The article presents the derivation of the resolving equations for calculating short eccentrically compressed reinforced concrete elements taking into account the creep of concrete. The case of symmetric reinforcement is considered. A viscoelastoplastic model of hereditary aging by A.G. Tamrazyan is used. Comparison of solutions based on linear and nonlinear creep theory is performed.
Investigated the synthesis of polyphenylene sulfide in the environment of an aprotic polar solvent based on p-dichlorobenzene and p-dibromobenzene according to the nature comonomer rating. Infrared spectroscopy and thermogravimetric analysis of the obtained samples are presented.
The determination of the stress-strain state of a polymer cylindrical body causes many difficulties. Due to the fact that the properties of polymers are dependent on a number of factors, including temperature. If there is a change in temperature along the radius during the manufacture of the product and production directly depends on dynamic loads, for example rotation, this factor can fundamentally change the distribution of stresses and strains in the thickness of the investigated structure. The body may develop significant residual stresses that reduce the operational quality of the product. Neglect of this factor can have a catastrophic effect on the reliability of the structure as a whole.
The article presents solutions to the problem of rod buckling, taking into account creep effects. Trigonometric series, the finite difference method in combination with the programming language MATLAB, as well as the finite element method in the ANSYS software package were used in the solutions. The behavior of the rods is researched for two types of relations between strain and stress during creep, with strains in an explicit and implicit form. When solving, the criterion of initial imperfections with their different values is used, as well as the tangential-modular theory. The results obtained for the two creep models are compared. The conclusion is made about the accuracy of the results of calculations in ANSYS with the presence of a combination of geometric and physical nonlinearity for various creep models.
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