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Structural Engineering and Mechanics
  Volume 63, Number 4, August25 2017, pages 497-507

Seismic response of RC structures rehabilitated with SMA under near-field earthquakes
M.R. Shiravand, A. Khorrami Nejad and M.H. Bayanifar

    During recent earthquakes, a significant number of concrete structures suffered extensive damage. Conventional reinforced concrete structures are designed for life-time safety that may see permanent inelastic deformation after severe earthquakes. Hence, there is a need to utilize adequate materials that have the ability to tolerate large deformation and get back to their original shape. Super-elastic shape memory alloy (SMA) is a smart material with unique properties, such as the ability to regain undeformed shape by unloading or heating. In this research, four different stories (three, five, seven and nine) of reinforced concrete (RC) buildings have been studied and subjected to near-field ground motions. For each building, two different types of reinforcement detailing are considered, including (1) conventional steel reinforcement (RC frame) and (2) steel-SMA reinforcement (SMA RC frame), with SMA bars being used at plastic zones of beams and steel bars in other regions. Nonlinear time history analyses have been performed by \"SeismoStruct\" finite element software. The results indicate that the application of SMA materials in plastic hinge regions of the beams lead to reduction of the residual displacement and consequently post-earthquake repairs. In general, it can be said that shape memory alloy materials reduce structural damage and retrofit costs.
Key Words
    shape memory alloy material; ductility; nonlinear time history analysis; residual lateral displacement; nearfield earthquake; concrete structures
M.R. Shiravand and A. Khorrami Nejad : Department of Civil Engineering, Shahid Beheshti University, Tehran, Iran
M.H. Bayanifar : Department of Civil Engineering, Qazvin Branch of Islamic Azad University, Qazvin, Iran

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