A study on the seismic behavior of Shape Memory Alloy (SMA) reinforced low-rise and mid-rise concrete frames

Mathew, Reshma Mary (2023) A study on the seismic behavior of Shape Memory Alloy (SMA) reinforced low-rise and mid-rise concrete frames. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Earthquakes have created greater drift demands mainly residual drift demands on reinforced concrete (RC) structures. Higher residual drift demands result in permanent deformation, which poses unfavorable conditions for the occupants of building. The rupture distance of an earthquake plays a crucial role in the seismic performance of structures. Previous researches have explored methods like base isolation and seismic dampers to enhance post-earthquake functionality, but their maintenance and repair requirements have redirected attention to smart alloys such as shape memory alloys (SMA). These alloys possess unique properties like super elasticity and shape memory effect, enabling them to recover their original shape after unloading and exhibit high recovery strains of approximately 7%. The objective of this study is to mitigate residual drift demands in RC structures by utilizing SMA as reinforcement within the plastic hinge length. The effectiveness of this approach is compared under near fault and far fault ground motions, considering both low-rise and mid-rise RC frames. The findings reveal that SMA demonstrates a significant improvement in reducing residual drift demands in RC frames subjected to near fault ground motions compared to far fault ground motions.

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