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Finite Element Modeling of Confined Concrete with the Shape Memory Alloy: Impact of Winding Pitch and Temperature | ||
| Civil Engineering and Applied Solutions | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 20 مهر 1404 | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22080/ceas.2025.30055.1042 | ||
| نویسندگان | ||
| Mehdi Ghassemieh* ؛ Moein Rezapour | ||
| School of Civil Engineering, College of Engineering, University of Tehran | ||
| تاریخ دریافت: 23 شهریور 1404، تاریخ بازنگری: 19 مهر 1404، تاریخ پذیرش: 19 مهر 1404 | ||
| چکیده | ||
| This study presents a finite element investigation of concrete cylinders confined with shape memory alloy (SMA) windings, focusing on the influence of winding pitch and thermal activation. The nonlinear response was simulated in ABAQUS using the Concrete Damaged Plasticity model for the concrete core and a user-defined FORTRAN subroutine to capture the reversible austenite–martensite transformation and mechanical hysteresis of SMA. A laboratory-tested specimen was first modeled and validated, showing close agreement between numerical and experimental stress–strain curves. Parametric analyses were then conducted for three winding pitches (5.3, 9, and 16 mm) and four temperature levels (30, 50, 70, and 90 °C). Results indicate that decreasing the winding pitch substantially enhances axial strength, post-peak stability, and energy dissipation. Increasing the SMA temperature improves confinement efficiency at large strains while exerting minimal influence on peak strength, reflecting delayed lateral dilation of the concrete core. Stress field analysis confirms that tighter and thermally activated windings produce more uniform stress distribution and reduced mid-core stress loss. Overall, SMA-based active confinement markedly increases ductility and energy absorption capacity, demonstrating its potential for seismic strengthening and impact-resistant applications. | ||
| کلیدواژه‌ها | ||
| Shape memory alloy؛ Concrete confinement؛ Finite element modeling؛ Energy dissipation؛ ABAQUS | ||
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