System of insufficiency of the modern theory of long-term resistance of reinforced concrete and designers’ warnings

Abstract

Aim of the research. The essence of the failure of the globally widespread theory of long-term resistance of reinforced concrete is defined and analyzed. Methods. This failure includes the following interconnected parts: 1) the set of ten basic fundamental properties of structural concrete is completely distorted (for example, instantaneous linear properties are Maxwell scheme); 2) mathematical rules are violated when recording the rates of elastic deformation and creep deformation, due to a misunderstanding of the Boltzmann principle (these violations distort the whole structure of the theory); 3) the rules of classical mechanics are violated, what is caused by substitution of fundamental properties of concrete with various “chain models” (for example, the principle of independence of action of forces, which is the fourth fundamental law of Galileo - Newton, is violated); 4) sections of the general “world theory of creep of reinforced concrete”, based on its algebraization, in their essence reject the fundamental law of natural science - Newton's second law: not only the inertial component is rejected, but also forces depending on speed (in this way the “world theory of creep of reinforced concrete” is degraded to the level of Aristotle’s mechanics); 5) unacceptably idealized creep theories and structural models that endow concrete with unrealizable properties, especially flagrant in zones of cracks, are incorporated in the normative calculations of structures; 6) solid design companies of the world show that concrete creep is not a scientific theory: this is a warning to designers. Results. The performed analysis is accompanied by necessary mathematical calculations and experimental estimates.

Creep of Concrete in Shell Structures: Nonlinear Theory

“…Practical adaptation requires overcoming existing inconsistencies in the building codes, the calculated position of which is based on an erroneous model of a plastic hinge [ 40 , 41 , 42 ]. In the nonlinear theory of structures, the calculation of structures is presented in a simple and convenient form; it corresponds to the deformation model of the section.…”

General theory and foundations for calculating reinforced concrete structures of buildings and structures in modern construction

“…In the theory (s.5), which is a world theory, the Volterra integral equations representing the creep of concrete with its non-stationary and non-linear properties have fictitious nuclei that violate the envisaged mathematical order of their construction: as a result, concrete forms an erroneous set of fictitious forces that incorrectly form creep deformations [7][8][9][10].…”