Abstract
Loading rates affect the behavior of concrete specimens from the beginning of the loading process until failure. At rather high loading rates, longitudinal deformations in concrete specimens under a compressive load are practically elastic up until the ultimate limit state. It has been previously demonstrated that transverse deformations effectively indicate high-strength concrete behavior in the entire static loading process range. A theoretical model for cylindrical concrete specimen failure under compressive load, based on a structural phenomenon, has also been proposed. The aim of the present research is experimental verification of using transverse deformations in addition to longitudinal ones for investigating high-strength concrete behavior at the non-elastic stage. This research is based on testing normal-strength concrete cylindrical specimens under compression at relatively high loading rates. The theoretical model of the cracking and failure scheme of the cylindrical specimens are experimentally confirmed. The obtained results demonstrate that it is possible to use transverse deformations for the interpretation of initiation and development of inelastic deformations in high-strength concrete up to class C90 based on the data for normal-strength concrete specimens of class C30 subjected to relatively high loading rates.
Highlights
The transverse deformation analysis of structures is usually limited to obtaining Poisson’s ratio, which is only applicable to the range of elastic concrete behavior
It should be mentioned that this possibility becomes available when the transverse deformations exceed the Poisson’s ratio validity range, i.e., after the initiation of longitudinal cracks, when ε trans > ε ct ul
It should be mentioned that this possibility becomes available when the transverse deformations exceed the Poisson’s ratio validity range, i.e., after the initiation of longitudinal cracks, when ε ε
Summary
The transverse deformation analysis of structures is usually limited to obtaining Poisson’s ratio, which is only applicable to the range of elastic concrete behavior. For compression, this range can reach half of the concrete strength. The elastic compressed concrete stage is an essential part of concrete behavior investigations [1]. According to modern design codes, the elastic stage is limited to about 40% of its strength [2,3]. Further concrete behavior is characterized by elastic–plastic deformations, which can be graphically represented by a convex square parabola relative to the deformation’s axis. If instead of a square parabola, a sinusoidal approximation is used, the difference in potential energy is about 7% [4]
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