Seismic Performance of Recycled Aggregate Geopolymer Concrete-Filled Double Skin Tubular Columns with Internal Steel and External FRP Tube

Abstract

The large production of cement is resulting in a high-carbon footprint, which is essential to minimize for sustainable concrete construction. Moreover, the large quantity of recycled coarse aggregate (RCA) from the demolition of old concrete structures is creating problems for landfill and disposal. The primary goal of this study is to investigate the seismic efficiency of innovative fiber-reinforced polymer (FRP)-recycled aggregate geopolymer concrete (RAGC) steel-tubed columns (FGSTCs) with an internal steel tube (STT), an external glass-FRP tube (GLT), and RAGC located between the two-tubed components to develop a serviceable structural element. To study their seismic functioning under axial load and lateral repeated load, five FGSTC specimens were manufactured and analyzed under quasi-static loads. The influence of three variables on the performance of FGSTC specimens, consisting of STT reinforcing ratio, compression ratio, and recycled coarse aggregate (RCA) replacement ratio, was investigated in this investigation. The produced specimens’ ductility, hysteretic loops, strain distribution, skeleton curves, stiffness functioning, energy capacity dissipation, damaging functioning, and strength loss were all assessed and discussed. The results of this investigation revealed that percentage substitution of RCA had a minor impact on the seismic functioning of FGSTCs; however, the compression-load ratio depicted a substantial impact. The energy loss of the FGSTCs was 24.5% higher than that of their natural aggregate equivalents. FGSTCs may have a 16.9% lower cumulative failure rate than their natural aggregate counterparts.

Numerical Study on the Axial Compressive Behavior of Steel-Tube-Confined Concrete-Filled Steel Tubes

“…However, shear failure can still be observed in some cases for the CFST and T-C columns, even with RC or SRC infilling [ 13 ]. Besides, external confinement is employed in the form of steel tubes [ 14 , 15 , 16 , 17 , 18 ], fiber reinforced plastic (FRP) tubes [ 19 , 20 ], FRP jackets [ 21 , 22 , 23 , 24 ], FRP rings [ 25 , 26 , 27 , 28 ], or discrete stirrup [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ], which enhances the mechanical properties of the CFST columns to a certain extent.…”

“…Materials 2024, 17, x FOR PEER REVIEW 2 of 28 with RC or SRC infilling [13]. Besides, external confinement is employed in the form of steel tubes [14][15][16][17][18], fiber reinforced plastic (FRP) tubes [19,20], FRP jackets [21][22][23][24], FRP rings [25][26][27][28], or discrete stirrup [29][30][31][32][33][34][35][36], which enhances the mechanical properties of the CFST columns to a certain extent. Apart from that, the newly developed steel-tube-confined CFST (T-CFST) columns have been proven to be effective in improving load-bearing capacity and preventing CFST columns from experiencing shear failure [13,37,38].…”

Strengthening of Variously Shaped Recycled Aggregate Concrete Columns using Ferrocement Confinement

“…Beyond addressing landfill requirements, incorporating recycled coarse aggregate obtained through this process contributes to the creation of environmentally friendly and sustainable infrastructure. Furthermore, it helps curb transportation costs, adding to the overall benefits of this practice [1][2][3][4][5][6][7]. Furthermore, the recycled aggregate concrete presents the improved ductility and sustainable construction for the environment with some deficiency in mechanical strength of concrete structures [8][9][10][11][12].…”