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Non-linear physical relations for reinforced concrete elements under long-term loading

Balevicius R., Simbirkin V.

International Journal of Applied Mechanics and Engineering

2005

Vol. 10, no 1

5-20

The paper presents a method for modelling material non-linearity for use in the analysis of load-carrying capacity and deformations of reinforced concrete beams, columns and membrane-bending plates subjected to long-term loads. Physical relationships expressing relations between internal forces and stresses, strains and stiffness are derived on the basis of the fracture and creep theories for concrete and using non-linear stress-strain diagrams modified for time effects. A specific implementation technique of a genetic algorithm is developed to find multiple solutions to non-smooth problems under consideration. The computation technique proposed is found to be effective in numerical examples, and an adequate accuracy of the analysis is verified by comparison with experimental data.

Numerical analysis of loadbearing systems of multistory buildings

Aliawdin P., Mordich A., Simbirkin V.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no 4

531-541

The paper presents a numerical evaluation of various reinforced concrete structural systems with reference to their response to gravity and wind loads. The structural systems considered are multistory cast-in-place, precast and mixed precast and in-situ skeletons with and without shear walls employed in current building practice. The results of static, dynamic, and stability FE-analyses of such systems are discussed. Cast-in-place and mixed skeletons are shown to be efficient loadbearing systems for multistory residential and office buildings.