Influence of the Shape Memory Alloys on Concrete Shear Wall withEccentric Openings

Seismic loading is crucial in seismically vulnerable nations, and neglecting it can result incatastrophic harm to both structural and non-structural components. Columns, beams, and walls willgrow in size and weight due to employing a structure's elastic ability to dissipate seismic energy, whichwill also raise the cost of construction. Shear walls are frequently employed due to their effectivebehavior under seismic loads and a strong capacity for energy dissipation. Sometimes, it is unavoidableto prevent openings in shear walls for architectural reasons. Due to load concentration in the vicinity ofvoids, providing sufficient ductility in these shear walls is challenging. Plastic deformations render theconstructions unusable, which is another issue with shear walls. Researchers are paying more and moreattention to the use of shape memory alloys (SMA) as reinforcing bars in concrete buildings. This studyaims to assess the effectiveness of using superelastic Nitinol (NiTi) and Fe-based (FeMnAlNi) SMAsin a concrete shear wall to reduce residual displacement. One shear wall model without SMA wascreated with OpenSees finite element software to verify this analysis's integrity. Secondly, the steelrebar was partially replaced with different types of SMA in critical locations. Results indicated thatutilization of superelastic alloys would result in a significant reduction of residual displacement.Additionally, a slight change in the shear wall's dissipated energy is observed compared to the shearwalls without SMA.

Keywords:

Shape memory alloys , Superelastisity , Finite Element Method , Reinforced concrete shear wall , self-centering.