Energy aspects of low cycle fatigue of conventional and fiber reinforced concrete
https://doi.org/10.52170/1815-9265_2024_72_72
Abstract
Fatigue is one of the consequences of the structural degradation of cement-containing composites under non-stationary external influences of various origins. One of the proven ways to increase their fatigue resistance is to modify the structure of fine fibers of materials of high strength and extensibility and physically compatible with the cement matrix. The article analyzes statistically representative experimental data on changes in the damping potential of conventional and fibropolypropylene reinforced concrete under a few cyclic influences, the level of which simulates stress fluctuations in structures under background seismic influences. The results of dynamic tests of prismatic samples with different levels of maximum stresses in the range Ro crc…Rν crc and a zeroasymmetry coefficient are presented. The response of structures is considered as an oscillatory process, the kinetics of which is estimated by the change in the fracture energy under standardized conditions of monotonic loading. The tests were carried out on the Instron 5989 universal test complex in a rigid mode of cyclic and subsequent monotonic compression with a constant deformation rate of 0.04 mm/s up to destruction. An original technique of multifactorial automated control of parameters, time of phased resistance, energy of destruction and other parameters at each cycle of loading and unloading is used. A comparative assessment of the energy potential of concrete and fiber concrete and the kinetics of energy indicators at the stages of cyclic loading is given. The high sensitivity of composites to cyclic effects of the accepted intensity has been established, confirmed by a noticeable decrease in the energy of post-cyclic compression (destruction). The possibility and technical and economic feasibility of strengthening the fatigue resistance of reinforced concrete elements through the introduction of finely dispersed polypropylene fibers has been confirmed.
About the Authors
I. G. Korneeva
Irkutsk National Research Technical University
Russian Federation
Russian Federation
Inna G. Korneeva – Associate Professor of the Building Production Department, Candidaite of Engineering
Irkutsk
B. I. Pinus
Irkutsk National Research Technical University
Russian Federation
Russian Federation
Boris I. Pinus – Professor of the Building Production Department, Doctor of Engineering
Irkutsk
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Review
For citations:
Korneeva I.G., Pinus B.I. Energy aspects of low cycle fatigue of conventional and fiber reinforced concrete. Bulletin of Siberian State University of Transport. 2024;(5):72-79. (In Russ.) https://doi.org/10.52170/1815-9265_2024_72_72
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