Superelastic shape memory alloy flag-shaped hysteresis model with sliding response from residual deformation: Experimental and numerical study

Abstract

Superelastic shape memory alloy exhibits flag-shaped hysteresis with self-centering capability. Nevertheless, shape memory alloy undergoes some residual deformation after large plastic strain, especially under repeated cyclic loading. In order to accurately simulate this behavior during nonlinear dynamic time-history analysis, a shape memory alloy flag-shaped hysteresis model with sliding response has been developed. This article shows the gradual development process of this new hysteresis model and provides analysis and verification results to support this claim. A MATLAB-based superelastic uniaxial shape memory alloy material hysteresis model has been developed and was incorporated into a finite element program specifically designed for the piston-based self-centering bracing. This piston-based self-centering bracing system uses superelastic shape memory alloy bars for its energy dissipation and self-centering capability. A proof-of-concept brace specimen was fabricated and tested where numerical and experimental results showed excellent matching. The finite element program was utilized to capture the varying nonlinear quasi-static response of the piston-based self-centering brace. Finally, the piston-based self-centering brace responses from this analysis were used to develop a novel shape memory alloy flag-shaped hysteresis model with sliding response, which was implemented in finite element analysis and design software, S-FRAME. Nonlinear dynamic time-history analysis proves the effectiveness of such bracing in steel frames in reducing interstory drift.

Probabilistic seismic evaluation of SMA‐based self‐centering braced structures considering uncertainty of regional temperature

“…Many SC structural systems have been developed and tested in the past few decades, for example, SC bracing (SCB) system, [9][10][11] SC rocking core system, 12,13 and SC modular panel system, 5,14 which could outperform the conventional structural systems. 11,12,15 Among the possible solutions, a novel class of smart metal called shape memory alloys (SMAs) has been widely considered because of their inherent flag-shaped-like nonlinear superelastic behavior. SMAs possess two well-known characteristics, that is, shape memory effect and superelasticity (SE).…”

“…[4][5][6][7][8] The resilient design strategy aims to achieve rapid recovery of structural integrity and functionality, and self-centering (SC) technology, which can eliminate the permanent deformation with a typical flagshaped hysteretic behavior, has attracted extensive attention. Many SC structural systems have been developed and tested in the past few decades, for example, SC bracing (SCB) system, [9][10][11] SC rocking core system, 12,13 and SC modular panel system, 5,14 which could outperform the conventional structural systems. 11,12,15 Among the possible solutions, a novel class of smart metal called shape memory alloys (SMAs) has been widely considered because of their inherent flag-shaped-like nonlinear superelastic behavior.…”

Seismic performance evaluation of multi-story CBFs equipped with SMA-friction damping braces

“…Taking the friction damping brace (FDB) as an example, which is found good at controlling maximum deformation demand owing to its high damping capacity, but it cannot fully recover deformation (Moreschi and Singh, 2003;Lee et al, 2008;Levy et al, 2000). To minimize the repair effort and to achieve immediate occupancy after earthquakes for structures, the past years have witnessed a fast development of a number of selfcentering (SC) dampers/devices/braces (Christopoulos et al, 2008;Guo et al, 2020;Gur et al, 2019;Haque et al, 2019;Alam, 2019, 2020;Kari et al, 2019;Ozbulut et al, 2011;Zhu, 2017a, 2017b;Shi et al, 2018;Zareie et al, 2020;Zhu et al, 2020).…”

Disturbance observer–based terminal sliding mode control for effective performance of a nonlinear vibration energy harvester

“…During recent years, various control techniques have been applied to maintain specific characteristics and behaviours in nonlinear systems (Nguyen et al, 2018). The sliding mode control (SMC), gained significant attention due to its desirable properties such as robustness against uncertainties, simplicity in implementation and guaranteed stability (Haque et al, 2019; Okubo et al, 2014; Shaw et al, 2011; Xu et al, 2018). In addition, in order to guaranty finite-time convergence of the system, terminal sliding mode control (TSMC) has been developed (Chen et al, 2013).…”