Changes in energy costs of post-cyclic deformation of cement composites
https://doi.org/10.21285/2227-2917-2023-1-64-69
Abstract
The paper presents the results of experimental and analytical generalization of energy costs for deformation and destruction of concretes and polypropylene-fibro-reinforced concretes, previously subjected to cyclic loads of various amplitudes and durations. A multicomponent model of costs (work) with regard to the physical regularities of monotonic compression process was proposed, and the ambiguity of their changes in cyclic tests was established. Standard prismatic samples (100 × 100 × 400 mm) of two series in the initial and post-cyclic states were tested: group “A” – N = 200 cycles with amplitude η = 0.6 and group “B” – 50 cycles with η = 0.8. The study involved an original methodology of multifactor automated control of resistance parameters in cyclic mode of different intensity and in post-cyclic resistance under axial compression, which enables the processes of interaction with the external environment to be more adequately modeled and their consequences to be analyzed. The tests were carried out using an ʺInstron-5989ʺ complex with automatic process control within a specially developed program and with records of all monitored parameters conforming to the diagram method for calculating the strength of reinforced concrete elements. Energy indicators proved their high sensitivity and informativity, as well as the possibility to be used for developing functional criteria-based models of low cycle fatigue.
About the Authors
B. I. Pinus
Irkutsk National Research Technical University
Russian Federation
Competing Interests:
Russian Federation
Boris I. Pinus - Dr. Sci. (Eng.), Professor, Professor of the Department of Building Production.
83 Lermontov St., Irkutsk 664074
Competing Interests:
The authors declare no conflict of interests regarding the publication of this article
I. G. Korneeva
Irkutsk National Research Technical University
Russian Federation
Competing Interests:
Russian Federation
Inna G. Korneeva - Cand. Sci. (Eng.), Associate Professor of the Department of Building Production.
83 Lermontov St., Irkutsk 664074
Competing Interests:
The authors declare no conflict of interests regarding the publication of this article
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Review
For citations:
Pinus B.I., Korneeva I.G. Changes in energy costs of post-cyclic deformation of cement composites. Izvestiya vuzov. Investitsii. Stroitelstvo. Nedvizhimost. 2023;13(1):64-69. (In Russ.) https://doi.org/10.21285/2227-2917-2023-1-64-69
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