Techno Press

Steel and Composite Structures   Volume 23, Number 1, January20 2017, pages 95-105
Incremental dynamic analyses of concrete buildings reinforced with shape memory alloy
Masoud Mirtaheri, Mehrshad Amini and Hossein Khorshidi

Abstract     [Full Text]
    The use of superelastic shape memory alloys (SMAs) as reinforcements in concrete structures is gradually gaining interest among researchers. Because of different mechanical properties of SMAs compared to the regular steel bars, the use of SMAs as reinforcement in the concrete may change the response of structures under seismic loads. In this study, the effect of SMAs as reinforcement in concrete structures is analytically investigated for 3-, 6- and 8-story reinforced concrete (RC) buildings. For each concrete building, three different reinforcement details are considered: (1) steel reinforcement (Steel) only, (2) SMA bar used in the plastic hinge region of the beams and steel bar in other regions (Steel-SMA), and (3), beams fully reinforced with SMA bar (SMA) and steel bar in other regions. For each case, columns are reinforced with steel bar. Incremental Dynamic Analyses (IDA) are performed using ten different ground motion records to determine the seismic performance of Steel, Steel-SMA and SMA RC buildings. Then fragility curves for each type of RC building by using IDA results for IO, LS and CP performance levels are calculated. Results obtained from the analyses indicate that 3-story frames have approximately the same spectral acceleration corresponding with failure of frames, but in the cases of 6 and 8-story frames, the spectral acceleration is higher in frames equipped with steel reinforcements. Furthermore, the probability of fragility in all frames increases by the building height for all performance levels. Finally, economic evaluation of the three systems are compared.
Key Words
    concrete structures; superelastic shape memory alloys; incremental dynamic analysis; fragility curves
Department of Civil Engineering, K.N.Toosi University of Technology, No. 1346, ValiAsr-Street, Mirdamad Intersection, P.O. Box 15875-4416, Tehran, Iran.

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