Civil Engineering Association

Seismic performance of concrete frame structures reinforced with superelastic shape memory alloys

Abstract. Superelastic Shape Memory Alloys (SMAs) are gaining acceptance for use as reinforcing bars in
concrete structures. The seismic behaviour of concrete frames reinforced with SMAs is being assessed in this
study. Two eight-storey concrete frames, one of which is reinforced with regular steel and the other with SMAs at
the plastic hinge regions of beams and regular steel elsewhere, are designed and analyzed using 10 different
ground motion records. Both frames are located in the highly seismic region of Western Canada and are designed
and detailed according to current seismic design standards. The validation of a finite element (FE) program that
was conducted previously at the element level is extended to the structure level in this paper using the results of a
shake table test of a three-storey moment resisting steel RC frame. The ten accelerograms that are chosen for
analyzing the designed RC frames are scaled based on the spectral ordinate at the fundamental periods of the
frames. The behaviour of both frames under scaled seismic excitations is compared in terms of maximum interstorey
drift, top-storey drift, inter-storey residual drift, and residual top-storey drift. The results show that SMA-
RC frames are able to recover most of its post-yield deformation, even after a strong earthquake.

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