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Predictive model for confinement pressure of partially FRP confined concrete columns
Major Topic: Concrete Structures|سازه های بتنی
Abstract
Nowadays, application of FRP wraps is a common approach for strengthening concrete components, especially columns due to its advantageous mechanical properties. Various relationships have been proposed to determine the compressive strength of FRP confined concrete by various researchers, taking advantage of the confinement pressure which is related to the FRP wraps characteristics and the geometric aspects of column. It should be noted that in some cases partial confinement is used due to some reasons. Therefore, the confinement pressure caused by the FRP wraps differs with the case of continues confinement. This is because of non-uniform distribution of confinement pressure between the wraps. Therefore, modified relations for confinement pressure are required in order to utilize the available models of compressive confined strength which are mostly proposed for continues FRP wraps. In recent years, researchers have proposed different relationships for the effective confinement pressure in the concrete core of partially confined circular and square columns. Comparison of the attained results by these relations with the experimental outcomes showed that these corrective relations can provide accurate estimations. Accordingly, in the present study, the authors try to propose a new and more accurate model for the confinement pressure of partially confined circular and square columns using experimental results and the Multi-Expression Programming (MEP). Then, the suggested relation is used in conjunction with some of the best-performing available models for confined compressive strength for performance evaluation. The obtained results indicate acceptable accuracy of the suggested formulae.
Keywords
Confinement pressure; FRP; Partial confinement; Compressive strength; Circular section; Square section