Influence of the Loading Rate on the Axial Compressive Behavior of Concrete Specimens Confined With Srg Jackets

Abstract eng:
In the present paper, an experimental study was carried out where the main objective was to investigate the favorable confinement characteristics of steel reinforced grout (SRG) jackets on the compressive behavior of unreinforced concrete prisms under monotonic and cyclic axial loading. SRG jackets were made by applying steel fiber reinforced fabrics of reduced density combined with cementitious grout that serves as the connecting matrix. For this purpose, one layer of the novel jacketing system was applied to a number of unreinforced concrete prismatic specimens constructed for a moderate concrete cylindrical compressive strength of 25 MPa. The parameters of this investigation were: a) the density of the fabric used in the steel reinforced concrete jackets and b) the rate of axial loading. The density of the fabric was either medium (2 cords/cm) or relatively low (1 cord/cm). The specimens were subjected to monotonic concentric uni-axial compression load applied either in a slow rate reaching the maximum load in 400 secs or at a axial load rate ten times faster. Both the slow rate load and the fast rate load were applied in the following manner. Initially, approximately 50% of the maximum load was reached in 3 load-unload cycles that were followed by 3 loadunload cycles at approximately 75% of the maximum load before the specimen reached the maximum load and failure at a final loading cycle. The experimental sequence was carried out at the Laboratory of Strength of Materials and Structures of Aristotle University of Thessaloniki. The magnitude of the maximum load reached, as well as the mode of failure attained at the end of each loading sequence was monitored. From the obtained results, the influence of the loading rate on the ultimate compressive load and on the mode of failure in relation to the SRG jacket characteristics was studied. The whole effort intended to examine the effect on the response behavior of SRG jacketed specimens when axial load is dynamic in nature.

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