Abstract
The present investigation aims to propose a numerical model for assessing the complex damaging response of glass fiber-reinforced polymer- (GFRP-) reinforced concrete columns having hybrid fibers and confined with GFRP spirals (GFHF columns) under concentric and eccentric compression. Fiber-reinforced concrete (FRC) consists of polyvinyl alcohol fibers (PVA) and polypropylene fibers (PF). A total of six GFHF circular columns were constructed having a circular cross section of 250 mm and a height of 1200 mm. A commercial package ABAQUS was used for the finite element analysis (FEA) of the GFHF columns by using a modified concrete damage plastic (CDP) model for hybrid fiber-reinforced concrete (HFRC). The damaging response of GFRP bars was defined using a linear elastic model. The results depicted that the failure of GFHF columns occurred either in the upper or in the lower half portion with the rupture of GFRP longitudinal bars and GFRP spirals. The decrease in the pitch of GFRP spirals led to an improvement in the axial strength (AS) of GFHF columns. The eccentric loading caused a significant reduction in the AS of columns. The comparative study solidly substantiates the validity and applicability of the newly developed FEA models for capturing the AS of GFHF columns by considering the axial involvement of longitudinal GFRP bars and the confinement effect of transverse GFRP spirals. So, the suggested numerical model having a complex system of equations for HFRC can be used for the accurate analysis of HFRC members.
Highlights
Liaqat Ali,1 Ahsan Nawaz,1 Yong Bai,1 Ali Raza,2 Muhammad Kashif Anwar,2 Syyed Adnan Raheel Shah,2 and Syed Safdar Raza3
Glass fiber-reinforced polymer (GFRP) material became the most potential substitute having characteristics like lightweight, low density, high resistance, low thermal conductivity, electromagnetic susceptibility, and, most specially, high resistance to corrosion [1,2,3,4]. ese anisotropic composite materials are generally more effective in aggressive and corrosive conditions, to minimize the running costs while increasing the service life of reinforced concrete [2, 5]. e decrease in the brittleness of plain concrete is the focus of advanced research. erefore, polyvinyl alcohol (PVA) fibers and polypropylene fibers (PF) were added into the concrete in the current work to improve its ductility by reducing the brittleness
Previous studies portrayed that the concrete columns reinforced with steel bars and fibers portrayed increased strength and ductility [6, 7]. ere is a need to investigate the performance of reinforced columns with GFRP bars and hybrid fibers by performing experimentation and numerical simulations which is the main goal of the present work
Summary
Liaqat Ali ,1 Ahsan Nawaz ,1 Yong Bai, Ali Raza, Muhammad Kashif Anwar, Syyed Adnan Raheel Shah, and Syed Safdar Raza. A. Khater e present investigation aims to propose a numerical model for assessing the complex damaging response of glass fiberreinforced polymer- (GFRP-) reinforced concrete columns having hybrid fibers and confined with GFRP spirals (GFHF columns) under concentric and eccentric compression. E comparative study solidly substantiates the validity and applicability of the newly developed FEA models for capturing the AS of GFHF columns by considering the axial involvement of longitudinal GFRP bars and the confinement effect of transverse GFRP spirals. 1. Introduction e tendency of steel subjected to corrosion results in a substantial decrease in the service life of concrete structures made of steel reinforcement by lowering their strength and ductility. E axial and bending strengths were decreased, but column ductility was improved by utilizing the steel reinforcement with an equivalent amount of GFRP bars under various loading conditions [14]. GFRP-RC columns have shown no balance points for the moment due to their linear elastic behavior [10]. e steel and GFRP-RC compression members demonstrated a similar behavior, except that the AS was found to be 7 percent lower for GFRP-RC columns [11]. e laterally confined GFRP-RC columns at a pitch of 76 mm showed the AS of 84 percent of their counterparts in steel-RC columns [12]. e GFRP bars perform well in concrete under compression due to the lower elastic modulus of GFRP bars compared with that of steel bars, and it is beneficial to use GFRP bars in concrete columns [13]. e axial and bending strengths were decreased, but column ductility was improved by utilizing the steel reinforcement with an equivalent amount of GFRP bars under various loading conditions [14]. e ductility of GFRP-RC columns has been improved substantially by decreasing the vertical spacing of stirrups [15,16,17]
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