness under the action of the load, plastic deformation occurs in it, and material failure can also be taken into account.