Abstract
Abstract This paper develops a comparative analysis of the main design models used for predicting the strengthening of reinforced concrete columns subjected to uniaxial compression. The study evaluated four strengthening design models with concrete jackets and eleven strengthening design models with wrapping in Carbon Fiber-Reinforced Polymer (CFRP). All models consider the effect of confinement provided by the transverse steel reinforcement and the CFRP sheet wrapping on the gain in resistance of the column. For the validation, a database was formulated containing 135 experimental results of columns tested by several researches, which was used to analyze all design models and identify which was best for expressing the behavior of the strengthened column. At the end of the study, one confinement design model with transverse reinforcement and eleven design models with confinement provided by CFRP sheet wrapping and transverse steel reinforcement which showed the best resistance predictions were selected.
Highlights
Reinforced concrete structures are designed and built to withstand the stresses imposed throughout their life cycles
This paper develops a comparative analysis of the main design models used for predicting the strengthening of reinforced concrete columns subjected to uniaxial compression
To evaluate strengthening with a concrete jacket, the design models proposed by Cusson and Paultre [2], Saatcioglu and Razvi [3], Frangou et al [4], and the fib Model Code 2010 [5] were used
Summary
Reinforced concrete structures are designed and built to withstand the stresses imposed throughout their life cycles. In the case of constructive defects or accidents, the constructions require retrofitting to improve their structural strength, increase their load capacity, expand their life cycles, or change the function of the building This show the importance of developing adequate strengthening design models for concrete structures to guarantee their technical and economic viability. Among the strengthening techniques for concrete structures, the use of concrete jackets and Carbon Fiber-Reinforced Polymer (CFRP) sheets is highlighted In recent years, these techniques have been heavily used in columns, significantly increasing their load capacity. In the case of strengthening by wrapping with CFRP, the column is surrounded by a composite material formed by carbon fibers filled with epoxy resin Both techniques are effective, and it is necessary to carry out adequate studies of cost, availability of trained labor, and impact on the layout of the building to evaluate the most adequate solution. With regard to strengthening with CFRP sheet wrapping, 11 empirical models available in the literature were evaluated
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