Abstract
This paper presents the results of experimental investigations of compressed concrete elements behaviour subjected to monotonic and cyclic load strengthened with CFRP materials. Two types of CFRP strengthening were applied during the experiment – longitudinal strips and/or transverse sheets. The results obtained allowed to draw conclusions concerning the possibility of representing a stress-strain monotonic curve with a curve of cyclic strains. The influence of load history on strain parameters of the investigated elements was found. The influence of the strengthening pattern and the state of effort on Young modulus and residual strains was analyzed. Moreover, observations were made of the disadvantageous effect of cyclic loads on strengthening durability, which lead to deformation or partial delamination of external CFRP reinforcement.
Highlights
Wide popularization of FRP systems and dynamic development of knowledge in the area of possible applications for this technology allowed to apply them for strengthening elements subjected to cyclic loads
This paper presents the results of a recent experimental study on the behavior of CFRP-confined concrete under cyclic compression
Based on completed experimental studies and results of analyses, the authors have drawn the following conclusions: 1. The effectiveness of CFRP strengthening for concrete elements subjected to cyclic compression depends on the state of effort of concrete and predominantly the interaction of both materials
Summary
Wide popularization of FRP systems and dynamic development of knowledge in the area of possible applications for this technology allowed to apply them for strengthening elements subjected to cyclic loads. The latest findings show that application of FRP confinement in columns causes an increase of their load-bearing capacity It stems from limitation of strains in the concrete core. Extensive studies conducted upon plain and reinforced concrete specimens under monotonic loads are generally known They underlie the σ-ε models of FRP strengthened concrete. Ozbakkaloglu et al (2008) raised the issue of cyclic loads on cylindrical specimens out of HSC – highstrength concrete and NSC – normal-strength concrete, strengthened with FRP composites. Wrapping a column with continuous CFRP jacket makes the observation of a confined concrete core impossible It leads to loss of control over the heavily exerted element, gradually penetrated by internal microdamages leading to brittle destruction. The leitmotif of the studies conducted is the influence of longitudinal and transverse CFRP strengthening on the state of effort of compressed elements
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