Abstract
Abstract Severe permanent deformations of buildings during earthquakes have been found as one of the major causes of the instability and failure of structures. The application of superelastic Shape Memory Alloy rebars at the plastic hinge region of reinforced concrete beam-column joints (SESMA-BCJs) can eliminate the seismic residual deformations. Such self-centering structures can maintain their reusability even after severe earthquakes. This research proposes a simple - yet practical - technique for more accurate modeling of SESMA-BCJs using VecTor2 software. Both material and geometric nonlinearity were considered. Efficiency and versatility of the modeling approach were verified against a number of test results at both material and structural levels. According to the results, the adopted modeling approach can be reliably used for the prediction of the cyclic response of hybrid SESMA-BCJs under changing various design parameters which are beyond the scope of the experimental tests. Furthermore, using the calibrated model, a comprehensive seismic parametric study was conducted to investigate the influence of various design parameters on the seismic performance of SESMA-BCJs. Finally, a new Fe-based SESMA-BCJ with a lower amount of SESMA and higher seismic performance than NiTi-based BCJs was introduced and numerically investigated.
Highlights
Severe residual deformations of buildings and bridges during earthquakes have been found as one of the major causes of instability and failure of structures (Alam et al, 2007)
“self-centering” structures with the ability to return to the initial position have been considered by some researchers
The aim was to find a suitable alternative for Ni55Ti45 bars, leading to decreasing the number and size of the required superelastic Shape Memory Alloy (SESMA) bars and enhancing the seismic performance of hybrid SMA-steel BCJs
Summary
Severe residual deformations of buildings and bridges during earthquakes have been found as one of the major causes of instability and failure of structures (Alam et al, 2007). As an alternative and simple technique toward construction of self-centering RC structures, superelastic Shape Memory Alloy (SESMA) can be used as the flexural reinforcement in the plastic hinge region of monolithic beam-column joints. These hybrid SMA-steel BCJs can potentially regain their original shape even after a severe earthquake (Alam et al, 2007). Proposing an approach for reducing the amount of required SESMA and enhancing the seismic performance of hybrid SMA-steel beam-column joints, and investigating its efficacy through a numerical study
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