Modeling of Behavior of the Bending Reinforced Concrete Structures Under Load: Fid-Bau Portal

Modeling of Behavior of the Bending Reinforced Concrete Structures Under Load

Lazouski, D. / Glukhov, D. / Lazouski, Y. / Hil, A.

One of the main differences of reinforced concrete from other materials is the possibility of cracking in concrete, which is not critical in terms of strength and durability; however, it leads to significant change in stiffness along the length of element with cracks. Greatest effect from change in stiffness along the length of element after crack formation is in statically indeterminate elements, where, in accordance with change in stiffness, redistribution of internal forces occurs. State of the issue of analysis of reinforced concrete elements is characterized by the use of mathematical models and different computational tools. So the deformation model of a flat section is used to analyze the moment of cracking and ultimate strength of element; block model of reinforced concrete between cracks to analyze crack’s width and spacing and structural mechanic methods (including finite element method) – to calculate internal forces and deformations. Using these approaches in the structural analysis of stress-strain state of reinforced concrete elements (moving from one method to another), the accumulation of calculation errors invariably occurs, since parameters of the reinforced concrete structure calculated using different approaches have an influence on each other. The purpose of this article is to attempt to combine these approaches for calculating the stress-strain state of reinforced concrete elements at all stages within the single calculation model, avoiding the use of empirical relationships. On an example of the continuous two-span reinforced concrete beam, authors analyzed the proposed analytical model and obtained satisfactory results of convergence with experimental data.