Abstract
FRP reinforced polymers are widely accepted for use in civil engineering applications to strengthen constructions and application of confinement on the concrete columns, thereby increasing their ductility and increasing their carrying capacity as these materials are characterized by high tensile strength, high strength-to-weight ratio and high corrosion resistance of FRP composites, etc. In addition, the exposure of reinforced concrete structures to fire is one of the most dangers challenges that lead to great destruction and failure the structural in addition to loss of life. With the development of computer simulation theories to study the behavior of elements and structures under the influence of different loads (static, dynamic, thermal, etc.), it is possible to study the behavior of concrete columns under the influence of axial vertical and non-axial structural loads, and compare the results with previous research, thus saving time, effort and cost instead Of laboratory testing. Strengthening concrete columns with fiber-reinforced polymers (FRP) has been studied extensively, but the majority of published studies have focused on circular columns. Most concrete columns in the field have square or rectangular cross sections and resist eccentric loading as well. The objective of this study is to investigate the performance of square reinforced concrete (RC) columns, wrapped with carbon FRP subjected to fire so, in this paper, an analytical study was conducted using the ANSYS Workbench program, which follows the finite element method, to determine the effect of layers number of CFRP on carrying capacity of concrete columns and to know the effect of external standard fire on confined concrete columns with CFRP. The numerical results were compared with experimental results as far as possible, and revealed the accuracy of the analytical models, when compared to the experimental studies. The results shown that with increase the layer number of CFRP, the carrying capacity of concrete columns will increase, no benefit with increase the number of CFRP more than 4 layers where polymers materials are sensitive to fire so that it needs to insulation. Keywords: confinement, CFRP, External fire, ANSYS Workbench. DOI: 10.7176/CER/12-12-01 Publication date: December 31 st 2020
Highlights
Reinforced concrete is the common material used in structural system in the world
The behavior of these structures and their failure modes are extensively studied The use of fiber reinforced polymer (FRP) composites that are externally applied for strengthening reinforced concrete structures such as beams, slabs and columns has been done experimentally by many researchers and has been applied in construction
FRP systems were first applied to reinforced concrete columns for providing additional confinement in Japan in the 1980s
Summary
Reinforced concrete is the common material used in structural system in the world The behavior of these structures and their failure modes are extensively studied The use of fiber reinforced polymer (FRP) composites that are externally applied for strengthening reinforced concrete structures such as beams, slabs and columns has been done experimentally by many researchers and has been applied in construction. A column is one of the essential elements in civil engineering structures that transmits loads from the upper levels to the lower levels and to the soil through the foundations. During their service life, columns un confinement or confined by CFRP can undergo deterioration caused by, overloading, environmental effects, exposing to exterior deteriorating factors like fire, and other factors. The degradation of concrete strength due to short-term exposure to elevated temperature (fire), has attracted attention in the last decades, where The behavior of concrete exposed to fire depends on its mix composition and determined by complex interactions during heating process, and the modes of concrete failure under fire exposure vary according to the nature of fire, loading system, and type of structure
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