NUMERICAL EXAMPLE OF GRADUAL TRANSFORMATION OF STIFFNESS MATRIX FOR TRIANGULAR FINITE ELEMENT OF DEEP BEAM AND ITS AFE.

The paper considers the numerical example of gradual transformation of the stiffness matrix of triangular finite element of deep beam with the help of stiffness matrix of its additional finite elements. Material FE (concrete) reveals from two (under compression) to four (under tension) physical nonlinear properties before collapse. Initial stiffness matrix changes due to the every one. Therefore two variants of its numerical transformation are considered. Both variants confirm the possibility of realization of the analysis of structures with several nonlinear properties at strength limit stae when the Additional Finite Element Method (AFEM) is used.