Numerical Investigation for the Structural Behaviour of Different Strengthening Techniques for Partially-Loaded Square Self-Compacted Concrete Short Columns

Abstract This paper aims to study numerically the structural behaviour of partially loaded square SCC short columns strengthening with various techniques such as near-surface mounted with steel reinforcement bars (NSM), CFRP wrapping, and both of them (hybrid technique). For this purpose, the results of the ultimate strengths and complete load-deflection response of strengthened columns investigated experimentally in an underpublishing paper were used to verify the accuracy of the computational results. Additional parameters were examined throughly the numerical work, such as the effect of extra CFRP layers, the effect of various compressive strengths, the effect of changing initial loading ratios, and the effect of various numbers of CFRP strips. Results showed that the numerical investigation recorded an excellent agreement with the experimental work through the convergence in the value of both the ultimate load and maximum displacement. Furthermore, increasing the layers of CFRP laminate was active in the specimens strengthened with full CFRP wrapping and hybrid one. The same effect occurred as the compressive strength of the column increased. Rising the loading ratio caused a decrease in the strength capacity for the columns. In contrast, decreasing the spacing between two successive laminates increased the ultimate load capacity for the specimens enhanced partially wrapping with CFRP laminate.